<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodStartLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodStartLabel" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/netLabel" xlink:href="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd#netLabel" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedNetLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedNetLabel" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTerseLabel" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodEndLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodEndLabel" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTotalLabel" xlink:type="simple" />
  <link:labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
    <link:label id="lab_us-gaap_StatementOfFinancialPositionAbstract_672D5128D18D67727583602EC0B729D7_label_en-US" xlink:label="lab_us-gaap_StatementOfFinancialPositionAbstract_672D5128D18D67727583602EC0B729D7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Financial Position [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="loc_us-gaap_StatementOfFinancialPositionAbstract_672D5128D18D67727583602EC0B729D7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_672D5128D18D67727583602EC0B729D7" xlink:to="lab_us-gaap_StatementOfFinancialPositionAbstract_672D5128D18D67727583602EC0B729D7" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommonStockParOrStatedValuePerShare_E76F3C6286479FA49BA6602EC0B7A4E7_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockParOrStatedValuePerShare_E76F3C6286479FA49BA6602EC0B7A4E7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common stock, par value (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_CommonStockParOrStatedValuePerShare_E76F3C6286479FA49BA6602EC0B7A4E7_label_en-US" xlink:label="lab_us-gaap_CommonStockParOrStatedValuePerShare_E76F3C6286479FA49BA6602EC0B7A4E7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock, Par or Stated Value Per Share</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_E76F3C6286479FA49BA6602EC0B7A4E7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockParOrStatedValuePerShare_E76F3C6286479FA49BA6602EC0B7A4E7" xlink:to="lab_us-gaap_CommonStockParOrStatedValuePerShare_E76F3C6286479FA49BA6602EC0B7A4E7" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommonStockSharesAuthorized_390C5710A9CA4D3C49D3602EC0B7075E_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesAuthorized_390C5710A9CA4D3C49D3602EC0B7075E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common stock, shares authorized (in shares)</link:label>
    <link:label id="lab_us-gaap_CommonStockSharesAuthorized_390C5710A9CA4D3C49D3602EC0B7075E_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesAuthorized_390C5710A9CA4D3C49D3602EC0B7075E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock, Shares Authorized</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_390C5710A9CA4D3C49D3602EC0B7075E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockSharesAuthorized_390C5710A9CA4D3C49D3602EC0B7075E" xlink:to="lab_us-gaap_CommonStockSharesAuthorized_390C5710A9CA4D3C49D3602EC0B7075E" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommonStockSharesIssued_7B18C9F07A697E4001FF602EC0B708FB_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesIssued_7B18C9F07A697E4001FF602EC0B708FB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common stock, shares issued (in shares)</link:label>
    <link:label id="lab_us-gaap_CommonStockSharesIssued_7B18C9F07A697E4001FF602EC0B708FB_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesIssued_7B18C9F07A697E4001FF602EC0B708FB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock, Shares, Issued</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaap_CommonStockSharesIssued_7B18C9F07A697E4001FF602EC0B708FB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockSharesIssued_7B18C9F07A697E4001FF602EC0B708FB" xlink:to="lab_us-gaap_CommonStockSharesIssued_7B18C9F07A697E4001FF602EC0B708FB" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommonStockSharesOutstanding_77557F1841AEBADD5EF3602EC0B76C6B_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding_77557F1841AEBADD5EF3602EC0B76C6B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common stock, shares outstanding (in shares)</link:label>
    <link:label id="lab_us-gaap_CommonStockSharesOutstanding_77557F1841AEBADD5EF3602EC0B76C6B_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding_77557F1841AEBADD5EF3602EC0B76C6B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock, Shares, Outstanding</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_77557F1841AEBADD5EF3602EC0B76C6B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockSharesOutstanding_77557F1841AEBADD5EF3602EC0B76C6B" xlink:to="lab_us-gaap_CommonStockSharesOutstanding_77557F1841AEBADD5EF3602EC0B76C6B" xlink:type="arc" />
    <link:label id="lab_us-gaap_TreasuryStockShares_76BC3A0447B7283D178F602EC0B79106_verboseLabel_en-US" xlink:label="lab_us-gaap_TreasuryStockShares_76BC3A0447B7283D178F602EC0B79106" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Treasury stock, shares (in shares)</link:label>
    <link:label id="lab_us-gaap_TreasuryStockShares_76BC3A0447B7283D178F602EC0B79106_label_en-US" xlink:label="lab_us-gaap_TreasuryStockShares_76BC3A0447B7283D178F602EC0B79106" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Treasury Stock, Shares</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TreasuryStockShares" xlink:label="loc_us-gaap_TreasuryStockShares_76BC3A0447B7283D178F602EC0B79106" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TreasuryStockShares_76BC3A0447B7283D178F602EC0B79106" xlink:to="lab_us-gaap_TreasuryStockShares_76BC3A0447B7283D178F602EC0B79106" xlink:type="arc" />
    <link:label id="lab_us-gaap_RevenueFromContractWithCustomerAbstract_9AB771DCDF36D77B575F7A57D6092846_label_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerAbstract_9AB771DCDF36D77B575F7A57D6092846" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue from Contract with Customer [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueFromContractWithCustomerAbstract" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerAbstract_9AB771DCDF36D77B575F7A57D6092846" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerAbstract_9AB771DCDF36D77B575F7A57D6092846" xlink:to="lab_us-gaap_RevenueFromContractWithCustomerAbstract_9AB771DCDF36D77B575F7A57D6092846" xlink:type="arc" />
    <link:label id="lab_us-gaap_DisaggregationOfRevenueTable_A073081386782C849FDD7A57D6096870_terseLabel_en-US" xlink:label="lab_us-gaap_DisaggregationOfRevenueTable_A073081386782C849FDD7A57D6096870" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disaggregation of Revenue [Table]</link:label>
    <link:label id="lab_us-gaap_DisaggregationOfRevenueTable_A073081386782C849FDD7A57D6096870_label_en-US" xlink:label="lab_us-gaap_DisaggregationOfRevenueTable_A073081386782C849FDD7A57D6096870" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disaggregation of Revenue [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisaggregationOfRevenueTable" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_A073081386782C849FDD7A57D6096870" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_A073081386782C849FDD7A57D6096870" xlink:to="lab_us-gaap_DisaggregationOfRevenueTable_A073081386782C849FDD7A57D6096870" xlink:type="arc" />
    <link:label id="lab_us-gaap_StatementBusinessSegmentsAxis_95E7476785FC9500A1867A57D6096657_terseLabel_en-US" xlink:label="lab_us-gaap_StatementBusinessSegmentsAxis_95E7476785FC9500A1867A57D6096657" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Segments [Axis]</link:label>
    <link:label id="lab_us-gaap_StatementBusinessSegmentsAxis_95E7476785FC9500A1867A57D6096657_label_en-US" xlink:label="lab_us-gaap_StatementBusinessSegmentsAxis_95E7476785FC9500A1867A57D6096657" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segments [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_95E7476785FC9500A1867A57D6096657" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_95E7476785FC9500A1867A57D6096657" xlink:to="lab_us-gaap_StatementBusinessSegmentsAxis_95E7476785FC9500A1867A57D6096657" xlink:type="arc" />
    <link:label id="lab_us-gaap_SegmentDomain_734361E03D1FD33A38E27A57D60AD5A2_terseLabel_en-US" xlink:label="lab_us-gaap_SegmentDomain_734361E03D1FD33A38E27A57D60AD5A2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Segments [Domain]</link:label>
    <link:label id="lab_us-gaap_SegmentDomain_734361E03D1FD33A38E27A57D60AD5A2_label_en-US" xlink:label="lab_us-gaap_SegmentDomain_734361E03D1FD33A38E27A57D60AD5A2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segments [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_734361E03D1FD33A38E27A57D60AD5A2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SegmentDomain_734361E03D1FD33A38E27A57D60AD5A2" xlink:to="lab_us-gaap_SegmentDomain_734361E03D1FD33A38E27A57D60AD5A2" xlink:type="arc" />
    <link:label id="lab_oas_ExplorationAndProductionMember_692D3971EB683893EEC47A57D60A3D68_terseLabel_en-US" xlink:label="lab_oas_ExplorationAndProductionMember_692D3971EB683893EEC47A57D60A3D68" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exploration and Production</link:label>
    <link:label id="lab_oas_ExplorationAndProductionMember_692D3971EB683893EEC47A57D60A3D68_label_en-US" xlink:label="lab_oas_ExplorationAndProductionMember_692D3971EB683893EEC47A57D60A3D68" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Exploration And Production [Member]</link:label>
    <link:label id="lab_oas_ExplorationAndProductionMember_692D3971EB683893EEC47A57D60A3D68_documentation_en-US" xlink:label="lab_oas_ExplorationAndProductionMember_692D3971EB683893EEC47A57D60A3D68" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Exploration And Production [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_ExplorationAndProductionMember" xlink:label="loc_oas_ExplorationAndProductionMember_692D3971EB683893EEC47A57D60A3D68" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_ExplorationAndProductionMember_692D3971EB683893EEC47A57D60A3D68" xlink:to="lab_oas_ExplorationAndProductionMember_692D3971EB683893EEC47A57D60A3D68" xlink:type="arc" />
    <link:label id="lab_oas_MidstreamServicesMember_D68E4A7B89A1E81A3CF27A57D60B62D8_terseLabel_en-US" xlink:label="lab_oas_MidstreamServicesMember_D68E4A7B89A1E81A3CF27A57D60B62D8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Midstream Services</link:label>
    <link:label id="lab_oas_MidstreamServicesMember_D68E4A7B89A1E81A3CF27A57D60B62D8_label_en-US" xlink:label="lab_oas_MidstreamServicesMember_D68E4A7B89A1E81A3CF27A57D60B62D8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Midstream Services [Member]</link:label>
    <link:label id="lab_oas_MidstreamServicesMember_D68E4A7B89A1E81A3CF27A57D60B62D8_documentation_en-US" xlink:label="lab_oas_MidstreamServicesMember_D68E4A7B89A1E81A3CF27A57D60B62D8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Midstream Services [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_MidstreamServicesMember" xlink:label="loc_oas_MidstreamServicesMember_D68E4A7B89A1E81A3CF27A57D60B62D8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_MidstreamServicesMember_D68E4A7B89A1E81A3CF27A57D60B62D8" xlink:to="lab_oas_MidstreamServicesMember_D68E4A7B89A1E81A3CF27A57D60B62D8" xlink:type="arc" />
    <link:label id="lab_oas_WellServicingMember_010EBC49E1BCFEC3D6997A57D60B1577_terseLabel_en-US" xlink:label="lab_oas_WellServicingMember_010EBC49E1BCFEC3D6997A57D60B1577" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Well Services</link:label>
    <link:label id="lab_oas_WellServicingMember_010EBC49E1BCFEC3D6997A57D60B1577_label_en-US" xlink:label="lab_oas_WellServicingMember_010EBC49E1BCFEC3D6997A57D60B1577" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Well Servicing [Member]</link:label>
    <link:label id="lab_oas_WellServicingMember_010EBC49E1BCFEC3D6997A57D60B1577_documentation_en-US" xlink:label="lab_oas_WellServicingMember_010EBC49E1BCFEC3D6997A57D60B1577" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Well Servicing [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_WellServicingMember" xlink:label="loc_oas_WellServicingMember_010EBC49E1BCFEC3D6997A57D60B1577" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_WellServicingMember_010EBC49E1BCFEC3D6997A57D60B1577" xlink:to="lab_oas_WellServicingMember_010EBC49E1BCFEC3D6997A57D60B1577" xlink:type="arc" />
    <link:label id="lab_us-gaap_DisaggregationOfRevenueLineItems_8B23A8B92E5CE963D2167A57D60B692E_terseLabel_en-US" xlink:label="lab_us-gaap_DisaggregationOfRevenueLineItems_8B23A8B92E5CE963D2167A57D60B692E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disaggregation of Revenue [Line Items]</link:label>
    <link:label id="lab_us-gaap_DisaggregationOfRevenueLineItems_8B23A8B92E5CE963D2167A57D60B692E_label_en-US" xlink:label="lab_us-gaap_DisaggregationOfRevenueLineItems_8B23A8B92E5CE963D2167A57D60B692E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disaggregation of Revenue [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_8B23A8B92E5CE963D2167A57D60B692E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_8B23A8B92E5CE963D2167A57D60B692E" xlink:to="lab_us-gaap_DisaggregationOfRevenueLineItems_8B23A8B92E5CE963D2167A57D60B692E" xlink:type="arc" />
    <link:label id="lab_us-gaap_DisaggregationOfRevenueTableTextBlock_069122A856B0C85911B17A57D60B50AA_terseLabel_en-US" xlink:label="lab_us-gaap_DisaggregationOfRevenueTableTextBlock_069122A856B0C85911B17A57D60B50AA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disaggregation of Revenue</link:label>
    <link:label id="lab_us-gaap_DisaggregationOfRevenueTableTextBlock_069122A856B0C85911B17A57D60B50AA_label_en-US" xlink:label="lab_us-gaap_DisaggregationOfRevenueTableTextBlock_069122A856B0C85911B17A57D60B50AA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disaggregation of Revenue [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisaggregationOfRevenueTableTextBlock" xlink:label="loc_us-gaap_DisaggregationOfRevenueTableTextBlock_069122A856B0C85911B17A57D60B50AA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisaggregationOfRevenueTableTextBlock_069122A856B0C85911B17A57D60B50AA" xlink:to="lab_us-gaap_DisaggregationOfRevenueTableTextBlock_069122A856B0C85911B17A57D60B50AA" xlink:type="arc" />
    <link:label id="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock_52E01FE40CA3775AE4B07A57D60CAF91_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock_52E01FE40CA3775AE4B07A57D60CAF91" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Remaining Performance Obligation Expected Satisfaction Period</link:label>
    <link:label id="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock_52E01FE40CA3775AE4B07A57D60CAF91_label_en-US" xlink:label="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock_52E01FE40CA3775AE4B07A57D60CAF91" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock_52E01FE40CA3775AE4B07A57D60CAF91" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock_52E01FE40CA3775AE4B07A57D60CAF91" xlink:to="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock_52E01FE40CA3775AE4B07A57D60CAF91" xlink:type="arc" />
    <link:label id="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_7F4D50099AFBE2C691A479D0511E12B8_label_en-US" xlink:label="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_7F4D50099AFBE2C691A479D0511E12B8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Organization, Consolidation and Presentation of Financial Statements [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_7F4D50099AFBE2C691A479D0511E12B8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_7F4D50099AFBE2C691A479D0511E12B8" xlink:to="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_7F4D50099AFBE2C691A479D0511E12B8" xlink:type="arc" />
    <link:label id="lab_srt_CondensedFinancialStatementsTextBlock_EBDC07B022F28A7057A879D0511FCD3A_terseLabel_en-US" xlink:label="lab_srt_CondensedFinancialStatementsTextBlock_EBDC07B022F28A7057A879D0511FCD3A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Condensed Consolidating Financial Information</link:label>
    <link:label id="lab_srt_CondensedFinancialStatementsTextBlock_EBDC07B022F28A7057A879D0511FCD3A_label_en-US" xlink:label="lab_srt_CondensedFinancialStatementsTextBlock_EBDC07B022F28A7057A879D0511FCD3A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Condensed Financial Statements [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_CondensedFinancialStatementsTextBlock" xlink:label="loc_srt_CondensedFinancialStatementsTextBlock_EBDC07B022F28A7057A879D0511FCD3A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_CondensedFinancialStatementsTextBlock_EBDC07B022F28A7057A879D0511FCD3A" xlink:to="lab_srt_CondensedFinancialStatementsTextBlock_EBDC07B022F28A7057A879D0511FCD3A" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_4A0AE11788BB3F4BEBC38E86D3DB126D_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_4A0AE11788BB3F4BEBC38E86D3DB126D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commitments and Contingencies Disclosure [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_4A0AE11788BB3F4BEBC38E86D3DB126D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_4A0AE11788BB3F4BEBC38E86D3DB126D" xlink:to="lab_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_4A0AE11788BB3F4BEBC38E86D3DB126D" xlink:type="arc" />
    <link:label id="lab_us-gaap_LossContingenciesTable_EA9174EE2737944977A78E86D3DCEA2C_terseLabel_en-US" xlink:label="lab_us-gaap_LossContingenciesTable_EA9174EE2737944977A78E86D3DCEA2C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loss Contingencies [Table]</link:label>
    <link:label id="lab_us-gaap_LossContingenciesTable_EA9174EE2737944977A78E86D3DCEA2C_label_en-US" xlink:label="lab_us-gaap_LossContingenciesTable_EA9174EE2737944977A78E86D3DCEA2C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loss Contingencies [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LossContingenciesTable" xlink:label="loc_us-gaap_LossContingenciesTable_EA9174EE2737944977A78E86D3DCEA2C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LossContingenciesTable_EA9174EE2737944977A78E86D3DCEA2C" xlink:to="lab_us-gaap_LossContingenciesTable_EA9174EE2737944977A78E86D3DCEA2C" xlink:type="arc" />
    <link:label id="lab_us-gaap_SubsequentEventTypeAxis_87583FBCFDB6C8EFAA278E86D3DC7050_terseLabel_en-US" xlink:label="lab_us-gaap_SubsequentEventTypeAxis_87583FBCFDB6C8EFAA278E86D3DC7050" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Subsequent Event Type [Axis]</link:label>
    <link:label id="lab_us-gaap_SubsequentEventTypeAxis_87583FBCFDB6C8EFAA278E86D3DC7050_label_en-US" xlink:label="lab_us-gaap_SubsequentEventTypeAxis_87583FBCFDB6C8EFAA278E86D3DC7050" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subsequent Event Type [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_87583FBCFDB6C8EFAA278E86D3DC7050" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_87583FBCFDB6C8EFAA278E86D3DC7050" xlink:to="lab_us-gaap_SubsequentEventTypeAxis_87583FBCFDB6C8EFAA278E86D3DC7050" xlink:type="arc" />
    <link:label id="lab_us-gaap_SubsequentEventTypeDomain_0162CBEB2C9BC17AE4BD8E86D3DD85BF_terseLabel_en-US" xlink:label="lab_us-gaap_SubsequentEventTypeDomain_0162CBEB2C9BC17AE4BD8E86D3DD85BF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Subsequent Event Type [Domain]</link:label>
    <link:label id="lab_us-gaap_SubsequentEventTypeDomain_0162CBEB2C9BC17AE4BD8E86D3DD85BF_label_en-US" xlink:label="lab_us-gaap_SubsequentEventTypeDomain_0162CBEB2C9BC17AE4BD8E86D3DD85BF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subsequent Event Type [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_0162CBEB2C9BC17AE4BD8E86D3DD85BF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_0162CBEB2C9BC17AE4BD8E86D3DD85BF" xlink:to="lab_us-gaap_SubsequentEventTypeDomain_0162CBEB2C9BC17AE4BD8E86D3DD85BF" xlink:type="arc" />
    <link:label id="lab_us-gaap_SubsequentEventMember_ABA7D0A6EBE5EE1E46FA8E86D3DDD6CA_terseLabel_en-US" xlink:label="lab_us-gaap_SubsequentEventMember_ABA7D0A6EBE5EE1E46FA8E86D3DDD6CA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Subsequent Event</link:label>
    <link:label id="lab_us-gaap_SubsequentEventMember_ABA7D0A6EBE5EE1E46FA8E86D3DDD6CA_label_en-US" xlink:label="lab_us-gaap_SubsequentEventMember_ABA7D0A6EBE5EE1E46FA8E86D3DDD6CA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subsequent Event [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_ABA7D0A6EBE5EE1E46FA8E86D3DDD6CA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubsequentEventMember_ABA7D0A6EBE5EE1E46FA8E86D3DDD6CA" xlink:to="lab_us-gaap_SubsequentEventMember_ABA7D0A6EBE5EE1E46FA8E86D3DDD6CA" xlink:type="arc" />
    <link:label id="lab_us-gaap_EnergyAxis_7BED6B9DF1D91C1950288E86D3DDB534_terseLabel_en-US" xlink:label="lab_us-gaap_EnergyAxis_7BED6B9DF1D91C1950288E86D3DDB534" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Instrument [Axis]</link:label>
    <link:label id="lab_us-gaap_EnergyAxis_7BED6B9DF1D91C1950288E86D3DDB534_label_en-US" xlink:label="lab_us-gaap_EnergyAxis_7BED6B9DF1D91C1950288E86D3DDB534" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Energy [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EnergyAxis" xlink:label="loc_us-gaap_EnergyAxis_7BED6B9DF1D91C1950288E86D3DDB534" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EnergyAxis_7BED6B9DF1D91C1950288E86D3DDB534" xlink:to="lab_us-gaap_EnergyAxis_7BED6B9DF1D91C1950288E86D3DDB534" xlink:type="arc" />
    <link:label id="lab_us-gaap_EnergyDomain_B2FCA859D0CB0F98ADD18E86D3DEEB1C_terseLabel_en-US" xlink:label="lab_us-gaap_EnergyDomain_B2FCA859D0CB0F98ADD18E86D3DEEB1C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Instrument Type [Domain]</link:label>
    <link:label id="lab_us-gaap_EnergyDomain_B2FCA859D0CB0F98ADD18E86D3DEEB1C_label_en-US" xlink:label="lab_us-gaap_EnergyDomain_B2FCA859D0CB0F98ADD18E86D3DEEB1C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Energy [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EnergyDomain" xlink:label="loc_us-gaap_EnergyDomain_B2FCA859D0CB0F98ADD18E86D3DEEB1C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EnergyDomain_B2FCA859D0CB0F98ADD18E86D3DEEB1C" xlink:to="lab_us-gaap_EnergyDomain_B2FCA859D0CB0F98ADD18E86D3DEEB1C" xlink:type="arc" />
    <link:label id="lab_us-gaap_CrudeOilMember_FD00895AD936BC80B96A8E86D3DEC7BA_terseLabel_en-US" xlink:label="lab_us-gaap_CrudeOilMember_FD00895AD936BC80B96A8E86D3DEC7BA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Crude Oil</link:label>
    <link:label id="lab_us-gaap_CrudeOilMember_FD00895AD936BC80B96A8E86D3DEC7BA_label_en-US" xlink:label="lab_us-gaap_CrudeOilMember_FD00895AD936BC80B96A8E86D3DEC7BA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Crude Oil [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CrudeOilMember" xlink:label="loc_us-gaap_CrudeOilMember_FD00895AD936BC80B96A8E86D3DEC7BA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CrudeOilMember_FD00895AD936BC80B96A8E86D3DEC7BA" xlink:to="lab_us-gaap_CrudeOilMember_FD00895AD936BC80B96A8E86D3DEC7BA" xlink:type="arc" />
    <link:label id="lab_srt_NaturalGasLiquidsReservesMember_739B85031B24C8576DB48E86D3DE1C2F_terseLabel_en-US" xlink:label="lab_srt_NaturalGasLiquidsReservesMember_739B85031B24C8576DB48E86D3DE1C2F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Natural Gas Liquids [Member]</link:label>
    <link:label id="lab_srt_NaturalGasLiquidsReservesMember_739B85031B24C8576DB48E86D3DE1C2F_label_en-US" xlink:label="lab_srt_NaturalGasLiquidsReservesMember_739B85031B24C8576DB48E86D3DE1C2F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Natural Gas Liquids [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_NaturalGasLiquidsReservesMember" xlink:label="loc_srt_NaturalGasLiquidsReservesMember_739B85031B24C8576DB48E86D3DE1C2F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_NaturalGasLiquidsReservesMember_739B85031B24C8576DB48E86D3DE1C2F" xlink:to="lab_srt_NaturalGasLiquidsReservesMember_739B85031B24C8576DB48E86D3DE1C2F" xlink:type="arc" />
    <link:label id="lab_srt_NaturalGasReservesMember_B8FD459AB67958EEF8588E86D3DE8E4D_terseLabel_en-US" xlink:label="lab_srt_NaturalGasReservesMember_B8FD459AB67958EEF8588E86D3DE8E4D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Natural Gas</link:label>
    <link:label id="lab_srt_NaturalGasReservesMember_B8FD459AB67958EEF8588E86D3DE8E4D_label_en-US" xlink:label="lab_srt_NaturalGasReservesMember_B8FD459AB67958EEF8588E86D3DE8E4D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Natural Gas [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_NaturalGasReservesMember" xlink:label="loc_srt_NaturalGasReservesMember_B8FD459AB67958EEF8588E86D3DE8E4D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_NaturalGasReservesMember_B8FD459AB67958EEF8588E86D3DE8E4D" xlink:to="lab_srt_NaturalGasReservesMember_B8FD459AB67958EEF8588E86D3DE8E4D" xlink:type="arc" />
    <link:label id="lab_oas_ProducedWaterMember_44E09B1187C87DE7B2678E86D3DF7B1C_terseLabel_en-US" xlink:label="lab_oas_ProducedWaterMember_44E09B1187C87DE7B2678E86D3DF7B1C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Produced Water [Member]</link:label>
    <link:label id="lab_oas_ProducedWaterMember_44E09B1187C87DE7B2678E86D3DF7B1C_label_en-US" xlink:label="lab_oas_ProducedWaterMember_44E09B1187C87DE7B2678E86D3DF7B1C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Produced Water [Member]</link:label>
    <link:label id="lab_oas_ProducedWaterMember_44E09B1187C87DE7B2678E86D3DF7B1C_documentation_en-US" xlink:label="lab_oas_ProducedWaterMember_44E09B1187C87DE7B2678E86D3DF7B1C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Produced Water [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_ProducedWaterMember" xlink:label="loc_oas_ProducedWaterMember_44E09B1187C87DE7B2678E86D3DF7B1C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_ProducedWaterMember_44E09B1187C87DE7B2678E86D3DF7B1C" xlink:to="lab_oas_ProducedWaterMember_44E09B1187C87DE7B2678E86D3DF7B1C" xlink:type="arc" />
    <link:label id="lab_srt_LitigationCaseAxis_B21E3C1A72A70A4A40D78E86D3DFA995_terseLabel_en-US" xlink:label="lab_srt_LitigationCaseAxis_B21E3C1A72A70A4A40D78E86D3DFA995" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Litigation Case [Axis]</link:label>
    <link:label id="lab_srt_LitigationCaseAxis_B21E3C1A72A70A4A40D78E86D3DFA995_label_en-US" xlink:label="lab_srt_LitigationCaseAxis_B21E3C1A72A70A4A40D78E86D3DFA995" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Litigation Case [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_LitigationCaseAxis" xlink:label="loc_srt_LitigationCaseAxis_B21E3C1A72A70A4A40D78E86D3DFA995" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_LitigationCaseAxis_B21E3C1A72A70A4A40D78E86D3DFA995" xlink:to="lab_srt_LitigationCaseAxis_B21E3C1A72A70A4A40D78E86D3DFA995" xlink:type="arc" />
    <link:label id="lab_srt_LitigationCaseTypeDomain_1DFBD8C838E2C7399E628E86D3DF57E8_terseLabel_en-US" xlink:label="lab_srt_LitigationCaseTypeDomain_1DFBD8C838E2C7399E628E86D3DF57E8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Litigation Case [Domain]</link:label>
    <link:label id="lab_srt_LitigationCaseTypeDomain_1DFBD8C838E2C7399E628E86D3DF57E8_label_en-US" xlink:label="lab_srt_LitigationCaseTypeDomain_1DFBD8C838E2C7399E628E86D3DF57E8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Litigation Case [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_LitigationCaseTypeDomain" xlink:label="loc_srt_LitigationCaseTypeDomain_1DFBD8C838E2C7399E628E86D3DF57E8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_LitigationCaseTypeDomain_1DFBD8C838E2C7399E628E86D3DF57E8" xlink:to="lab_srt_LitigationCaseTypeDomain_1DFBD8C838E2C7399E628E86D3DF57E8" xlink:type="arc" />
    <link:label id="lab_oas_MiradaLitigationMember_DE3FD06FC0C4864BA5CA8E86D3E47CB8_terseLabel_en-US" xlink:label="lab_oas_MiradaLitigationMember_DE3FD06FC0C4864BA5CA8E86D3E47CB8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Mirada Litigation [Member]</link:label>
    <link:label id="lab_oas_MiradaLitigationMember_DE3FD06FC0C4864BA5CA8E86D3E47CB8_label_en-US" xlink:label="lab_oas_MiradaLitigationMember_DE3FD06FC0C4864BA5CA8E86D3E47CB8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Mirada Litigation [Member]</link:label>
    <link:label id="lab_oas_MiradaLitigationMember_DE3FD06FC0C4864BA5CA8E86D3E47CB8_documentation_en-US" xlink:label="lab_oas_MiradaLitigationMember_DE3FD06FC0C4864BA5CA8E86D3E47CB8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Mirada Litigation [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_MiradaLitigationMember" xlink:label="loc_oas_MiradaLitigationMember_DE3FD06FC0C4864BA5CA8E86D3E47CB8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_MiradaLitigationMember_DE3FD06FC0C4864BA5CA8E86D3E47CB8" xlink:to="lab_oas_MiradaLitigationMember_DE3FD06FC0C4864BA5CA8E86D3E47CB8" xlink:type="arc" />
    <link:label id="lab_us-gaap_LitigationStatusAxis_02816E444D578B559BF68E86D3E52DB1_terseLabel_en-US" xlink:label="lab_us-gaap_LitigationStatusAxis_02816E444D578B559BF68E86D3E52DB1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Litigation Status [Axis]</link:label>
    <link:label id="lab_us-gaap_LitigationStatusAxis_02816E444D578B559BF68E86D3E52DB1_label_en-US" xlink:label="lab_us-gaap_LitigationStatusAxis_02816E444D578B559BF68E86D3E52DB1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Litigation Status [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LitigationStatusAxis" xlink:label="loc_us-gaap_LitigationStatusAxis_02816E444D578B559BF68E86D3E52DB1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LitigationStatusAxis_02816E444D578B559BF68E86D3E52DB1" xlink:to="lab_us-gaap_LitigationStatusAxis_02816E444D578B559BF68E86D3E52DB1" xlink:type="arc" />
    <link:label id="lab_us-gaap_LitigationStatusDomain_1A0DEB5DB5497E3514C68E86D3E5F481_terseLabel_en-US" xlink:label="lab_us-gaap_LitigationStatusDomain_1A0DEB5DB5497E3514C68E86D3E5F481" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Litigation Status [Domain]</link:label>
    <link:label id="lab_us-gaap_LitigationStatusDomain_1A0DEB5DB5497E3514C68E86D3E5F481_label_en-US" xlink:label="lab_us-gaap_LitigationStatusDomain_1A0DEB5DB5497E3514C68E86D3E5F481" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Litigation Status [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LitigationStatusDomain" xlink:label="loc_us-gaap_LitigationStatusDomain_1A0DEB5DB5497E3514C68E86D3E5F481" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LitigationStatusDomain_1A0DEB5DB5497E3514C68E86D3E5F481" xlink:to="lab_us-gaap_LitigationStatusDomain_1A0DEB5DB5497E3514C68E86D3E5F481" xlink:type="arc" />
    <link:label id="lab_us-gaap_PendingLitigationMember_93ED125609701D272F128E86D3E59D9C_terseLabel_en-US" xlink:label="lab_us-gaap_PendingLitigationMember_93ED125609701D272F128E86D3E59D9C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pending Litigation [Member]</link:label>
    <link:label id="lab_us-gaap_PendingLitigationMember_93ED125609701D272F128E86D3E59D9C_label_en-US" xlink:label="lab_us-gaap_PendingLitigationMember_93ED125609701D272F128E86D3E59D9C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pending Litigation [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PendingLitigationMember" xlink:label="loc_us-gaap_PendingLitigationMember_93ED125609701D272F128E86D3E59D9C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PendingLitigationMember_93ED125609701D272F128E86D3E59D9C" xlink:to="lab_us-gaap_PendingLitigationMember_93ED125609701D272F128E86D3E59D9C" xlink:type="arc" />
    <link:label id="lab_us-gaap_LossContingenciesLineItems_8526AA7D600DF8984EAE8E86D3E572F6_terseLabel_en-US" xlink:label="lab_us-gaap_LossContingenciesLineItems_8526AA7D600DF8984EAE8E86D3E572F6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loss Contingencies [Line Items]</link:label>
    <link:label id="lab_us-gaap_LossContingenciesLineItems_8526AA7D600DF8984EAE8E86D3E572F6_label_en-US" xlink:label="lab_us-gaap_LossContingenciesLineItems_8526AA7D600DF8984EAE8E86D3E572F6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loss Contingencies [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LossContingenciesLineItems" xlink:label="loc_us-gaap_LossContingenciesLineItems_8526AA7D600DF8984EAE8E86D3E572F6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LossContingenciesLineItems_8526AA7D600DF8984EAE8E86D3E572F6" xlink:to="lab_us-gaap_LossContingenciesLineItems_8526AA7D600DF8984EAE8E86D3E572F6" xlink:type="arc" />
    <link:label id="lab_us-gaap_OilAndGasDeliveryCommitmentsAndContractsRemainingContractualVolume_B53B05937DFDB27CD7AC8E86D3E65722_terseLabel_en-US" xlink:label="lab_us-gaap_OilAndGasDeliveryCommitmentsAndContractsRemainingContractualVolume_B53B05937DFDB27CD7AC8E86D3E65722" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Minimum quantity to be delivered or transported</link:label>
    <link:label id="lab_us-gaap_OilAndGasDeliveryCommitmentsAndContractsRemainingContractualVolume_B53B05937DFDB27CD7AC8E86D3E65722_label_en-US" xlink:label="lab_us-gaap_OilAndGasDeliveryCommitmentsAndContractsRemainingContractualVolume_B53B05937DFDB27CD7AC8E86D3E65722" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OilAndGasDeliveryCommitmentsAndContractsRemainingContractualVolume" xlink:label="loc_us-gaap_OilAndGasDeliveryCommitmentsAndContractsRemainingContractualVolume_B53B05937DFDB27CD7AC8E86D3E65722" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OilAndGasDeliveryCommitmentsAndContractsRemainingContractualVolume_B53B05937DFDB27CD7AC8E86D3E65722" xlink:to="lab_us-gaap_OilAndGasDeliveryCommitmentsAndContractsRemainingContractualVolume_B53B05937DFDB27CD7AC8E86D3E65722" xlink:type="arc" />
    <link:label id="lab_oas_OilandGasDeliveryCommitmentsandContractsMaximumTerm_53E8706490E3EF2125258EA5D43DE046_terseLabel_en-US" xlink:label="lab_oas_OilandGasDeliveryCommitmentsandContractsMaximumTerm_53E8706490E3EF2125258EA5D43DE046" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Required delivery time-frame under volume commitments time frame agreements</link:label>
    <link:label id="lab_oas_OilandGasDeliveryCommitmentsandContractsMaximumTerm_53E8706490E3EF2125258EA5D43DE046_label_en-US" xlink:label="lab_oas_OilandGasDeliveryCommitmentsandContractsMaximumTerm_53E8706490E3EF2125258EA5D43DE046" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Oil and Gas Delivery Commitments and Contracts, Maximum Term</link:label>
    <link:label id="lab_oas_OilandGasDeliveryCommitmentsandContractsMaximumTerm_53E8706490E3EF2125258EA5D43DE046_documentation_en-US" xlink:label="lab_oas_OilandGasDeliveryCommitmentsandContractsMaximumTerm_53E8706490E3EF2125258EA5D43DE046" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Oil and Gas Delivery Commitments and Contracts, Maximum Term</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_OilandGasDeliveryCommitmentsandContractsMaximumTerm" xlink:label="loc_oas_OilandGasDeliveryCommitmentsandContractsMaximumTerm_53E8706490E3EF2125258EA5D43DE046" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_OilandGasDeliveryCommitmentsandContractsMaximumTerm_53E8706490E3EF2125258EA5D43DE046" xlink:to="lab_oas_OilandGasDeliveryCommitmentsandContractsMaximumTerm_53E8706490E3EF2125258EA5D43DE046" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherCommitment_3E42FDD4D4A0F224A6A68E86D3E65ED5_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCommitment_3E42FDD4D4A0F224A6A68E86D3E65ED5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Estimable future commitments under agreements</link:label>
    <link:label id="lab_us-gaap_OtherCommitment_3E42FDD4D4A0F224A6A68E86D3E65ED5_label_en-US" xlink:label="lab_us-gaap_OtherCommitment_3E42FDD4D4A0F224A6A68E86D3E65ED5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Commitment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherCommitment" xlink:label="loc_us-gaap_OtherCommitment_3E42FDD4D4A0F224A6A68E86D3E65ED5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherCommitment_3E42FDD4D4A0F224A6A68E86D3E65ED5" xlink:to="lab_us-gaap_OtherCommitment_3E42FDD4D4A0F224A6A68E86D3E65ED5" xlink:type="arc" />
    <link:label id="lab_us-gaap_LossContingencyDamagesSoughtValue_AA4D5930DFCDC56C64108E86D3E6CDFC_terseLabel_en-US" xlink:label="lab_us-gaap_LossContingencyDamagesSoughtValue_AA4D5930DFCDC56C64108E86D3E6CDFC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Damages sought (in excess of)</link:label>
    <link:label id="lab_us-gaap_LossContingencyDamagesSoughtValue_AA4D5930DFCDC56C64108E86D3E6CDFC_label_en-US" xlink:label="lab_us-gaap_LossContingencyDamagesSoughtValue_AA4D5930DFCDC56C64108E86D3E6CDFC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loss Contingency, Damages Sought, Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LossContingencyDamagesSoughtValue" xlink:label="loc_us-gaap_LossContingencyDamagesSoughtValue_AA4D5930DFCDC56C64108E86D3E6CDFC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LossContingencyDamagesSoughtValue_AA4D5930DFCDC56C64108E86D3E6CDFC" xlink:to="lab_us-gaap_LossContingencyDamagesSoughtValue_AA4D5930DFCDC56C64108E86D3E6CDFC" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeTaxDisclosureAbstract_74AD6C9CEB60257506A4602EBEA4B3D3_label_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureAbstract_74AD6C9CEB60257506A4602EBEA4B3D3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax Disclosure [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_74AD6C9CEB60257506A4602EBEA4B3D3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_74AD6C9CEB60257506A4602EBEA4B3D3" xlink:to="lab_us-gaap_IncomeTaxDisclosureAbstract_74AD6C9CEB60257506A4602EBEA4B3D3" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeTaxDisclosureTextBlock_F8E3C8303132FECBD1FC602EBEA473CA_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureTextBlock_F8E3C8303132FECBD1FC602EBEA473CA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Taxes</link:label>
    <link:label id="lab_us-gaap_IncomeTaxDisclosureTextBlock_F8E3C8303132FECBD1FC602EBEA473CA_label_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureTextBlock_F8E3C8303132FECBD1FC602EBEA473CA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeTaxDisclosureTextBlock" xlink:label="loc_us-gaap_IncomeTaxDisclosureTextBlock_F8E3C8303132FECBD1FC602EBEA473CA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxDisclosureTextBlock_F8E3C8303132FECBD1FC602EBEA473CA" xlink:to="lab_us-gaap_IncomeTaxDisclosureTextBlock_F8E3C8303132FECBD1FC602EBEA473CA" xlink:type="arc" />
    <link:label id="lab_us-gaap_ReceivablesAbstract_CD21D8895AAEF39095FA602EBF75F0DC_label_en-US" xlink:label="lab_us-gaap_ReceivablesAbstract_CD21D8895AAEF39095FA602EBF75F0DC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Receivables [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ReceivablesAbstract" xlink:label="loc_us-gaap_ReceivablesAbstract_CD21D8895AAEF39095FA602EBF75F0DC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ReceivablesAbstract_CD21D8895AAEF39095FA602EBF75F0DC" xlink:to="lab_us-gaap_ReceivablesAbstract_CD21D8895AAEF39095FA602EBF75F0DC" xlink:type="arc" />
    <link:label id="lab_us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock_098D7BE9AC1D42965EB5602EBF75CED8_terseLabel_en-US" xlink:label="lab_us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock_098D7BE9AC1D42965EB5602EBF75CED8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts Receivable, Net</link:label>
    <link:label id="lab_us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock_098D7BE9AC1D42965EB5602EBF75CED8_label_en-US" xlink:label="lab_us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock_098D7BE9AC1D42965EB5602EBF75CED8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loans, Notes, Trade and Other Receivables Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock" xlink:label="loc_us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock_098D7BE9AC1D42965EB5602EBF75CED8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock_098D7BE9AC1D42965EB5602EBF75CED8" xlink:to="lab_us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock_098D7BE9AC1D42965EB5602EBF75CED8" xlink:type="arc" />
    <link:label id="lab_us-gaap_InventoryDisclosureAbstract_001B965CC693D1E0528A602EBF85B171_label_en-US" xlink:label="lab_us-gaap_InventoryDisclosureAbstract_001B965CC693D1E0528A602EBF85B171" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory Disclosure [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryDisclosureAbstract" xlink:label="loc_us-gaap_InventoryDisclosureAbstract_001B965CC693D1E0528A602EBF85B171" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryDisclosureAbstract_001B965CC693D1E0528A602EBF85B171" xlink:to="lab_us-gaap_InventoryDisclosureAbstract_001B965CC693D1E0528A602EBF85B171" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfInventoryCurrentTableTextBlock_FC5560BCDA17D9294436602EBF85420D_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfInventoryCurrentTableTextBlock_FC5560BCDA17D9294436602EBF85420D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Components of Inventory</link:label>
    <link:label id="lab_us-gaap_ScheduleOfInventoryCurrentTableTextBlock_FC5560BCDA17D9294436602EBF85420D_label_en-US" xlink:label="lab_us-gaap_ScheduleOfInventoryCurrentTableTextBlock_FC5560BCDA17D9294436602EBF85420D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Inventory, Current [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfInventoryCurrentTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfInventoryCurrentTableTextBlock_FC5560BCDA17D9294436602EBF85420D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfInventoryCurrentTableTextBlock_FC5560BCDA17D9294436602EBF85420D" xlink:to="lab_us-gaap_ScheduleOfInventoryCurrentTableTextBlock_FC5560BCDA17D9294436602EBF85420D" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfInventoryNoncurrentTableTextBlock_21D17A2D456BBA3B144C602EBF85A8C6_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfInventoryNoncurrentTableTextBlock_21D17A2D456BBA3B144C602EBF85A8C6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Components of Long-term Inventory</link:label>
    <link:label id="lab_us-gaap_ScheduleOfInventoryNoncurrentTableTextBlock_21D17A2D456BBA3B144C602EBF85A8C6_label_en-US" xlink:label="lab_us-gaap_ScheduleOfInventoryNoncurrentTableTextBlock_21D17A2D456BBA3B144C602EBF85A8C6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Inventory, Noncurrent [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfInventoryNoncurrentTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfInventoryNoncurrentTableTextBlock_21D17A2D456BBA3B144C602EBF85A8C6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfInventoryNoncurrentTableTextBlock_21D17A2D456BBA3B144C602EBF85A8C6" xlink:to="lab_us-gaap_ScheduleOfInventoryNoncurrentTableTextBlock_21D17A2D456BBA3B144C602EBF85A8C6" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetRetirementObligationDisclosureAbstract_7264A48E53D07D37C68D602EBEA4AE14_label_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationDisclosureAbstract_7264A48E53D07D37C68D602EBEA4AE14" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Retirement Obligation Disclosure [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetRetirementObligationDisclosureAbstract" xlink:label="loc_us-gaap_AssetRetirementObligationDisclosureAbstract_7264A48E53D07D37C68D602EBEA4AE14" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetRetirementObligationDisclosureAbstract_7264A48E53D07D37C68D602EBEA4AE14" xlink:to="lab_us-gaap_AssetRetirementObligationDisclosureAbstract_7264A48E53D07D37C68D602EBEA4AE14" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetRetirementObligationRollForwardAnalysisRollForward_592B780FB79254FE261E602EBEA4BC11_terseLabel_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationRollForwardAnalysisRollForward_592B780FB79254FE261E602EBEA4BC11" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]</link:label>
    <link:label id="lab_us-gaap_AssetRetirementObligationRollForwardAnalysisRollForward_592B780FB79254FE261E602EBEA4BC11_label_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationRollForwardAnalysisRollForward_592B780FB79254FE261E602EBEA4BC11" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetRetirementObligationRollForwardAnalysisRollForward" xlink:label="loc_us-gaap_AssetRetirementObligationRollForwardAnalysisRollForward_592B780FB79254FE261E602EBEA4BC11" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetRetirementObligationRollForwardAnalysisRollForward_592B780FB79254FE261E602EBEA4BC11" xlink:to="lab_us-gaap_AssetRetirementObligationRollForwardAnalysisRollForward_592B780FB79254FE261E602EBEA4BC11" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetRetirementObligation_41E25211157656C40C6F602EBEA40E15_periodStartLabel_en-US" xlink:label="lab_us-gaap_AssetRetirementObligation_41E25211157656C40C6F602EBEA40E15" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">December 31, 2018</link:label>
    <link:label id="lab_us-gaap_AssetRetirementObligation_41E25211157656C40C6F602EBEA40E15_label_en-US" xlink:label="lab_us-gaap_AssetRetirementObligation_41E25211157656C40C6F602EBEA40E15" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Retirement Obligation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetRetirementObligation" xlink:label="loc_us-gaap_AssetRetirementObligation_41E25211157656C40C6F602EBEA40E15" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetRetirementObligation_41E25211157656C40C6F602EBEA40E15" xlink:to="lab_us-gaap_AssetRetirementObligation_41E25211157656C40C6F602EBEA40E15" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetRetirementObligationLiabilitiesIncurred_BEAFE1FD246917A155CF602EBEA42E70_terseLabel_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationLiabilitiesIncurred_BEAFE1FD246917A155CF602EBEA42E70" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Liabilities incurred during period</link:label>
    <link:label id="lab_us-gaap_AssetRetirementObligationLiabilitiesIncurred_BEAFE1FD246917A155CF602EBEA42E70_label_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationLiabilitiesIncurred_BEAFE1FD246917A155CF602EBEA42E70" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Retirement Obligation, Liabilities Incurred</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetRetirementObligationLiabilitiesIncurred" xlink:label="loc_us-gaap_AssetRetirementObligationLiabilitiesIncurred_BEAFE1FD246917A155CF602EBEA42E70" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetRetirementObligationLiabilitiesIncurred_BEAFE1FD246917A155CF602EBEA42E70" xlink:to="lab_us-gaap_AssetRetirementObligationLiabilitiesIncurred_BEAFE1FD246917A155CF602EBEA42E70" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetRetirementObligationLiabilitiesSettled_B98E7716E2EAAF0BE124602EBEA486A8_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationLiabilitiesSettled_B98E7716E2EAAF0BE124602EBEA486A8" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Liabilities settled during period</link:label>
    <link:label id="lab_us-gaap_AssetRetirementObligationLiabilitiesSettled_B98E7716E2EAAF0BE124602EBEA486A8_label_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationLiabilitiesSettled_B98E7716E2EAAF0BE124602EBEA486A8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Retirement Obligation, Liabilities Settled</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetRetirementObligationLiabilitiesSettled" xlink:label="loc_us-gaap_AssetRetirementObligationLiabilitiesSettled_B98E7716E2EAAF0BE124602EBEA486A8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetRetirementObligationLiabilitiesSettled_B98E7716E2EAAF0BE124602EBEA486A8" xlink:to="lab_us-gaap_AssetRetirementObligationLiabilitiesSettled_B98E7716E2EAAF0BE124602EBEA486A8" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetRetirementObligationAccretionExpense_82F60CEAC3C280F0B8D4602EBEA4914C_terseLabel_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationAccretionExpense_82F60CEAC3C280F0B8D4602EBEA4914C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accretion expense during period</link:label>
    <link:label id="lab_us-gaap_AssetRetirementObligationAccretionExpense_82F60CEAC3C280F0B8D4602EBEA4914C_label_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationAccretionExpense_82F60CEAC3C280F0B8D4602EBEA4914C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Retirement Obligation, Accretion Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetRetirementObligationAccretionExpense" xlink:label="loc_us-gaap_AssetRetirementObligationAccretionExpense_82F60CEAC3C280F0B8D4602EBEA4914C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetRetirementObligationAccretionExpense_82F60CEAC3C280F0B8D4602EBEA4914C" xlink:to="lab_us-gaap_AssetRetirementObligationAccretionExpense_82F60CEAC3C280F0B8D4602EBEA4914C" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetRetirementObligationRevisionOfEstimate_9C95F2BDB47FCCFB173F602EBEA40E89_terseLabel_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationRevisionOfEstimate_9C95F2BDB47FCCFB173F602EBEA40E89" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Liabilities held for sale</link:label>
    <link:label id="lab_us-gaap_AssetRetirementObligationRevisionOfEstimate_9C95F2BDB47FCCFB173F602EBEA40E89_label_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationRevisionOfEstimate_9C95F2BDB47FCCFB173F602EBEA40E89" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Retirement Obligation, Revision of Estimate</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetRetirementObligationRevisionOfEstimate" xlink:label="loc_us-gaap_AssetRetirementObligationRevisionOfEstimate_9C95F2BDB47FCCFB173F602EBEA40E89" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetRetirementObligationRevisionOfEstimate_9C95F2BDB47FCCFB173F602EBEA40E89" xlink:to="lab_us-gaap_AssetRetirementObligationRevisionOfEstimate_9C95F2BDB47FCCFB173F602EBEA40E89" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetRetirementObligation_BE1661777ABF616107E6602EBEA43B0E_periodEndLabel_en-US" xlink:label="lab_us-gaap_AssetRetirementObligation_BE1661777ABF616107E6602EBEA43B0E" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">March 31, 2019</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetRetirementObligation" xlink:label="loc_us-gaap_AssetRetirementObligation_BE1661777ABF616107E6602EBEA43B0E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetRetirementObligation_BE1661777ABF616107E6602EBEA43B0E" xlink:to="lab_us-gaap_AssetRetirementObligation_BE1661777ABF616107E6602EBEA43B0E" xlink:type="arc" />
    <link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_545B6A18C8C3C697E94B602EBE93BF99_label_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_545B6A18C8C3C697E94B602EBE93BF99" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of Compensation Related Costs, Share-based Payments [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_545B6A18C8C3C697E94B602EBE93BF99" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_545B6A18C8C3C697E94B602EBE93BF99" xlink:to="lab_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_545B6A18C8C3C697E94B602EBE93BF99" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_76529AAEC9052918EFF1602EBE93C0A8_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_76529AAEC9052918EFF1602EBE93C0A8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of Stock Based Compensation Assumptions</link:label>
    <link:label id="lab_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_76529AAEC9052918EFF1602EBE93C0A8_label_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_76529AAEC9052918EFF1602EBE93C0A8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_76529AAEC9052918EFF1602EBE93C0A8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_76529AAEC9052918EFF1602EBE93C0A8" xlink:to="lab_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_76529AAEC9052918EFF1602EBE93C0A8" xlink:type="arc" />
    <link:label id="lab_us-gaap_LeasesAbstract_C6F74CEB6E45F56E1B1C78C01B5A0249_label_en-US" xlink:label="lab_us-gaap_LeasesAbstract_C6F74CEB6E45F56E1B1C78C01B5A0249" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Leases [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LeasesAbstract" xlink:label="loc_us-gaap_LeasesAbstract_C6F74CEB6E45F56E1B1C78C01B5A0249" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeasesAbstract_C6F74CEB6E45F56E1B1C78C01B5A0249" xlink:to="lab_us-gaap_LeasesAbstract_C6F74CEB6E45F56E1B1C78C01B5A0249" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_A39DE7A6B771D6C24DFE78C088703A1A_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_A39DE7A6B771D6C24DFE78C088703A1A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average remaining lease term - operating leases</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_A39DE7A6B771D6C24DFE78C088703A1A_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_A39DE7A6B771D6C24DFE78C088703A1A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Weighted Average Remaining Lease Term</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_A39DE7A6B771D6C24DFE78C088703A1A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_A39DE7A6B771D6C24DFE78C088703A1A" xlink:to="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_A39DE7A6B771D6C24DFE78C088703A1A" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_7F827E8EF17B67B906FD78C088B7A91C_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_7F827E8EF17B67B906FD78C088B7A91C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average discount rate (percent) - operating leases</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_7F827E8EF17B67B906FD78C088B7A91C_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_7F827E8EF17B67B906FD78C088B7A91C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Weighted Average Discount Rate, Percent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_7F827E8EF17B67B906FD78C088B7A91C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_7F827E8EF17B67B906FD78C088B7A91C" xlink:to="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_7F827E8EF17B67B906FD78C088B7A91C" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_AAC5756ABBCE0E4467CE78C08929ED6B_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_AAC5756ABBCE0E4467CE78C08929ED6B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average remaining lease term - finance leases</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_AAC5756ABBCE0E4467CE78C08929ED6B_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_AAC5756ABBCE0E4467CE78C08929ED6B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Weighted Average Remaining Lease Term</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1" xlink:label="loc_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_AAC5756ABBCE0E4467CE78C08929ED6B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_AAC5756ABBCE0E4467CE78C08929ED6B" xlink:to="lab_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_AAC5756ABBCE0E4467CE78C08929ED6B" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_EF8C08552B9DF38430ED78C08A689DDC_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_EF8C08552B9DF38430ED78C08A689DDC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average discount rate (percent) - finance leases</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_EF8C08552B9DF38430ED78C08A689DDC_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_EF8C08552B9DF38430ED78C08A689DDC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Weighted Average Discount Rate, Percent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent" xlink:label="loc_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_EF8C08552B9DF38430ED78C08A689DDC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_EF8C08552B9DF38430ED78C08A689DDC" xlink:to="lab_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_EF8C08552B9DF38430ED78C08A689DDC" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtDisclosureAbstract_353AF4488ACEA5A80F04602EBEE77472_label_en-US" xlink:label="lab_us-gaap_DebtDisclosureAbstract_353AF4488ACEA5A80F04602EBEE77472" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Disclosure [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtDisclosureAbstract" xlink:label="loc_us-gaap_DebtDisclosureAbstract_353AF4488ACEA5A80F04602EBEE77472" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtDisclosureAbstract_353AF4488ACEA5A80F04602EBEE77472" xlink:to="lab_us-gaap_DebtDisclosureAbstract_353AF4488ACEA5A80F04602EBEE77472" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongTermDebtTextBlock_73FB9863D3B4955B6216602EBEE77B0F_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtTextBlock_73FB9863D3B4955B6216602EBEE77B0F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-Term Debt</link:label>
    <link:label id="lab_us-gaap_LongTermDebtTextBlock_73FB9863D3B4955B6216602EBEE77B0F_label_en-US" xlink:label="lab_us-gaap_LongTermDebtTextBlock_73FB9863D3B4955B6216602EBEE77B0F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtTextBlock" xlink:label="loc_us-gaap_LongTermDebtTextBlock_73FB9863D3B4955B6216602EBEE77B0F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtTextBlock_73FB9863D3B4955B6216602EBEE77B0F" xlink:to="lab_us-gaap_LongTermDebtTextBlock_73FB9863D3B4955B6216602EBEE77B0F" xlink:type="arc" />
    <link:label id="lab_srt_ConsolidationItemsAxis_B75FC780B87BEDDBE76B7A57D5FD977E_terseLabel_en-US" xlink:label="lab_srt_ConsolidationItemsAxis_B75FC780B87BEDDBE76B7A57D5FD977E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consolidation Items [Axis]</link:label>
    <link:label id="lab_srt_ConsolidationItemsAxis_B75FC780B87BEDDBE76B7A57D5FD977E_label_en-US" xlink:label="lab_srt_ConsolidationItemsAxis_B75FC780B87BEDDBE76B7A57D5FD977E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Consolidation Items [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ConsolidationItemsAxis" xlink:label="loc_srt_ConsolidationItemsAxis_B75FC780B87BEDDBE76B7A57D5FD977E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ConsolidationItemsAxis_B75FC780B87BEDDBE76B7A57D5FD977E" xlink:to="lab_srt_ConsolidationItemsAxis_B75FC780B87BEDDBE76B7A57D5FD977E" xlink:type="arc" />
    <link:label id="lab_srt_ConsolidationItemsDomain_68504FECEB6B5B2B49B07A57D5FD0C4B_terseLabel_en-US" xlink:label="lab_srt_ConsolidationItemsDomain_68504FECEB6B5B2B49B07A57D5FD0C4B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consolidation Items [Domain]</link:label>
    <link:label id="lab_srt_ConsolidationItemsDomain_68504FECEB6B5B2B49B07A57D5FD0C4B_label_en-US" xlink:label="lab_srt_ConsolidationItemsDomain_68504FECEB6B5B2B49B07A57D5FD0C4B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Consolidation Items [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_68504FECEB6B5B2B49B07A57D5FD0C4B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ConsolidationItemsDomain_68504FECEB6B5B2B49B07A57D5FD0C4B" xlink:to="lab_srt_ConsolidationItemsDomain_68504FECEB6B5B2B49B07A57D5FD0C4B" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingSegmentsMember_78E851B6B950700A91A47A57D5FD5154_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingSegmentsMember_78E851B6B950700A91A47A57D5FD5154" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Segments</link:label>
    <link:label id="lab_us-gaap_OperatingSegmentsMember_78E851B6B950700A91A47A57D5FD5154_label_en-US" xlink:label="lab_us-gaap_OperatingSegmentsMember_78E851B6B950700A91A47A57D5FD5154" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Segments [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingSegmentsMember" xlink:label="loc_us-gaap_OperatingSegmentsMember_78E851B6B950700A91A47A57D5FD5154" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingSegmentsMember_78E851B6B950700A91A47A57D5FD5154" xlink:to="lab_us-gaap_OperatingSegmentsMember_78E851B6B950700A91A47A57D5FD5154" xlink:type="arc" />
    <link:label id="lab_srt_ProductOrServiceAxis_CDCFF07E2448B36E37897A57D5FF71FA_terseLabel_en-US" xlink:label="lab_srt_ProductOrServiceAxis_CDCFF07E2448B36E37897A57D5FF71FA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Product and Service [Axis]</link:label>
    <link:label id="lab_srt_ProductOrServiceAxis_CDCFF07E2448B36E37897A57D5FF71FA_label_en-US" xlink:label="lab_srt_ProductOrServiceAxis_CDCFF07E2448B36E37897A57D5FF71FA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Product and Service [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_CDCFF07E2448B36E37897A57D5FF71FA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ProductOrServiceAxis_CDCFF07E2448B36E37897A57D5FF71FA" xlink:to="lab_srt_ProductOrServiceAxis_CDCFF07E2448B36E37897A57D5FF71FA" xlink:type="arc" />
    <link:label id="lab_srt_ProductsAndServicesDomain_A7D1D2C86B1D573423BE7A57D5FF7A62_terseLabel_en-US" xlink:label="lab_srt_ProductsAndServicesDomain_A7D1D2C86B1D573423BE7A57D5FF7A62" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Product and Service [Domain]</link:label>
    <link:label id="lab_srt_ProductsAndServicesDomain_A7D1D2C86B1D573423BE7A57D5FF7A62_label_en-US" xlink:label="lab_srt_ProductsAndServicesDomain_A7D1D2C86B1D573423BE7A57D5FF7A62" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Product and Service [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_A7D1D2C86B1D573423BE7A57D5FF7A62" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ProductsAndServicesDomain_A7D1D2C86B1D573423BE7A57D5FF7A62" xlink:to="lab_srt_ProductsAndServicesDomain_A7D1D2C86B1D573423BE7A57D5FF7A62" xlink:type="arc" />
    <link:label id="lab_oas_OilProductionMember_EEB52EFE31754293A74C7A57D60003B2_terseLabel_en-US" xlink:label="lab_oas_OilProductionMember_EEB52EFE31754293A74C7A57D60003B2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Crude oil revenues</link:label>
    <link:label id="lab_oas_OilProductionMember_EEB52EFE31754293A74C7A57D60003B2_label_en-US" xlink:label="lab_oas_OilProductionMember_EEB52EFE31754293A74C7A57D60003B2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Oil Production [Member]</link:label>
    <link:label id="lab_oas_OilProductionMember_EEB52EFE31754293A74C7A57D60003B2_documentation_en-US" xlink:label="lab_oas_OilProductionMember_EEB52EFE31754293A74C7A57D60003B2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Oil Production [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_OilProductionMember" xlink:label="loc_oas_OilProductionMember_EEB52EFE31754293A74C7A57D60003B2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_OilProductionMember_EEB52EFE31754293A74C7A57D60003B2" xlink:to="lab_oas_OilProductionMember_EEB52EFE31754293A74C7A57D60003B2" xlink:type="arc" />
    <link:label id="lab_oas_PurchasedOilSalesMember_3EC7528FE5575D4FB4E67A57D60093AC_terseLabel_en-US" xlink:label="lab_oas_PurchasedOilSalesMember_3EC7528FE5575D4FB4E67A57D60093AC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Purchased crude oil sales</link:label>
    <link:label id="lab_oas_PurchasedOilSalesMember_3EC7528FE5575D4FB4E67A57D60093AC_label_en-US" xlink:label="lab_oas_PurchasedOilSalesMember_3EC7528FE5575D4FB4E67A57D60093AC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchased Oil Sales [Member]</link:label>
    <link:label id="lab_oas_PurchasedOilSalesMember_3EC7528FE5575D4FB4E67A57D60093AC_documentation_en-US" xlink:label="lab_oas_PurchasedOilSalesMember_3EC7528FE5575D4FB4E67A57D60093AC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Purchased Oil Sales [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_PurchasedOilSalesMember" xlink:label="loc_oas_PurchasedOilSalesMember_3EC7528FE5575D4FB4E67A57D60093AC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_PurchasedOilSalesMember_3EC7528FE5575D4FB4E67A57D60093AC" xlink:to="lab_oas_PurchasedOilSalesMember_3EC7528FE5575D4FB4E67A57D60093AC" xlink:type="arc" />
    <link:label id="lab_us-gaap_NaturalGasProductionMember_DF6042C70C0F2D416BBD7A57D600ED22_terseLabel_en-US" xlink:label="lab_us-gaap_NaturalGasProductionMember_DF6042C70C0F2D416BBD7A57D600ED22" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Natural gas revenues</link:label>
    <link:label id="lab_us-gaap_NaturalGasProductionMember_DF6042C70C0F2D416BBD7A57D600ED22_label_en-US" xlink:label="lab_us-gaap_NaturalGasProductionMember_DF6042C70C0F2D416BBD7A57D600ED22" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Natural Gas, Production [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NaturalGasProductionMember" xlink:label="loc_us-gaap_NaturalGasProductionMember_DF6042C70C0F2D416BBD7A57D600ED22" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NaturalGasProductionMember_DF6042C70C0F2D416BBD7A57D600ED22" xlink:to="lab_us-gaap_NaturalGasProductionMember_DF6042C70C0F2D416BBD7A57D600ED22" xlink:type="arc" />
    <link:label id="lab_oas_PurchasedGasSalesMember_DAE6138C68AB7CD3FDB77A57D60080C0_terseLabel_en-US" xlink:label="lab_oas_PurchasedGasSalesMember_DAE6138C68AB7CD3FDB77A57D60080C0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Purchased natural gas sales</link:label>
    <link:label id="lab_oas_PurchasedGasSalesMember_DAE6138C68AB7CD3FDB77A57D60080C0_label_en-US" xlink:label="lab_oas_PurchasedGasSalesMember_DAE6138C68AB7CD3FDB77A57D60080C0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchased Gas Sales [Member]</link:label>
    <link:label id="lab_oas_PurchasedGasSalesMember_DAE6138C68AB7CD3FDB77A57D60080C0_documentation_en-US" xlink:label="lab_oas_PurchasedGasSalesMember_DAE6138C68AB7CD3FDB77A57D60080C0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Purchased Gas Sales [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_PurchasedGasSalesMember" xlink:label="loc_oas_PurchasedGasSalesMember_DAE6138C68AB7CD3FDB77A57D60080C0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_PurchasedGasSalesMember_DAE6138C68AB7CD3FDB77A57D60080C0" xlink:to="lab_oas_PurchasedGasSalesMember_DAE6138C68AB7CD3FDB77A57D60080C0" xlink:type="arc" />
    <link:label id="lab_oas_NaturalGasLiquidServicesMember_A28C0F0DA47A52D6B6FC7A57D601BB01_terseLabel_en-US" xlink:label="lab_oas_NaturalGasLiquidServicesMember_A28C0F0DA47A52D6B6FC7A57D601BB01" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">NGL revenues</link:label>
    <link:label id="lab_oas_NaturalGasLiquidServicesMember_A28C0F0DA47A52D6B6FC7A57D601BB01_label_en-US" xlink:label="lab_oas_NaturalGasLiquidServicesMember_A28C0F0DA47A52D6B6FC7A57D601BB01" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Natural Gas Liquid Services [Member]</link:label>
    <link:label id="lab_oas_NaturalGasLiquidServicesMember_A28C0F0DA47A52D6B6FC7A57D601BB01_documentation_en-US" xlink:label="lab_oas_NaturalGasLiquidServicesMember_A28C0F0DA47A52D6B6FC7A57D601BB01" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Natural Gas Liquid (NGL) Services [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_NaturalGasLiquidServicesMember" xlink:label="loc_oas_NaturalGasLiquidServicesMember_A28C0F0DA47A52D6B6FC7A57D601BB01" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_NaturalGasLiquidServicesMember_A28C0F0DA47A52D6B6FC7A57D601BB01" xlink:to="lab_oas_NaturalGasLiquidServicesMember_A28C0F0DA47A52D6B6FC7A57D601BB01" xlink:type="arc" />
    <link:label id="lab_oas_CrudeOilandNaturalGasServicesMember_566C299A1656F67ACD2B7A57D6018438_terseLabel_en-US" xlink:label="lab_oas_CrudeOilandNaturalGasServicesMember_566C299A1656F67ACD2B7A57D6018438" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Crude oil and natural gas revenues</link:label>
    <link:label id="lab_oas_CrudeOilandNaturalGasServicesMember_566C299A1656F67ACD2B7A57D6018438_label_en-US" xlink:label="lab_oas_CrudeOilandNaturalGasServicesMember_566C299A1656F67ACD2B7A57D6018438" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Crude Oil and Natural Gas Services [Member]</link:label>
    <link:label id="lab_oas_CrudeOilandNaturalGasServicesMember_566C299A1656F67ACD2B7A57D6018438_documentation_en-US" xlink:label="lab_oas_CrudeOilandNaturalGasServicesMember_566C299A1656F67ACD2B7A57D6018438" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Crude Oil and Natural Gas Services [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_CrudeOilandNaturalGasServicesMember" xlink:label="loc_oas_CrudeOilandNaturalGasServicesMember_566C299A1656F67ACD2B7A57D6018438" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_CrudeOilandNaturalGasServicesMember_566C299A1656F67ACD2B7A57D6018438" xlink:to="lab_oas_CrudeOilandNaturalGasServicesMember_566C299A1656F67ACD2B7A57D6018438" xlink:type="arc" />
    <link:label id="lab_oas_ProducedandFlowbackWaterServiceMember_5B8D95A1D2FD4AB6844B7A57D6014E28_terseLabel_en-US" xlink:label="lab_oas_ProducedandFlowbackWaterServiceMember_5B8D95A1D2FD4AB6844B7A57D6014E28" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Produced and flowback water revenues</link:label>
    <link:label id="lab_oas_ProducedandFlowbackWaterServiceMember_5B8D95A1D2FD4AB6844B7A57D6014E28_label_en-US" xlink:label="lab_oas_ProducedandFlowbackWaterServiceMember_5B8D95A1D2FD4AB6844B7A57D6014E28" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Produced and Flowback Water Service [Member]</link:label>
    <link:label id="lab_oas_ProducedandFlowbackWaterServiceMember_5B8D95A1D2FD4AB6844B7A57D6014E28_documentation_en-US" xlink:label="lab_oas_ProducedandFlowbackWaterServiceMember_5B8D95A1D2FD4AB6844B7A57D6014E28" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Produced and Flowback Water Service [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_ProducedandFlowbackWaterServiceMember" xlink:label="loc_oas_ProducedandFlowbackWaterServiceMember_5B8D95A1D2FD4AB6844B7A57D6014E28" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_ProducedandFlowbackWaterServiceMember_5B8D95A1D2FD4AB6844B7A57D6014E28" xlink:to="lab_oas_ProducedandFlowbackWaterServiceMember_5B8D95A1D2FD4AB6844B7A57D6014E28" xlink:type="arc" />
    <link:label id="lab_oas_TotalMidstreamServicesProductandServicesMemberMember_3F067698009BA40902A17A77E30D69CF_terseLabel_en-US" xlink:label="lab_oas_TotalMidstreamServicesProductandServicesMemberMember_3F067698009BA40902A17A77E30D69CF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total midstream service revenues</link:label>
    <link:label id="lab_oas_TotalMidstreamServicesProductandServicesMemberMember_3F067698009BA40902A17A77E30D69CF_label_en-US" xlink:label="lab_oas_TotalMidstreamServicesProductandServicesMemberMember_3F067698009BA40902A17A77E30D69CF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Total Midstream Services, Product and Services [Member] [Member]</link:label>
    <link:label id="lab_oas_TotalMidstreamServicesProductandServicesMemberMember_3F067698009BA40902A17A77E30D69CF_documentation_en-US" xlink:label="lab_oas_TotalMidstreamServicesProductandServicesMemberMember_3F067698009BA40902A17A77E30D69CF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Total Midstream Services, Product and Services [Member] [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_TotalMidstreamServicesProductandServicesMemberMember" xlink:label="loc_oas_TotalMidstreamServicesProductandServicesMemberMember_3F067698009BA40902A17A77E30D69CF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_TotalMidstreamServicesProductandServicesMemberMember_3F067698009BA40902A17A77E30D69CF" xlink:to="lab_oas_TotalMidstreamServicesProductandServicesMemberMember_3F067698009BA40902A17A77E30D69CF" xlink:type="arc" />
    <link:label id="lab_oas_NaturalGasandNGLServicesMember_238AD0128C1289C5AEDD7A57D601E49E_terseLabel_en-US" xlink:label="lab_oas_NaturalGasandNGLServicesMember_238AD0128C1289C5AEDD7A57D601E49E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Natural gas and NGL revenues</link:label>
    <link:label id="lab_oas_NaturalGasandNGLServicesMember_238AD0128C1289C5AEDD7A57D601E49E_label_en-US" xlink:label="lab_oas_NaturalGasandNGLServicesMember_238AD0128C1289C5AEDD7A57D601E49E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Natural Gas and NGL Services [Member]</link:label>
    <link:label id="lab_oas_NaturalGasandNGLServicesMember_238AD0128C1289C5AEDD7A57D601E49E_documentation_en-US" xlink:label="lab_oas_NaturalGasandNGLServicesMember_238AD0128C1289C5AEDD7A57D601E49E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Natural Gas and NGL Services [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_NaturalGasandNGLServicesMember" xlink:label="loc_oas_NaturalGasandNGLServicesMember_238AD0128C1289C5AEDD7A57D601E49E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_NaturalGasandNGLServicesMember_238AD0128C1289C5AEDD7A57D601E49E" xlink:to="lab_oas_NaturalGasandNGLServicesMember_238AD0128C1289C5AEDD7A57D601E49E" xlink:type="arc" />
    <link:label id="lab_oas_WaterServicesMember_A3D43A6F8C7809BDAC987A57D6016AC5_terseLabel_en-US" xlink:label="lab_oas_WaterServicesMember_A3D43A6F8C7809BDAC987A57D6016AC5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Freshwater revenues</link:label>
    <link:label id="lab_oas_WaterServicesMember_A3D43A6F8C7809BDAC987A57D6016AC5_label_en-US" xlink:label="lab_oas_WaterServicesMember_A3D43A6F8C7809BDAC987A57D6016AC5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Water Services [Member]</link:label>
    <link:label id="lab_oas_WaterServicesMember_A3D43A6F8C7809BDAC987A57D6016AC5_documentation_en-US" xlink:label="lab_oas_WaterServicesMember_A3D43A6F8C7809BDAC987A57D6016AC5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Water Services [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_WaterServicesMember" xlink:label="loc_oas_WaterServicesMember_A3D43A6F8C7809BDAC987A57D6016AC5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_WaterServicesMember_A3D43A6F8C7809BDAC987A57D6016AC5" xlink:to="lab_oas_WaterServicesMember_A3D43A6F8C7809BDAC987A57D6016AC5" xlink:type="arc" />
    <link:label id="lab_oas_HydraulicFracturingServicesMember_22AF829FD65615EAF1547A57D6028BA5_terseLabel_en-US" xlink:label="lab_oas_HydraulicFracturingServicesMember_22AF829FD65615EAF1547A57D6028BA5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Hydraulic fracturing revenues</link:label>
    <link:label id="lab_oas_HydraulicFracturingServicesMember_22AF829FD65615EAF1547A57D6028BA5_label_en-US" xlink:label="lab_oas_HydraulicFracturingServicesMember_22AF829FD65615EAF1547A57D6028BA5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Hydraulic Fracturing Services [Member]</link:label>
    <link:label id="lab_oas_HydraulicFracturingServicesMember_22AF829FD65615EAF1547A57D6028BA5_documentation_en-US" xlink:label="lab_oas_HydraulicFracturingServicesMember_22AF829FD65615EAF1547A57D6028BA5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Hydraulic Fracturing Services [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_HydraulicFracturingServicesMember" xlink:label="loc_oas_HydraulicFracturingServicesMember_22AF829FD65615EAF1547A57D6028BA5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_HydraulicFracturingServicesMember_22AF829FD65615EAF1547A57D6028BA5" xlink:to="lab_oas_HydraulicFracturingServicesMember_22AF829FD65615EAF1547A57D6028BA5" xlink:type="arc" />
    <link:label id="lab_oas_EquipmentRentalServicesMember_D8B7820432121B7D694C7A57D602A50F_terseLabel_en-US" xlink:label="lab_oas_EquipmentRentalServicesMember_D8B7820432121B7D694C7A57D602A50F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equipment rental revenues</link:label>
    <link:label id="lab_oas_EquipmentRentalServicesMember_D8B7820432121B7D694C7A57D602A50F_label_en-US" xlink:label="lab_oas_EquipmentRentalServicesMember_D8B7820432121B7D694C7A57D602A50F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equipment Rental Services [Member]</link:label>
    <link:label id="lab_oas_EquipmentRentalServicesMember_D8B7820432121B7D694C7A57D602A50F_documentation_en-US" xlink:label="lab_oas_EquipmentRentalServicesMember_D8B7820432121B7D694C7A57D602A50F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Equipment Rental Services [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_EquipmentRentalServicesMember" xlink:label="loc_oas_EquipmentRentalServicesMember_D8B7820432121B7D694C7A57D602A50F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_EquipmentRentalServicesMember_D8B7820432121B7D694C7A57D602A50F" xlink:to="lab_oas_EquipmentRentalServicesMember_D8B7820432121B7D694C7A57D602A50F" xlink:type="arc" />
    <link:label id="lab_oas_TotalMidstreamProductsMember_8B147131A8D73D27BD007A74E689A5E7_terseLabel_en-US" xlink:label="lab_oas_TotalMidstreamProductsMember_8B147131A8D73D27BD007A74E689A5E7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total midstream product revenues</link:label>
    <link:label id="lab_oas_TotalMidstreamProductsMember_8B147131A8D73D27BD007A74E689A5E7_label_en-US" xlink:label="lab_oas_TotalMidstreamProductsMember_8B147131A8D73D27BD007A74E689A5E7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Total Midstream Products [Member]</link:label>
    <link:label id="lab_oas_TotalMidstreamProductsMember_8B147131A8D73D27BD007A74E689A5E7_documentation_en-US" xlink:label="lab_oas_TotalMidstreamProductsMember_8B147131A8D73D27BD007A74E689A5E7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Total Midstream Products [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_TotalMidstreamProductsMember" xlink:label="loc_oas_TotalMidstreamProductsMember_8B147131A8D73D27BD007A74E689A5E7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_TotalMidstreamProductsMember_8B147131A8D73D27BD007A74E689A5E7" xlink:to="lab_oas_TotalMidstreamProductsMember_8B147131A8D73D27BD007A74E689A5E7" xlink:type="arc" />
    <link:label id="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_400D7C767EA8EB3A86727A57D602390C_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_400D7C767EA8EB3A86727A57D602390C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total revenues</link:label>
    <link:label id="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_400D7C767EA8EB3A86727A57D602390C_label_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_400D7C767EA8EB3A86727A57D602390C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue from Contract with Customer, Excluding Assessed Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_400D7C767EA8EB3A86727A57D602390C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_400D7C767EA8EB3A86727A57D602390C" xlink:to="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_400D7C767EA8EB3A86727A57D602390C" xlink:type="arc" />
    <link:label id="lab_us-gaap_ContractWithCustomerAssetNet_4225AF1EC0E5566334FE7A57D602984C_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerAssetNet_4225AF1EC0E5566334FE7A57D602984C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contract asset</link:label>
    <link:label id="lab_us-gaap_ContractWithCustomerAssetNet_4225AF1EC0E5566334FE7A57D602984C_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerAssetNet_4225AF1EC0E5566334FE7A57D602984C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contract with Customer, Asset, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ContractWithCustomerAssetNet" xlink:label="loc_us-gaap_ContractWithCustomerAssetNet_4225AF1EC0E5566334FE7A57D602984C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerAssetNet_4225AF1EC0E5566334FE7A57D602984C" xlink:to="lab_us-gaap_ContractWithCustomerAssetNet_4225AF1EC0E5566334FE7A57D602984C" xlink:type="arc" />
    <link:label id="lab_us-gaap_ContractWithCustomerLiability_BF05E89919AE7860B05F7A57D603F16C_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiability_BF05E89919AE7860B05F7A57D603F16C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contract liability</link:label>
    <link:label id="lab_us-gaap_ContractWithCustomerLiability_BF05E89919AE7860B05F7A57D603F16C_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiability_BF05E89919AE7860B05F7A57D603F16C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contract with Customer, Liability</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ContractWithCustomerLiability" xlink:label="loc_us-gaap_ContractWithCustomerLiability_BF05E89919AE7860B05F7A57D603F16C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerLiability_BF05E89919AE7860B05F7A57D603F16C" xlink:to="lab_us-gaap_ContractWithCustomerLiability_BF05E89919AE7860B05F7A57D603F16C" xlink:type="arc" />
    <link:label id="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_CC9212B38E24E91C719F9895F38ADA0A_terseLabel_en-US" xlink:label="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_CC9212B38E24E91C719F9895F38ADA0A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Organization and Operations of the Company</link:label>
    <link:label id="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_CC9212B38E24E91C719F9895F38ADA0A_label_en-US" xlink:label="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_CC9212B38E24E91C719F9895F38ADA0A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_CC9212B38E24E91C719F9895F38ADA0A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_CC9212B38E24E91C719F9895F38ADA0A" xlink:to="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_CC9212B38E24E91C719F9895F38ADA0A" xlink:type="arc" />
    <link:label id="lab_us-gaap_EarningsPerShareAbstract_2C7A98188D3AA375C93D602EBE74E411_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareAbstract_2C7A98188D3AA375C93D602EBE74E411" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_2C7A98188D3AA375C93D602EBE74E411" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareAbstract_2C7A98188D3AA375C93D602EBE74E411" xlink:to="lab_us-gaap_EarningsPerShareAbstract_2C7A98188D3AA375C93D602EBE74E411" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfWeightedAverageNumberOfSharesTableTextBlock_11AF60740D02420C9C4B602EBE7405FE_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfWeightedAverageNumberOfSharesTableTextBlock_11AF60740D02420C9C4B602EBE7405FE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Weighted-Average Number of Shares Outstanding</link:label>
    <link:label id="lab_us-gaap_ScheduleOfWeightedAverageNumberOfSharesTableTextBlock_11AF60740D02420C9C4B602EBE7405FE_label_en-US" xlink:label="lab_us-gaap_ScheduleOfWeightedAverageNumberOfSharesTableTextBlock_11AF60740D02420C9C4B602EBE7405FE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Weighted Average Number of Shares [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfWeightedAverageNumberOfSharesTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfWeightedAverageNumberOfSharesTableTextBlock_11AF60740D02420C9C4B602EBE7405FE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfWeightedAverageNumberOfSharesTableTextBlock_11AF60740D02420C9C4B602EBE7405FE" xlink:to="lab_us-gaap_ScheduleOfWeightedAverageNumberOfSharesTableTextBlock_11AF60740D02420C9C4B602EBE7405FE" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_25E69E6774E2D91BC6B6602EBE74DF15_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_25E69E6774E2D91BC6B6602EBE74DF15" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Common Shares Excluded From Diluted Earnings (Loss) per Share Calculation</link:label>
    <link:label id="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_25E69E6774E2D91BC6B6602EBE74DF15_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_25E69E6774E2D91BC6B6602EBE74DF15" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_25E69E6774E2D91BC6B6602EBE74DF15" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_25E69E6774E2D91BC6B6602EBE74DF15" xlink:to="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_25E69E6774E2D91BC6B6602EBE74DF15" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_8D10FDBBA1E17EB7DB97602EBE5335BF_terseLabel_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_8D10FDBBA1E17EB7DB97602EBE5335BF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commitments and Contingencies</link:label>
    <link:label id="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_8D10FDBBA1E17EB7DB97602EBE5335BF_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_8D10FDBBA1E17EB7DB97602EBE5335BF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commitments and Contingencies Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_8D10FDBBA1E17EB7DB97602EBE5335BF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_8D10FDBBA1E17EB7DB97602EBE5335BF" xlink:to="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_8D10FDBBA1E17EB7DB97602EBE5335BF" xlink:type="arc" />
    <link:label id="lab_us-gaap_StatementOfCashFlowsAbstract_3D432F567248C20D763E935F518BBAC7_label_en-US" xlink:label="lab_us-gaap_StatementOfCashFlowsAbstract_3D432F567248C20D763E935F518BBAC7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Cash Flows [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="loc_us-gaap_StatementOfCashFlowsAbstract_3D432F567248C20D763E935F518BBAC7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_3D432F567248C20D763E935F518BBAC7" xlink:to="lab_us-gaap_StatementOfCashFlowsAbstract_3D432F567248C20D763E935F518BBAC7" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_282A966773593818C418935F518B9071_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_282A966773593818C418935F518B9071" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from operating activities:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_282A966773593818C418935F518B9071_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_282A966773593818C418935F518B9071" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_282A966773593818C418935F518B9071" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_282A966773593818C418935F518B9071" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_282A966773593818C418935F518B9071" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProfitLoss_4C7E4EFCA01424797326935F518B5BA7_terseLabel_en-US" xlink:label="lab_us-gaap_ProfitLoss_4C7E4EFCA01424797326935F518B5BA7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net income (loss) including non-controlling interests</link:label>
    <link:label id="lab_us-gaap_ProfitLoss_4C7E4EFCA01424797326935F518B5BA7_label_en-US" xlink:label="lab_us-gaap_ProfitLoss_4C7E4EFCA01424797326935F518B5BA7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Income (Loss), Including Portion Attributable to Noncontrolling Interest</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_4C7E4EFCA01424797326935F518B5BA7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProfitLoss_4C7E4EFCA01424797326935F518B5BA7" xlink:to="lab_us-gaap_ProfitLoss_4C7E4EFCA01424797326935F518B5BA7" xlink:type="arc" />
    <link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_A5C8271D99C654E2B658935F518B6816_verboseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_A5C8271D99C654E2B658935F518B6816" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by operating activities:</link:label>
    <link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_A5C8271D99C654E2B658935F518B6816_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_A5C8271D99C654E2B658935F518B6816" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_A5C8271D99C654E2B658935F518B6816" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_A5C8271D99C654E2B658935F518B6816" xlink:to="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_A5C8271D99C654E2B658935F518B6816" xlink:type="arc" />
    <link:label id="lab_us-gaap_DepreciationDepletionAndAmortization_F6F771006514EC484268935F518B1DD0_terseLabel_en-US" xlink:label="lab_us-gaap_DepreciationDepletionAndAmortization_F6F771006514EC484268935F518B1DD0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Depreciation, depletion and amortization</link:label>
    <link:label id="lab_us-gaap_DepreciationDepletionAndAmortization_F6F771006514EC484268935F518B1DD0_label_en-US" xlink:label="lab_us-gaap_DepreciationDepletionAndAmortization_F6F771006514EC484268935F518B1DD0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Depreciation, Depletion and Amortization</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_F6F771006514EC484268935F518B1DD0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DepreciationDepletionAndAmortization_F6F771006514EC484268935F518B1DD0" xlink:to="lab_us-gaap_DepreciationDepletionAndAmortization_F6F771006514EC484268935F518B1DD0" xlink:type="arc" />
    <link:label id="lab_us-gaap_GainLossOnSaleOfProperty_683850B17FFE127D0717935F518B9E6C_negatedLabel_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfProperty_683850B17FFE127D0717935F518B9E6C" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Loss on sale of properties</link:label>
    <link:label id="lab_us-gaap_GainLossOnSaleOfProperty_683850B17FFE127D0717935F518B9E6C_label_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfProperty_683850B17FFE127D0717935F518B9E6C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gain (Loss) on Disposition of Oil and Gas and Timber Property</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GainLossOnSaleOfProperty" xlink:label="loc_us-gaap_GainLossOnSaleOfProperty_683850B17FFE127D0717935F518B9E6C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GainLossOnSaleOfProperty_683850B17FFE127D0717935F518B9E6C" xlink:to="lab_us-gaap_GainLossOnSaleOfProperty_683850B17FFE127D0717935F518B9E6C" xlink:type="arc" />
    <link:label id="lab_us-gaap_ImpairmentOfOilAndGasProperties_F3A0A2EE840A38188A67935F518B63F3_terseLabel_en-US" xlink:label="lab_us-gaap_ImpairmentOfOilAndGasProperties_F3A0A2EE840A38188A67935F518B63F3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Impairment</link:label>
    <link:label id="lab_us-gaap_ImpairmentOfOilAndGasProperties_F3A0A2EE840A38188A67935F518B63F3_label_en-US" xlink:label="lab_us-gaap_ImpairmentOfOilAndGasProperties_F3A0A2EE840A38188A67935F518B63F3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Impairment of Oil and Gas Properties</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ImpairmentOfOilAndGasProperties" xlink:label="loc_us-gaap_ImpairmentOfOilAndGasProperties_F3A0A2EE840A38188A67935F518B63F3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ImpairmentOfOilAndGasProperties_F3A0A2EE840A38188A67935F518B63F3" xlink:to="lab_us-gaap_ImpairmentOfOilAndGasProperties_F3A0A2EE840A38188A67935F518B63F3" xlink:type="arc" />
    <link:label id="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_097A3B1AAC8F4D5DA739935F518B55A3_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_097A3B1AAC8F4D5DA739935F518B55A3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred income taxes</link:label>
    <link:label id="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_097A3B1AAC8F4D5DA739935F518B55A3_label_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_097A3B1AAC8F4D5DA739935F518B55A3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Income Tax Expense (Benefit)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_097A3B1AAC8F4D5DA739935F518B55A3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_097A3B1AAC8F4D5DA739935F518B55A3" xlink:to="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_097A3B1AAC8F4D5DA739935F518B55A3" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeGainLossOnDerivativeNet_5F77AB67A21E84D3DBB9935F518B1B51_negatedLabel_en-US" xlink:label="lab_us-gaap_DerivativeGainLossOnDerivativeNet_5F77AB67A21E84D3DBB9935F518B1B51" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Derivative instruments</link:label>
    <link:label id="lab_us-gaap_DerivativeGainLossOnDerivativeNet_5F77AB67A21E84D3DBB9935F518B1B51_label_en-US" xlink:label="lab_us-gaap_DerivativeGainLossOnDerivativeNet_5F77AB67A21E84D3DBB9935F518B1B51" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative, Gain (Loss) on Derivative, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeGainLossOnDerivativeNet" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_5F77AB67A21E84D3DBB9935F518B1B51" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeGainLossOnDerivativeNet_5F77AB67A21E84D3DBB9935F518B1B51" xlink:to="lab_us-gaap_DerivativeGainLossOnDerivativeNet_5F77AB67A21E84D3DBB9935F518B1B51" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensation_F39C590475F121402647935F518BE40C_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_F39C590475F121402647935F518BE40C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity-based compensation expenses</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensation_F39C590475F121402647935F518BE40C_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_F39C590475F121402647935F518BE40C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_F39C590475F121402647935F518BE40C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensation_F39C590475F121402647935F518BE40C" xlink:to="lab_us-gaap_ShareBasedCompensation_F39C590475F121402647935F518BE40C" xlink:type="arc" />
    <link:label id="lab_oas_DebtDiscountAmortizationAndOther_D4DDA478D73E74DDC2E8935F518B66D1_terseLabel_en-US" xlink:label="lab_oas_DebtDiscountAmortizationAndOther_D4DDA478D73E74DDC2E8935F518B66D1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred financing costs amortization and other</link:label>
    <link:label id="lab_oas_DebtDiscountAmortizationAndOther_D4DDA478D73E74DDC2E8935F518B66D1_label_en-US" xlink:label="lab_oas_DebtDiscountAmortizationAndOther_D4DDA478D73E74DDC2E8935F518B66D1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Discount Amortization And Other</link:label>
    <link:label id="lab_oas_DebtDiscountAmortizationAndOther_D4DDA478D73E74DDC2E8935F518B66D1_documentation_en-US" xlink:label="lab_oas_DebtDiscountAmortizationAndOther_D4DDA478D73E74DDC2E8935F518B66D1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The total of the component of interest expense representing the noncash expenses charged against earnings in the period to amortize the long-term deferred financing costs and other income (expense) included in net income that results in no cash inflows or outflows in the period. Includes noncash adjustments to reconcile net income (loss) to cash provided by (used in) operating activities that are not separately disclosed.</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_DebtDiscountAmortizationAndOther" xlink:label="loc_oas_DebtDiscountAmortizationAndOther_D4DDA478D73E74DDC2E8935F518B66D1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_DebtDiscountAmortizationAndOther_D4DDA478D73E74DDC2E8935F518B66D1" xlink:to="lab_oas_DebtDiscountAmortizationAndOther_D4DDA478D73E74DDC2E8935F518B66D1" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_A1505C771610FF3A2651935F518BCCB2_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_A1505C771610FF3A2651935F518BCCB2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Working capital and other changes:</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_A1505C771610FF3A2651935F518BCCB2_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_A1505C771610FF3A2651935F518BCCB2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Operating Capital [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_A1505C771610FF3A2651935F518BCCB2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_A1505C771610FF3A2651935F518BCCB2" xlink:to="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_A1505C771610FF3A2651935F518BCCB2" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_018E6BC93ACC41630762935F518B19F1_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_018E6BC93ACC41630762935F518B19F1" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Change in accounts receivable, net</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_018E6BC93ACC41630762935F518B19F1_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_018E6BC93ACC41630762935F518B19F1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Accounts Receivable</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_018E6BC93ACC41630762935F518B19F1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_018E6BC93ACC41630762935F518B19F1" xlink:to="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_018E6BC93ACC41630762935F518B19F1" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInInventories_F844A405D3C4DF52EC80935F518B878F_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInInventories_F844A405D3C4DF52EC80935F518B878F" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Change in inventory</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInInventories_F844A405D3C4DF52EC80935F518B878F_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInInventories_F844A405D3C4DF52EC80935F518B878F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Inventories</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_F844A405D3C4DF52EC80935F518B878F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInInventories_F844A405D3C4DF52EC80935F518B878F" xlink:to="lab_us-gaap_IncreaseDecreaseInInventories_F844A405D3C4DF52EC80935F518B878F" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInPrepaidExpense_B60A7EC1B6F706CC5DC1935F518BC652_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPrepaidExpense_B60A7EC1B6F706CC5DC1935F518BC652" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Change in prepaid expenses</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInPrepaidExpense_B60A7EC1B6F706CC5DC1935F518BC652_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPrepaidExpense_B60A7EC1B6F706CC5DC1935F518BC652" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Prepaid Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidExpense" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidExpense_B60A7EC1B6F706CC5DC1935F518BC652" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInPrepaidExpense_B60A7EC1B6F706CC5DC1935F518BC652" xlink:to="lab_us-gaap_IncreaseDecreaseInPrepaidExpense_B60A7EC1B6F706CC5DC1935F518BC652" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_08B94618E971EF08F2D3935F518B3D55_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_08B94618E971EF08F2D3935F518B3D55" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in accounts payable, interest payable and accrued liabilities</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_08B94618E971EF08F2D3935F518B3D55_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_08B94618E971EF08F2D3935F518B3D55" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Accounts Payable and Accrued Liabilities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_08B94618E971EF08F2D3935F518B3D55" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_08B94618E971EF08F2D3935F518B3D55" xlink:to="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_08B94618E971EF08F2D3935F518B3D55" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_8C91158057985DBB1DF6935F518BBB24_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_8C91158057985DBB1DF6935F518BBB24" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Change in other assets and liabilities, net</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_8C91158057985DBB1DF6935F518BBB24_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_8C91158057985DBB1DF6935F518BBB24" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Other Operating Assets and Liabilities, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_8C91158057985DBB1DF6935F518BBB24" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_8C91158057985DBB1DF6935F518BBB24" xlink:to="lab_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_8C91158057985DBB1DF6935F518BBB24" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_7C5C862C864BE9F8F59C935F518BD10E_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_7C5C862C864BE9F8F59C935F518BD10E" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by operating activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_7C5C862C864BE9F8F59C935F518BD10E_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_7C5C862C864BE9F8F59C935F518BD10E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_7C5C862C864BE9F8F59C935F518BD10E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_7C5C862C864BE9F8F59C935F518BD10E" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_7C5C862C864BE9F8F59C935F518BD10E" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_0BAA505A6088D85A2740935F518B2D38_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_0BAA505A6088D85A2740935F518B2D38" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from investing activities:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_0BAA505A6088D85A2740935F518B2D38_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_0BAA505A6088D85A2740935F518B2D38" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_0BAA505A6088D85A2740935F518B2D38" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_0BAA505A6088D85A2740935F518B2D38" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_0BAA505A6088D85A2740935F518B2D38" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties_5C8834CCFDFE397C6E46935F518B4322_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties_5C8834CCFDFE397C6E46935F518B4322" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Capital expenditures</link:label>
    <link:label id="lab_us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties_5C8834CCFDFE397C6E46935F518B4322_label_en-US" xlink:label="lab_us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties_5C8834CCFDFE397C6E46935F518B4322" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Explore and Develop Oil and Gas Properties</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties" xlink:label="loc_us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties_5C8834CCFDFE397C6E46935F518B4322" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties_5C8834CCFDFE397C6E46935F518B4322" xlink:to="lab_us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties_5C8834CCFDFE397C6E46935F518B4322" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_FF0044C0B2D30AAFBF36935F518B23BE_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_FF0044C0B2D30AAFBF36935F518B23BE" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Acquisitions</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_FF0044C0B2D30AAFBF36935F518B23BE_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_FF0044C0B2D30AAFBF36935F518B23BE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Businesses, Net of Cash Acquired</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_FF0044C0B2D30AAFBF36935F518B23BE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_FF0044C0B2D30AAFBF36935F518B23BE" xlink:to="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_FF0044C0B2D30AAFBF36935F518B23BE" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProceedsFromDerivativeInstrumentInvestingActivities_B36CE453571A98E81562935F518B5E7C_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromDerivativeInstrumentInvestingActivities_B36CE453571A98E81562935F518B5E7C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative settlements</link:label>
    <link:label id="lab_us-gaap_ProceedsFromDerivativeInstrumentInvestingActivities_B36CE453571A98E81562935F518B5E7C_label_en-US" xlink:label="lab_us-gaap_ProceedsFromDerivativeInstrumentInvestingActivities_B36CE453571A98E81562935F518B5E7C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Derivative Instrument, Investing Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProceedsFromDerivativeInstrumentInvestingActivities" xlink:label="loc_us-gaap_ProceedsFromDerivativeInstrumentInvestingActivities_B36CE453571A98E81562935F518B5E7C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromDerivativeInstrumentInvestingActivities_B36CE453571A98E81562935F518B5E7C" xlink:to="lab_us-gaap_ProceedsFromDerivativeInstrumentInvestingActivities_B36CE453571A98E81562935F518B5E7C" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsForDerivativeInstrumentInvestingActivities_E90ED04886D653182A28935F518B1D81_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsForDerivativeInstrumentInvestingActivities_E90ED04886D653182A28935F518B1D81" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Derivative settlements</link:label>
    <link:label id="lab_us-gaap_PaymentsForDerivativeInstrumentInvestingActivities_E90ED04886D653182A28935F518B1D81_label_en-US" xlink:label="lab_us-gaap_PaymentsForDerivativeInstrumentInvestingActivities_E90ED04886D653182A28935F518B1D81" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments for Derivative Instrument, Investing Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsForDerivativeInstrumentInvestingActivities" xlink:label="loc_us-gaap_PaymentsForDerivativeInstrumentInvestingActivities_E90ED04886D653182A28935F518B1D81" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsForDerivativeInstrumentInvestingActivities_E90ED04886D653182A28935F518B1D81" xlink:to="lab_us-gaap_PaymentsForDerivativeInstrumentInvestingActivities_E90ED04886D653182A28935F518B1D81" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_37AB8B58010D560EEAEC935F518BE616_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_37AB8B58010D560EEAEC935F518BE616" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_37AB8B58010D560EEAEC935F518BE616_label_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_37AB8B58010D560EEAEC935F518BE616" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments for (Proceeds from) Other Investing Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_37AB8B58010D560EEAEC935F518BE616" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_37AB8B58010D560EEAEC935F518BE616" xlink:to="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_37AB8B58010D560EEAEC935F518BE616" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_FAA70720958C400CD833935F518BC371_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_FAA70720958C400CD833935F518BC371" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash used in investing activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_FAA70720958C400CD833935F518BC371_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_FAA70720958C400CD833935F518BC371" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_FAA70720958C400CD833935F518BC371" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_FAA70720958C400CD833935F518BC371" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_FAA70720958C400CD833935F518BC371" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_7BC6A79C750A6FACD5D2935F518B0FC1_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_7BC6A79C750A6FACD5D2935F518B0FC1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from financing activities:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_7BC6A79C750A6FACD5D2935F518B0FC1_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_7BC6A79C750A6FACD5D2935F518B0FC1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Financing Activities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_7BC6A79C750A6FACD5D2935F518B0FC1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_7BC6A79C750A6FACD5D2935F518B0FC1" xlink:to="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_7BC6A79C750A6FACD5D2935F518B0FC1" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProceedsFromLongTermLinesOfCredit_2CC99040753BEA203AAF935F519B068B_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromLongTermLinesOfCredit_2CC99040753BEA203AAF935F519B068B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from Revolving Credit Facilities</link:label>
    <link:label id="lab_us-gaap_ProceedsFromLongTermLinesOfCredit_2CC99040753BEA203AAF935F519B068B_label_en-US" xlink:label="lab_us-gaap_ProceedsFromLongTermLinesOfCredit_2CC99040753BEA203AAF935F519B068B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Long-term Lines of Credit</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProceedsFromLongTermLinesOfCredit" xlink:label="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_2CC99040753BEA203AAF935F519B068B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_2CC99040753BEA203AAF935F519B068B" xlink:to="lab_us-gaap_ProceedsFromLongTermLinesOfCredit_2CC99040753BEA203AAF935F519B068B" xlink:type="arc" />
    <link:label id="lab_us-gaap_RepaymentsOfLongTermLinesOfCredit_9E5B3ED5D269D21E2AE5935F519B893F_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfLongTermLinesOfCredit_9E5B3ED5D269D21E2AE5935F519B893F" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Principal payments on Revolving Credit Facilities</link:label>
    <link:label id="lab_us-gaap_RepaymentsOfLongTermLinesOfCredit_9E5B3ED5D269D21E2AE5935F519B893F_label_en-US" xlink:label="lab_us-gaap_RepaymentsOfLongTermLinesOfCredit_9E5B3ED5D269D21E2AE5935F519B893F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Repayments of Long-term Lines of Credit</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RepaymentsOfLongTermLinesOfCredit" xlink:label="loc_us-gaap_RepaymentsOfLongTermLinesOfCredit_9E5B3ED5D269D21E2AE5935F519B893F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RepaymentsOfLongTermLinesOfCredit_9E5B3ED5D269D21E2AE5935F519B893F" xlink:to="lab_us-gaap_RepaymentsOfLongTermLinesOfCredit_9E5B3ED5D269D21E2AE5935F519B893F" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsOfDebtIssuanceCosts_23676FD996650A9DD4A3935F519B5DAD_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfDebtIssuanceCosts_23676FD996650A9DD4A3935F519B5DAD" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Deferred financing costs</link:label>
    <link:label id="lab_us-gaap_PaymentsOfDebtIssuanceCosts_23676FD996650A9DD4A3935F519B5DAD_label_en-US" xlink:label="lab_us-gaap_PaymentsOfDebtIssuanceCosts_23676FD996650A9DD4A3935F519B5DAD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments of Debt Issuance Costs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsOfDebtIssuanceCosts" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_23676FD996650A9DD4A3935F519B5DAD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsOfDebtIssuanceCosts_23676FD996650A9DD4A3935F519B5DAD" xlink:to="lab_us-gaap_PaymentsOfDebtIssuanceCosts_23676FD996650A9DD4A3935F519B5DAD" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_841CABA9AEA38F71E03E935F519B1B7E_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_841CABA9AEA38F71E03E935F519B1B7E" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Purchases of treasury stock</link:label>
    <link:label id="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_841CABA9AEA38F71E03E935F519B1B7E_label_en-US" xlink:label="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_841CABA9AEA38F71E03E935F519B1B7E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments Related to Tax Withholding for Share-based Compensation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_841CABA9AEA38F71E03E935F519B1B7E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_841CABA9AEA38F71E03E935F519B1B7E" xlink:to="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_841CABA9AEA38F71E03E935F519B1B7E" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsToMinorityShareholders_4D345EC79E3BB23ABF2D935F519BA357_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToMinorityShareholders_4D345EC79E3BB23ABF2D935F519BA357" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Distributions to non-controlling interests</link:label>
    <link:label id="lab_us-gaap_PaymentsToMinorityShareholders_4D345EC79E3BB23ABF2D935F519BA357_label_en-US" xlink:label="lab_us-gaap_PaymentsToMinorityShareholders_4D345EC79E3BB23ABF2D935F519BA357" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Noncontrolling Interests</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsToMinorityShareholders" xlink:label="loc_us-gaap_PaymentsToMinorityShareholders_4D345EC79E3BB23ABF2D935F519BA357" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToMinorityShareholders_4D345EC79E3BB23ABF2D935F519BA357" xlink:to="lab_us-gaap_PaymentsToMinorityShareholders_4D345EC79E3BB23ABF2D935F519BA357" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_4E8D667674E80782A69B935F519B2C01_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_4E8D667674E80782A69B935F519B2C01" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_4E8D667674E80782A69B935F519B2C01_label_en-US" xlink:label="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_4E8D667674E80782A69B935F519B2C01" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from (Payments for) Other Financing Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_4E8D667674E80782A69B935F519B2C01" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_4E8D667674E80782A69B935F519B2C01" xlink:to="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_4E8D667674E80782A69B935F519B2C01" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_AD8C63417C0153F5FD2E935F519BFE27_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_AD8C63417C0153F5FD2E935F519BFE27" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by financing activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_AD8C63417C0153F5FD2E935F519BFE27_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_AD8C63417C0153F5FD2E935F519BFE27" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Financing Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_AD8C63417C0153F5FD2E935F519BFE27" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_AD8C63417C0153F5FD2E935F519BFE27" xlink:to="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_AD8C63417C0153F5FD2E935F519BFE27" xlink:type="arc" />
    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_DF79ACB7D0C338939DDC935F519B4621_totalLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_DF79ACB7D0C338939DDC935F519B4621" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Increase (decrease) in cash and cash equivalents</link:label>
    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_DF79ACB7D0C338939DDC935F519B4621_label_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_DF79ACB7D0C338939DDC935F519B4621" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_DF79ACB7D0C338939DDC935F519B4621" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_DF79ACB7D0C338939DDC935F519B4621" xlink:to="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_DF79ACB7D0C338939DDC935F519B4621" xlink:type="arc" />
    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValueAbstract_4F7AFAE46D461957A16D935F519BDE3F_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValueAbstract_4F7AFAE46D461957A16D935F519BDE3F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents:</link:label>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValueAbstract_4F7AFAE46D461957A16D935F519BDE3F_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValueAbstract_4F7AFAE46D461957A16D935F519BDE3F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents, at Carrying Value [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValueAbstract" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValueAbstract_4F7AFAE46D461957A16D935F519BDE3F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsAtCarryingValueAbstract_4F7AFAE46D461957A16D935F519BDE3F" xlink:to="lab_us-gaap_CashAndCashEquivalentsAtCarryingValueAbstract_4F7AFAE46D461957A16D935F519BDE3F" xlink:type="arc" />
    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D4EF06C7F729F2EFB0DB935F519B2C12_periodStartLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D4EF06C7F729F2EFB0DB935F519B2C12" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Beginning of period</link:label>
    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D4EF06C7F729F2EFB0DB935F519B2C12_label_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D4EF06C7F729F2EFB0DB935F519B2C12" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D4EF06C7F729F2EFB0DB935F519B2C12" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D4EF06C7F729F2EFB0DB935F519B2C12" xlink:to="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D4EF06C7F729F2EFB0DB935F519B2C12" xlink:type="arc" />
    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_1228DC86043EC6679EEE935F519B5E8D_periodEndLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_1228DC86043EC6679EEE935F519B5E8D" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">End of period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_1228DC86043EC6679EEE935F519B5E8D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_1228DC86043EC6679EEE935F519B5E8D" xlink:to="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_1228DC86043EC6679EEE935F519B5E8D" xlink:type="arc" />
    <link:label id="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_16D9848F04ABA0879E9B935F519B263B_terseLabel_en-US" xlink:label="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_16D9848F04ABA0879E9B935F519B263B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Supplemental non-cash transactions:</link:label>
    <link:label id="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_16D9848F04ABA0879E9B935F519B263B_label_en-US" xlink:label="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_16D9848F04ABA0879E9B935F519B263B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xlink:label="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_16D9848F04ABA0879E9B935F519B263B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_16D9848F04ABA0879E9B935F519B263B" xlink:to="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_16D9848F04ABA0879E9B935F519B263B" xlink:type="arc" />
    <link:label id="lab_oas_ChangeInCapitalExpendituresIncurredButNotYetPaid_EA46333813F7122C89C9935F519BC048_terseLabel_en-US" xlink:label="lab_oas_ChangeInCapitalExpendituresIncurredButNotYetPaid_EA46333813F7122C89C9935F519BC048" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in accrued capital expenditures</link:label>
    <link:label id="lab_oas_ChangeInCapitalExpendituresIncurredButNotYetPaid_EA46333813F7122C89C9935F519BC048_label_en-US" xlink:label="lab_oas_ChangeInCapitalExpendituresIncurredButNotYetPaid_EA46333813F7122C89C9935F519BC048" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Change In Capital Expenditures Incurred But Not Yet Paid</link:label>
    <link:label id="lab_oas_ChangeInCapitalExpendituresIncurredButNotYetPaid_EA46333813F7122C89C9935F519BC048_documentation_en-US" xlink:label="lab_oas_ChangeInCapitalExpendituresIncurredButNotYetPaid_EA46333813F7122C89C9935F519BC048" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Change In Capital Expenditures Incurred But Not Yet Paid</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_ChangeInCapitalExpendituresIncurredButNotYetPaid" xlink:label="loc_oas_ChangeInCapitalExpendituresIncurredButNotYetPaid_EA46333813F7122C89C9935F519BC048" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_ChangeInCapitalExpendituresIncurredButNotYetPaid_EA46333813F7122C89C9935F519BC048" xlink:to="lab_oas_ChangeInCapitalExpendituresIncurredButNotYetPaid_EA46333813F7122C89C9935F519BC048" xlink:type="arc" />
    <link:label id="lab_oas_NonCashAssetRetirementObligations_AC7058F59A01F8B99C00935F519BA55A_terseLabel_en-US" xlink:label="lab_oas_NonCashAssetRetirementObligations_AC7058F59A01F8B99C00935F519BA55A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in asset retirement obligations</link:label>
    <link:label id="lab_oas_NonCashAssetRetirementObligations_AC7058F59A01F8B99C00935F519BA55A_label_en-US" xlink:label="lab_oas_NonCashAssetRetirementObligations_AC7058F59A01F8B99C00935F519BA55A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non Cash Asset Retirement Obligations</link:label>
    <link:label id="lab_oas_NonCashAssetRetirementObligations_AC7058F59A01F8B99C00935F519BA55A_documentation_en-US" xlink:label="lab_oas_NonCashAssetRetirementObligations_AC7058F59A01F8B99C00935F519BA55A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The net change in asset retirement obligations less any cash paid to settle such obligations during the reporting period.</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_NonCashAssetRetirementObligations" xlink:label="loc_oas_NonCashAssetRetirementObligations_AC7058F59A01F8B99C00935F519BA55A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_NonCashAssetRetirementObligations_AC7058F59A01F8B99C00935F519BA55A" xlink:to="lab_oas_NonCashAssetRetirementObligations_AC7058F59A01F8B99C00935F519BA55A" xlink:type="arc" />
    <link:label id="lab_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_DA1EFD6624DAD76D3641935F519BE4A1_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_DA1EFD6624DAD76D3641935F519BE4A1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Issuance of shares in connection with acquisition</link:label>
    <link:label id="lab_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_DA1EFD6624DAD76D3641935F519BE4A1_label_en-US" xlink:label="lab_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_DA1EFD6624DAD76D3641935F519BE4A1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Combination, Consideration Transferred, Equity Interests Issued and Issuable</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_DA1EFD6624DAD76D3641935F519BE4A1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_DA1EFD6624DAD76D3641935F519BE4A1" xlink:to="lab_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_DA1EFD6624DAD76D3641935F519BE4A1" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetRetirementObligationCurrent_FACAC4D165492D7450BF602EBEA41589_terseLabel_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationCurrent_FACAC4D165492D7450BF602EBEA41589" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total asset retirement obligations, current portion</link:label>
    <link:label id="lab_us-gaap_AssetRetirementObligationCurrent_FACAC4D165492D7450BF602EBEA41589_label_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationCurrent_FACAC4D165492D7450BF602EBEA41589" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Retirement Obligation, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetRetirementObligationCurrent" xlink:label="loc_us-gaap_AssetRetirementObligationCurrent_FACAC4D165492D7450BF602EBEA41589" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetRetirementObligationCurrent_FACAC4D165492D7450BF602EBEA41589" xlink:to="lab_us-gaap_AssetRetirementObligationCurrent_FACAC4D165492D7450BF602EBEA41589" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueDisclosuresAbstract_F3F168E7597582A2FB19602EBF6AFE60_label_en-US" xlink:label="lab_us-gaap_FairValueDisclosuresAbstract_F3F168E7597582A2FB19602EBF6AFE60" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Disclosures [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_F3F168E7597582A2FB19602EBF6AFE60" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_F3F168E7597582A2FB19602EBF6AFE60" xlink:to="lab_us-gaap_FairValueDisclosuresAbstract_F3F168E7597582A2FB19602EBF6AFE60" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueDisclosuresTextBlock_5D44704D9AD97CDA3F08602EBF6AD0FA_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueDisclosuresTextBlock_5D44704D9AD97CDA3F08602EBF6AD0FA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Measurements</link:label>
    <link:label id="lab_us-gaap_FairValueDisclosuresTextBlock_5D44704D9AD97CDA3F08602EBF6AD0FA_label_en-US" xlink:label="lab_us-gaap_FairValueDisclosuresTextBlock_5D44704D9AD97CDA3F08602EBF6AD0FA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Disclosures [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueDisclosuresTextBlock" xlink:label="loc_us-gaap_FairValueDisclosuresTextBlock_5D44704D9AD97CDA3F08602EBF6AD0FA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueDisclosuresTextBlock_5D44704D9AD97CDA3F08602EBF6AD0FA" xlink:to="lab_us-gaap_FairValueDisclosuresTextBlock_5D44704D9AD97CDA3F08602EBF6AD0FA" xlink:type="arc" />
    <link:label id="lab_srt_ScheduleOfCondensedBalanceSheetTableTextBlock_C016173A5334783F631079D0511ADC2E_terseLabel_en-US" xlink:label="lab_srt_ScheduleOfCondensedBalanceSheetTableTextBlock_C016173A5334783F631079D0511ADC2E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Condensed Consolidating Balance Sheet</link:label>
    <link:label id="lab_srt_ScheduleOfCondensedBalanceSheetTableTextBlock_C016173A5334783F631079D0511ADC2E_label_en-US" xlink:label="lab_srt_ScheduleOfCondensedBalanceSheetTableTextBlock_C016173A5334783F631079D0511ADC2E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Condensed Balance Sheet [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ScheduleOfCondensedBalanceSheetTableTextBlock" xlink:label="loc_srt_ScheduleOfCondensedBalanceSheetTableTextBlock_C016173A5334783F631079D0511ADC2E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ScheduleOfCondensedBalanceSheetTableTextBlock_C016173A5334783F631079D0511ADC2E" xlink:to="lab_srt_ScheduleOfCondensedBalanceSheetTableTextBlock_C016173A5334783F631079D0511ADC2E" xlink:type="arc" />
    <link:label id="lab_srt_ScheduleOfCondensedIncomeStatementTableTextBlock_0EDBC70C4EEE82E055FA79D0511A8EFC_terseLabel_en-US" xlink:label="lab_srt_ScheduleOfCondensedIncomeStatementTableTextBlock_0EDBC70C4EEE82E055FA79D0511A8EFC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Condensed Consolidating Statement of Operations</link:label>
    <link:label id="lab_srt_ScheduleOfCondensedIncomeStatementTableTextBlock_0EDBC70C4EEE82E055FA79D0511A8EFC_label_en-US" xlink:label="lab_srt_ScheduleOfCondensedIncomeStatementTableTextBlock_0EDBC70C4EEE82E055FA79D0511A8EFC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Condensed Income Statement [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ScheduleOfCondensedIncomeStatementTableTextBlock" xlink:label="loc_srt_ScheduleOfCondensedIncomeStatementTableTextBlock_0EDBC70C4EEE82E055FA79D0511A8EFC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ScheduleOfCondensedIncomeStatementTableTextBlock_0EDBC70C4EEE82E055FA79D0511A8EFC" xlink:to="lab_srt_ScheduleOfCondensedIncomeStatementTableTextBlock_0EDBC70C4EEE82E055FA79D0511A8EFC" xlink:type="arc" />
    <link:label id="lab_srt_ScheduleOfCondensedCashFlowStatementTableTextBlock_00BB0FD795340A366DC079D0511B46B3_terseLabel_en-US" xlink:label="lab_srt_ScheduleOfCondensedCashFlowStatementTableTextBlock_00BB0FD795340A366DC079D0511B46B3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Condensed Consolidating Statement of Cash Flows</link:label>
    <link:label id="lab_srt_ScheduleOfCondensedCashFlowStatementTableTextBlock_00BB0FD795340A366DC079D0511B46B3_label_en-US" xlink:label="lab_srt_ScheduleOfCondensedCashFlowStatementTableTextBlock_00BB0FD795340A366DC079D0511B46B3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Condensed Cash Flow Statement [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ScheduleOfCondensedCashFlowStatementTableTextBlock" xlink:label="loc_srt_ScheduleOfCondensedCashFlowStatementTableTextBlock_00BB0FD795340A366DC079D0511B46B3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ScheduleOfCondensedCashFlowStatementTableTextBlock_00BB0FD795340A366DC079D0511B46B3" xlink:to="lab_srt_ScheduleOfCondensedCashFlowStatementTableTextBlock_00BB0FD795340A366DC079D0511B46B3" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_46B77ADBBFAAAD9323BD9896C2A39C19_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_46B77ADBBFAAAD9323BD9896C2A39C19" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Related Party Transactions, by Related Party [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_46B77ADBBFAAAD9323BD9896C2A39C19_label_en-US" xlink:label="lab_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_46B77ADBBFAAAD9323BD9896C2A39C19" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Related Party Transactions, by Related Party [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_46B77ADBBFAAAD9323BD9896C2A39C19" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_46B77ADBBFAAAD9323BD9896C2A39C19" xlink:to="lab_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_46B77ADBBFAAAD9323BD9896C2A39C19" xlink:type="arc" />
    <link:label id="lab_srt_OwnershipAxis_41AF0CF15C3DA0D6EF689896C2A33CC7_terseLabel_en-US" xlink:label="lab_srt_OwnershipAxis_41AF0CF15C3DA0D6EF689896C2A33CC7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Ownership [Axis]</link:label>
    <link:label id="lab_srt_OwnershipAxis_41AF0CF15C3DA0D6EF689896C2A33CC7_label_en-US" xlink:label="lab_srt_OwnershipAxis_41AF0CF15C3DA0D6EF689896C2A33CC7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ownership [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_OwnershipAxis" xlink:label="loc_srt_OwnershipAxis_41AF0CF15C3DA0D6EF689896C2A33CC7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_OwnershipAxis_41AF0CF15C3DA0D6EF689896C2A33CC7" xlink:to="lab_srt_OwnershipAxis_41AF0CF15C3DA0D6EF689896C2A33CC7" xlink:type="arc" />
    <link:label id="lab_srt_OwnershipDomain_4D3EB92CBF040C9D2E5E9896C2A3AD9D_terseLabel_en-US" xlink:label="lab_srt_OwnershipDomain_4D3EB92CBF040C9D2E5E9896C2A3AD9D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Ownership [Domain]</link:label>
    <link:label id="lab_srt_OwnershipDomain_4D3EB92CBF040C9D2E5E9896C2A3AD9D_label_en-US" xlink:label="lab_srt_OwnershipDomain_4D3EB92CBF040C9D2E5E9896C2A3AD9D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ownership [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_OwnershipDomain" xlink:label="loc_srt_OwnershipDomain_4D3EB92CBF040C9D2E5E9896C2A3AD9D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_OwnershipDomain_4D3EB92CBF040C9D2E5E9896C2A3AD9D" xlink:to="lab_srt_OwnershipDomain_4D3EB92CBF040C9D2E5E9896C2A3AD9D" xlink:type="arc" />
    <link:label id="lab_oas_BobcatDevCoMember_80DDB96581F49D15858C9896C2A3D4FA_terseLabel_en-US" xlink:label="lab_oas_BobcatDevCoMember_80DDB96581F49D15858C9896C2A3D4FA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Bobcat DevCo</link:label>
    <link:label id="lab_oas_BobcatDevCoMember_80DDB96581F49D15858C9896C2A3D4FA_label_en-US" xlink:label="lab_oas_BobcatDevCoMember_80DDB96581F49D15858C9896C2A3D4FA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Bobcat DevCo [Member]</link:label>
    <link:label id="lab_oas_BobcatDevCoMember_80DDB96581F49D15858C9896C2A3D4FA_documentation_en-US" xlink:label="lab_oas_BobcatDevCoMember_80DDB96581F49D15858C9896C2A3D4FA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Bobcat DevCo [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_BobcatDevCoMember" xlink:label="loc_oas_BobcatDevCoMember_80DDB96581F49D15858C9896C2A3D4FA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_BobcatDevCoMember_80DDB96581F49D15858C9896C2A3D4FA" xlink:to="lab_oas_BobcatDevCoMember_80DDB96581F49D15858C9896C2A3D4FA" xlink:type="arc" />
    <link:label id="lab_us-gaap_RelatedPartyTransactionAxis_B0ABFDC56A399725CB009896C2A4B800_terseLabel_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionAxis_B0ABFDC56A399725CB009896C2A4B800" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Related Party Transaction [Axis]</link:label>
    <link:label id="lab_us-gaap_RelatedPartyTransactionAxis_B0ABFDC56A399725CB009896C2A4B800_label_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionAxis_B0ABFDC56A399725CB009896C2A4B800" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party Transaction [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RelatedPartyTransactionAxis" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_B0ABFDC56A399725CB009896C2A4B800" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_B0ABFDC56A399725CB009896C2A4B800" xlink:to="lab_us-gaap_RelatedPartyTransactionAxis_B0ABFDC56A399725CB009896C2A4B800" xlink:type="arc" />
    <link:label id="lab_us-gaap_RelatedPartyTransactionDomain_ADE4082CC4C8929FC1149896C2A498FD_terseLabel_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionDomain_ADE4082CC4C8929FC1149896C2A498FD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Related Party Transaction [Domain]</link:label>
    <link:label id="lab_us-gaap_RelatedPartyTransactionDomain_ADE4082CC4C8929FC1149896C2A498FD_label_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionDomain_ADE4082CC4C8929FC1149896C2A498FD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party Transaction [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RelatedPartyTransactionDomain" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_ADE4082CC4C8929FC1149896C2A498FD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_ADE4082CC4C8929FC1149896C2A498FD" xlink:to="lab_us-gaap_RelatedPartyTransactionDomain_ADE4082CC4C8929FC1149896C2A498FD" xlink:type="arc" />
    <link:label id="lab_oas_A2019CapitalExpendituresArrangementMember_FAFCF289F485B1138CC09896C2A45645_terseLabel_en-US" xlink:label="lab_oas_A2019CapitalExpendituresArrangementMember_FAFCF289F485B1138CC09896C2A45645" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019 Capital Expenditures Arrangement</link:label>
    <link:label id="lab_oas_A2019CapitalExpendituresArrangementMember_FAFCF289F485B1138CC09896C2A45645_label_en-US" xlink:label="lab_oas_A2019CapitalExpendituresArrangementMember_FAFCF289F485B1138CC09896C2A45645" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">2019 Capital Expenditures Arrangement [Member]</link:label>
    <link:label id="lab_oas_A2019CapitalExpendituresArrangementMember_FAFCF289F485B1138CC09896C2A45645_documentation_en-US" xlink:label="lab_oas_A2019CapitalExpendituresArrangementMember_FAFCF289F485B1138CC09896C2A45645" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">2019 Capital Expenditures Arrangement [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_A2019CapitalExpendituresArrangementMember" xlink:label="loc_oas_A2019CapitalExpendituresArrangementMember_FAFCF289F485B1138CC09896C2A45645" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_A2019CapitalExpendituresArrangementMember_FAFCF289F485B1138CC09896C2A45645" xlink:to="lab_oas_A2019CapitalExpendituresArrangementMember_FAFCF289F485B1138CC09896C2A45645" xlink:type="arc" />
    <link:label id="lab_dei_LegalEntityAxis_1F551A28446F2EC3155F9896C2A50D7A_terseLabel_en-US" xlink:label="lab_dei_LegalEntityAxis_1F551A28446F2EC3155F9896C2A50D7A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Legal Entity [Axis]</link:label>
    <link:label id="lab_dei_LegalEntityAxis_1F551A28446F2EC3155F9896C2A50D7A_label_en-US" xlink:label="lab_dei_LegalEntityAxis_1F551A28446F2EC3155F9896C2A50D7A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Legal Entity [Axis]</link:label>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_1F551A28446F2EC3155F9896C2A50D7A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_LegalEntityAxis_1F551A28446F2EC3155F9896C2A50D7A" xlink:to="lab_dei_LegalEntityAxis_1F551A28446F2EC3155F9896C2A50D7A" xlink:type="arc" />
    <link:label id="lab_dei_EntityDomain_07C6308AD1CCEAC0BEF39896C2A5EC0B_terseLabel_en-US" xlink:label="lab_dei_EntityDomain_07C6308AD1CCEAC0BEF39896C2A5EC0B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity [Domain]</link:label>
    <link:label id="lab_dei_EntityDomain_07C6308AD1CCEAC0BEF39896C2A5EC0B_label_en-US" xlink:label="lab_dei_EntityDomain_07C6308AD1CCEAC0BEF39896C2A5EC0B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity [Domain]</link:label>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_07C6308AD1CCEAC0BEF39896C2A5EC0B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityDomain_07C6308AD1CCEAC0BEF39896C2A5EC0B" xlink:to="lab_dei_EntityDomain_07C6308AD1CCEAC0BEF39896C2A5EC0B" xlink:type="arc" />
    <link:label id="lab_oas_OMSHoldingsLLCOMSMember_290974A4750C5ADDCC149896C2A58237_terseLabel_en-US" xlink:label="lab_oas_OMSHoldingsLLCOMSMember_290974A4750C5ADDCC149896C2A58237" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">OMS Holdings LLC (&#8220;OMS&#8221;)</link:label>
    <link:label id="lab_oas_OMSHoldingsLLCOMSMember_290974A4750C5ADDCC149896C2A58237_label_en-US" xlink:label="lab_oas_OMSHoldingsLLCOMSMember_290974A4750C5ADDCC149896C2A58237" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">OMS Holdings LLC (&#8220;OMS&#8221;) [Member]</link:label>
    <link:label id="lab_oas_OMSHoldingsLLCOMSMember_290974A4750C5ADDCC149896C2A58237_documentation_en-US" xlink:label="lab_oas_OMSHoldingsLLCOMSMember_290974A4750C5ADDCC149896C2A58237" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">OMS Holdings LLC (&#8220;OMS&#8221;) [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_OMSHoldingsLLCOMSMember" xlink:label="loc_oas_OMSHoldingsLLCOMSMember_290974A4750C5ADDCC149896C2A58237" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_OMSHoldingsLLCOMSMember_290974A4750C5ADDCC149896C2A58237" xlink:to="lab_oas_OMSHoldingsLLCOMSMember_290974A4750C5ADDCC149896C2A58237" xlink:type="arc" />
    <link:label id="lab_oas_OasisMidstreamPartnersLPMember_D43C32AE0ED1420308289896C2A5558D_terseLabel_en-US" xlink:label="lab_oas_OasisMidstreamPartnersLPMember_D43C32AE0ED1420308289896C2A5558D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Oasis Midstream Partners, LP</link:label>
    <link:label id="lab_oas_OasisMidstreamPartnersLPMember_D43C32AE0ED1420308289896C2A5558D_label_en-US" xlink:label="lab_oas_OasisMidstreamPartnersLPMember_D43C32AE0ED1420308289896C2A5558D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Oasis Midstream Partners, LP [Member]</link:label>
    <link:label id="lab_oas_OasisMidstreamPartnersLPMember_D43C32AE0ED1420308289896C2A5558D_documentation_en-US" xlink:label="lab_oas_OasisMidstreamPartnersLPMember_D43C32AE0ED1420308289896C2A5558D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Oasis Midstream Partners, LP [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_OasisMidstreamPartnersLPMember" xlink:label="loc_oas_OasisMidstreamPartnersLPMember_D43C32AE0ED1420308289896C2A5558D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_OasisMidstreamPartnersLPMember_D43C32AE0ED1420308289896C2A5558D" xlink:to="lab_oas_OasisMidstreamPartnersLPMember_D43C32AE0ED1420308289896C2A5558D" xlink:type="arc" />
    <link:label id="lab_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_822478444CF8B32620889896C2A5C559_terseLabel_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_822478444CF8B32620889896C2A5C559" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Related Party [Axis]</link:label>
    <link:label id="lab_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_822478444CF8B32620889896C2A5C559_label_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_822478444CF8B32620889896C2A5C559" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_822478444CF8B32620889896C2A5C559" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_822478444CF8B32620889896C2A5C559" xlink:to="lab_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_822478444CF8B32620889896C2A5C559" xlink:type="arc" />
    <link:label id="lab_us-gaap_RelatedPartyDomain_A2E4594939061FAC40FB9896C2A5E703_terseLabel_en-US" xlink:label="lab_us-gaap_RelatedPartyDomain_A2E4594939061FAC40FB9896C2A5E703" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Related Party [Domain]</link:label>
    <link:label id="lab_us-gaap_RelatedPartyDomain_A2E4594939061FAC40FB9896C2A5E703_label_en-US" xlink:label="lab_us-gaap_RelatedPartyDomain_A2E4594939061FAC40FB9896C2A5E703" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_A2E4594939061FAC40FB9896C2A5E703" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RelatedPartyDomain_A2E4594939061FAC40FB9896C2A5E703" xlink:to="lab_us-gaap_RelatedPartyDomain_A2E4594939061FAC40FB9896C2A5E703" xlink:type="arc" />
    <link:label id="lab_srt_AffiliatedEntityMember_517092EA19E3FD5C12449896C2A6C07C_terseLabel_en-US" xlink:label="lab_srt_AffiliatedEntityMember_517092EA19E3FD5C12449896C2A6C07C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">OMP</link:label>
    <link:label id="lab_srt_AffiliatedEntityMember_517092EA19E3FD5C12449896C2A6C07C_label_en-US" xlink:label="lab_srt_AffiliatedEntityMember_517092EA19E3FD5C12449896C2A6C07C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Affiliated Entity [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_AffiliatedEntityMember" xlink:label="loc_srt_AffiliatedEntityMember_517092EA19E3FD5C12449896C2A6C07C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_AffiliatedEntityMember_517092EA19E3FD5C12449896C2A6C07C" xlink:to="lab_srt_AffiliatedEntityMember_517092EA19E3FD5C12449896C2A6C07C" xlink:type="arc" />
    <link:label id="lab_us-gaap_RelatedPartyTransactionLineItems_61517475B556A236DDBC9896C2A609D2_terseLabel_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionLineItems_61517475B556A236DDBC9896C2A609D2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Related Party Transaction [Line Items]</link:label>
    <link:label id="lab_us-gaap_RelatedPartyTransactionLineItems_61517475B556A236DDBC9896C2A609D2_label_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionLineItems_61517475B556A236DDBC9896C2A609D2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party Transaction [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RelatedPartyTransactionLineItems" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_61517475B556A236DDBC9896C2A609D2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_61517475B556A236DDBC9896C2A609D2" xlink:to="lab_us-gaap_RelatedPartyTransactionLineItems_61517475B556A236DDBC9896C2A609D2" xlink:type="arc" />
    <link:label id="lab_us-gaap_RelatedPartyTransactionAmountsOfTransaction_7FEFDBB985368257CE9C9896C2A6DA83_terseLabel_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionAmountsOfTransaction_7FEFDBB985368257CE9C9896C2A6DA83" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Capital contributions under MOU</link:label>
    <link:label id="lab_us-gaap_RelatedPartyTransactionAmountsOfTransaction_7FEFDBB985368257CE9C9896C2A6DA83_label_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionAmountsOfTransaction_7FEFDBB985368257CE9C9896C2A6DA83" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party Transaction, Amounts of Transaction</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RelatedPartyTransactionAmountsOfTransaction" xlink:label="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_7FEFDBB985368257CE9C9896C2A6DA83" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_7FEFDBB985368257CE9C9896C2A6DA83" xlink:to="lab_us-gaap_RelatedPartyTransactionAmountsOfTransaction_7FEFDBB985368257CE9C9896C2A6DA83" xlink:type="arc" />
    <link:label id="lab_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_65AC93F51941F1D4169A9896C2A6B200_terseLabel_en-US" xlink:label="lab_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_65AC93F51941F1D4169A9896C2A6B200" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Ownership interest (percent)</link:label>
    <link:label id="lab_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_65AC93F51941F1D4169A9896C2A6B200_label_en-US" xlink:label="lab_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_65AC93F51941F1D4169A9896C2A6B200" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_65AC93F51941F1D4169A9896C2A6B200" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_65AC93F51941F1D4169A9896C2A6B200" xlink:to="lab_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_65AC93F51941F1D4169A9896C2A6B200" xlink:type="arc" />
    <link:label id="lab_us-gaap_LeaseCostTableTextBlock_A973E57781D6D9726EC478B438ED2F91_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseCostTableTextBlock_A973E57781D6D9726EC478B438ED2F91" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Components of lease expense, supplemental cash flow information and non-cash transactions related to Company's leases</link:label>
    <link:label id="lab_us-gaap_LeaseCostTableTextBlock_A973E57781D6D9726EC478B438ED2F91_label_en-US" xlink:label="lab_us-gaap_LeaseCostTableTextBlock_A973E57781D6D9726EC478B438ED2F91" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease, Cost [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LeaseCostTableTextBlock" xlink:label="loc_us-gaap_LeaseCostTableTextBlock_A973E57781D6D9726EC478B438ED2F91" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseCostTableTextBlock_A973E57781D6D9726EC478B438ED2F91" xlink:to="lab_us-gaap_LeaseCostTableTextBlock_A973E57781D6D9726EC478B438ED2F91" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_47AFC442927893EC38AD78B57934FF23_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_47AFC442927893EC38AD78B57934FF23" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maturities of the Company's lease liabilities</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_47AFC442927893EC38AD78B57934FF23_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_47AFC442927893EC38AD78B57934FF23" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Maturity [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock" xlink:label="loc_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_47AFC442927893EC38AD78B57934FF23" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_47AFC442927893EC38AD78B57934FF23" xlink:to="lab_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_47AFC442927893EC38AD78B57934FF23" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_55FB528E773E100988DE78B4CB69AA16_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_55FB528E773E100988DE78B4CB69AA16" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maturities of the Company's lease liabilities</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_55FB528E773E100988DE78B4CB69AA16_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_55FB528E773E100988DE78B4CB69AA16" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, Maturity [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_55FB528E773E100988DE78B4CB69AA16" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_55FB528E773E100988DE78B4CB69AA16" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_55FB528E773E100988DE78B4CB69AA16" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_8A887F9387D5287C2FE278B682AD7019_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_8A887F9387D5287C2FE278B682AD7019" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of future minimum annual rental commitments</link:label>
    <link:label id="lab_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_8A887F9387D5287C2FE278B682AD7019_label_en-US" xlink:label="lab_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_8A887F9387D5287C2FE278B682AD7019" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_8A887F9387D5287C2FE278B682AD7019" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_8A887F9387D5287C2FE278B682AD7019" xlink:to="lab_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_8A887F9387D5287C2FE278B682AD7019" xlink:type="arc" />
    <link:label id="lab_oas_AssetsAndLiabilitiesLesseeTableTextBlock_80A28401E7BB88ED68B478B7F9FCFE36_terseLabel_en-US" xlink:label="lab_oas_AssetsAndLiabilitiesLesseeTableTextBlock_80A28401E7BB88ED68B478B7F9FCFE36" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Supplemental balance sheet information</link:label>
    <link:label id="lab_oas_AssetsAndLiabilitiesLesseeTableTextBlock_80A28401E7BB88ED68B478B7F9FCFE36_label_en-US" xlink:label="lab_oas_AssetsAndLiabilitiesLesseeTableTextBlock_80A28401E7BB88ED68B478B7F9FCFE36" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets And Liabilities, Lessee [Table Text Block]</link:label>
    <link:label id="lab_oas_AssetsAndLiabilitiesLesseeTableTextBlock_80A28401E7BB88ED68B478B7F9FCFE36_documentation_en-US" xlink:label="lab_oas_AssetsAndLiabilitiesLesseeTableTextBlock_80A28401E7BB88ED68B478B7F9FCFE36" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Assets And Liabilities, Lessee [Table Text Block]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_AssetsAndLiabilitiesLesseeTableTextBlock" xlink:label="loc_oas_AssetsAndLiabilitiesLesseeTableTextBlock_80A28401E7BB88ED68B478B7F9FCFE36" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_AssetsAndLiabilitiesLesseeTableTextBlock_80A28401E7BB88ED68B478B7F9FCFE36" xlink:to="lab_oas_AssetsAndLiabilitiesLesseeTableTextBlock_80A28401E7BB88ED68B478B7F9FCFE36" xlink:type="arc" />
    <link:label id="lab_oas_LesseeFinanceLeaseDisclosureTableTextBlock_1CB0ED259F6C0E5BBC4678B8AE1AA661_terseLabel_en-US" xlink:label="lab_oas_LesseeFinanceLeaseDisclosureTableTextBlock_1CB0ED259F6C0E5BBC4678B8AE1AA661" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted-average remaining lease term and discount rate for the Company&#8217;s leases</link:label>
    <link:label id="lab_oas_LesseeFinanceLeaseDisclosureTableTextBlock_1CB0ED259F6C0E5BBC4678B8AE1AA661_label_en-US" xlink:label="lab_oas_LesseeFinanceLeaseDisclosureTableTextBlock_1CB0ED259F6C0E5BBC4678B8AE1AA661" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Finance Lease, Disclosure [Table Text Block]</link:label>
    <link:label id="lab_oas_LesseeFinanceLeaseDisclosureTableTextBlock_1CB0ED259F6C0E5BBC4678B8AE1AA661_documentation_en-US" xlink:label="lab_oas_LesseeFinanceLeaseDisclosureTableTextBlock_1CB0ED259F6C0E5BBC4678B8AE1AA661" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Lessee, Finance Lease, Disclosure [Table Text Block]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_LesseeFinanceLeaseDisclosureTableTextBlock" xlink:label="loc_oas_LesseeFinanceLeaseDisclosureTableTextBlock_1CB0ED259F6C0E5BBC4678B8AE1AA661" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_LesseeFinanceLeaseDisclosureTableTextBlock_1CB0ED259F6C0E5BBC4678B8AE1AA661" xlink:to="lab_oas_LesseeFinanceLeaseDisclosureTableTextBlock_1CB0ED259F6C0E5BBC4678B8AE1AA661" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccountingPoliciesAbstract_18A8427EFAD15EEE12928E86D84CBE0B_label_en-US" xlink:label="lab_us-gaap_AccountingPoliciesAbstract_18A8427EFAD15EEE12928E86D84CBE0B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounting Policies [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_18A8427EFAD15EEE12928E86D84CBE0B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_18A8427EFAD15EEE12928E86D84CBE0B" xlink:to="lab_us-gaap_AccountingPoliciesAbstract_18A8427EFAD15EEE12928E86D84CBE0B" xlink:type="arc" />
    <link:label id="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_7CB0EF64E06FEAECB8448E86D84CA155_terseLabel_en-US" xlink:label="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_7CB0EF64E06FEAECB8448E86D84CA155" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basis of Presentation</link:label>
    <link:label id="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_7CB0EF64E06FEAECB8448E86D84CA155_label_en-US" xlink:label="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_7CB0EF64E06FEAECB8448E86D84CA155" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Basis of Accounting, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:label="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_7CB0EF64E06FEAECB8448E86D84CA155" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_7CB0EF64E06FEAECB8448E86D84CA155" xlink:to="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_7CB0EF64E06FEAECB8448E86D84CA155" xlink:type="arc" />
    <link:label id="lab_us-gaap_ConsolidationPolicyTextBlock_6F4688E19E407850A3A38E86D84C468A_terseLabel_en-US" xlink:label="lab_us-gaap_ConsolidationPolicyTextBlock_6F4688E19E407850A3A38E86D84C468A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consolidation</link:label>
    <link:label id="lab_us-gaap_ConsolidationPolicyTextBlock_6F4688E19E407850A3A38E86D84C468A_label_en-US" xlink:label="lab_us-gaap_ConsolidationPolicyTextBlock_6F4688E19E407850A3A38E86D84C468A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Consolidation, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ConsolidationPolicyTextBlock" xlink:label="loc_us-gaap_ConsolidationPolicyTextBlock_6F4688E19E407850A3A38E86D84C468A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConsolidationPolicyTextBlock_6F4688E19E407850A3A38E86D84C468A" xlink:to="lab_us-gaap_ConsolidationPolicyTextBlock_6F4688E19E407850A3A38E86D84C468A" xlink:type="arc" />
    <link:label id="lab_oas_RisksandUncertaintiesPolicyPolicyTextBlock_CBCA6A1BB239F0BF00298E86D84D0F5B_terseLabel_en-US" xlink:label="lab_oas_RisksandUncertaintiesPolicyPolicyTextBlock_CBCA6A1BB239F0BF00298E86D84D0F5B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Risks and Uncertainties</link:label>
    <link:label id="lab_oas_RisksandUncertaintiesPolicyPolicyTextBlock_CBCA6A1BB239F0BF00298E86D84D0F5B_label_en-US" xlink:label="lab_oas_RisksandUncertaintiesPolicyPolicyTextBlock_CBCA6A1BB239F0BF00298E86D84D0F5B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Risks and Uncertainties Policy [Policy Text Block]</link:label>
    <link:label id="lab_oas_RisksandUncertaintiesPolicyPolicyTextBlock_CBCA6A1BB239F0BF00298E86D84D0F5B_documentation_en-US" xlink:label="lab_oas_RisksandUncertaintiesPolicyPolicyTextBlock_CBCA6A1BB239F0BF00298E86D84D0F5B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Risks and Uncertainties Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_RisksandUncertaintiesPolicyPolicyTextBlock" xlink:label="loc_oas_RisksandUncertaintiesPolicyPolicyTextBlock_CBCA6A1BB239F0BF00298E86D84D0F5B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_RisksandUncertaintiesPolicyPolicyTextBlock_CBCA6A1BB239F0BF00298E86D84D0F5B" xlink:to="lab_oas_RisksandUncertaintiesPolicyPolicyTextBlock_CBCA6A1BB239F0BF00298E86D84D0F5B" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeLeasesPolicyTextBlock_715ADB9034B4F93D22B98E86D84D1F51_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeLeasesPolicyTextBlock_715ADB9034B4F93D22B98E86D84D1F51" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Leases</link:label>
    <link:label id="lab_us-gaap_LesseeLeasesPolicyTextBlock_715ADB9034B4F93D22B98E86D84D1F51_label_en-US" xlink:label="lab_us-gaap_LesseeLeasesPolicyTextBlock_715ADB9034B4F93D22B98E86D84D1F51" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Leases [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeLeasesPolicyTextBlock" xlink:label="loc_us-gaap_LesseeLeasesPolicyTextBlock_715ADB9034B4F93D22B98E86D84D1F51" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeLeasesPolicyTextBlock_715ADB9034B4F93D22B98E86D84D1F51" xlink:to="lab_us-gaap_LesseeLeasesPolicyTextBlock_715ADB9034B4F93D22B98E86D84D1F51" xlink:type="arc" />
    <link:label id="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_3871DF83464BBA6DC2078E86D84D9711_terseLabel_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_3871DF83464BBA6DC2078E86D84D9711" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Recent Accounting Pronouncements</link:label>
    <link:label id="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_3871DF83464BBA6DC2078E86D84D9711_label_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_3871DF83464BBA6DC2078E86D84D9711" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">New Accounting Pronouncements, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" xlink:label="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_3871DF83464BBA6DC2078E86D84D9711" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_3871DF83464BBA6DC2078E86D84D9711" xlink:to="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_3871DF83464BBA6DC2078E86D84D9711" xlink:type="arc" />
    <link:label id="lab_us-gaap_InventoryPolicyTextBlock_CE2C0512DB721E875BD28E86D84D9512_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryPolicyTextBlock_CE2C0512DB721E875BD28E86D84D9512" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Inventory</link:label>
    <link:label id="lab_us-gaap_InventoryPolicyTextBlock_CE2C0512DB721E875BD28E86D84D9512_label_en-US" xlink:label="lab_us-gaap_InventoryPolicyTextBlock_CE2C0512DB721E875BD28E86D84D9512" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryPolicyTextBlock" xlink:label="loc_us-gaap_InventoryPolicyTextBlock_CE2C0512DB721E875BD28E86D84D9512" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryPolicyTextBlock_CE2C0512DB721E875BD28E86D84D9512" xlink:to="lab_us-gaap_InventoryPolicyTextBlock_CE2C0512DB721E875BD28E86D84D9512" xlink:type="arc" />
    <link:label id="lab_us-gaap_EffectiveIncomeTaxRateContinuingOperations_CD795272C716E54EE7657A57D4D83A71_terseLabel_en-US" xlink:label="lab_us-gaap_EffectiveIncomeTaxRateContinuingOperations_CD795272C716E54EE7657A57D4D83A71" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Effective tax rate (as percent)</link:label>
    <link:label id="lab_us-gaap_EffectiveIncomeTaxRateContinuingOperations_CD795272C716E54EE7657A57D4D83A71_label_en-US" xlink:label="lab_us-gaap_EffectiveIncomeTaxRateContinuingOperations_CD795272C716E54EE7657A57D4D83A71" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Effective Income Tax Rate Reconciliation, Percent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_CD795272C716E54EE7657A57D4D83A71" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_CD795272C716E54EE7657A57D4D83A71" xlink:to="lab_us-gaap_EffectiveIncomeTaxRateContinuingOperations_CD795272C716E54EE7657A57D4D83A71" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_EBA13FCB14C7DFC1FF3C7A57D4D84523_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_EBA13FCB14C7DFC1FF3C7A57D4D84523" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pre-tax income (loss)</link:label>
    <link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_EBA13FCB14C7DFC1FF3C7A57D4D84523_label_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_EBA13FCB14C7DFC1FF3C7A57D4D84523" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_EBA13FCB14C7DFC1FF3C7A57D4D84523" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_EBA13FCB14C7DFC1FF3C7A57D4D84523" xlink:to="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_EBA13FCB14C7DFC1FF3C7A57D4D84523" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_5EE5EFAF52771052B7467A2A5E05BF5C_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_5EE5EFAF52771052B7467A2A5E05BF5C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_5EE5EFAF52771052B7467A2A5E05BF5C_label_en-US" xlink:label="lab_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_5EE5EFAF52771052B7467A2A5E05BF5C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_5EE5EFAF52771052B7467A2A5E05BF5C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_5EE5EFAF52771052B7467A2A5E05BF5C" xlink:to="lab_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_5EE5EFAF52771052B7467A2A5E05BF5C" xlink:type="arc" />
    <link:label id="lab_us-gaap_AwardTypeAxis_DADC78B05E9B7932F2E17A2A5E057F0C_terseLabel_en-US" xlink:label="lab_us-gaap_AwardTypeAxis_DADC78B05E9B7932F2E17A2A5E057F0C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Award Type [Axis]</link:label>
    <link:label id="lab_us-gaap_AwardTypeAxis_DADC78B05E9B7932F2E17A2A5E057F0C_label_en-US" xlink:label="lab_us-gaap_AwardTypeAxis_DADC78B05E9B7932F2E17A2A5E057F0C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Award Type [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_DADC78B05E9B7932F2E17A2A5E057F0C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AwardTypeAxis_DADC78B05E9B7932F2E17A2A5E057F0C" xlink:to="lab_us-gaap_AwardTypeAxis_DADC78B05E9B7932F2E17A2A5E057F0C" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_54FCEE992C59D6BAC8B77A2A5E051A41_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_54FCEE992C59D6BAC8B77A2A5E051A41" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Award Type [Domain]</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_54FCEE992C59D6BAC8B77A2A5E051A41_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_54FCEE992C59D6BAC8B77A2A5E051A41" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Award [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_54FCEE992C59D6BAC8B77A2A5E051A41" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_54FCEE992C59D6BAC8B77A2A5E051A41" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_54FCEE992C59D6BAC8B77A2A5E051A41" xlink:type="arc" />
    <link:label id="lab_oas_RestrictedStockAwardsandPerformanceStockUnitsMember_59038C261505E1728B837A2A5E0674C8_terseLabel_en-US" xlink:label="lab_oas_RestrictedStockAwardsandPerformanceStockUnitsMember_59038C261505E1728B837A2A5E0674C8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restricted Stock Awards and PSUs</link:label>
    <link:label id="lab_oas_RestrictedStockAwardsandPerformanceStockUnitsMember_59038C261505E1728B837A2A5E0674C8_label_en-US" xlink:label="lab_oas_RestrictedStockAwardsandPerformanceStockUnitsMember_59038C261505E1728B837A2A5E0674C8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restricted Stock Awards and Performance Stock Units [Member]</link:label>
    <link:label id="lab_oas_RestrictedStockAwardsandPerformanceStockUnitsMember_59038C261505E1728B837A2A5E0674C8_documentation_en-US" xlink:label="lab_oas_RestrictedStockAwardsandPerformanceStockUnitsMember_59038C261505E1728B837A2A5E0674C8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Restricted Stock Awards and Performance Stock Units [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_RestrictedStockAwardsandPerformanceStockUnitsMember" xlink:label="loc_oas_RestrictedStockAwardsandPerformanceStockUnitsMember_59038C261505E1728B837A2A5E0674C8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_RestrictedStockAwardsandPerformanceStockUnitsMember_59038C261505E1728B837A2A5E0674C8" xlink:to="lab_oas_RestrictedStockAwardsandPerformanceStockUnitsMember_59038C261505E1728B837A2A5E0674C8" xlink:type="arc" />
    <link:label id="lab_us-gaap_EarningsPerShareDilutedLineItems_2F66D060C9C81B6006E37A2A5E06E720_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareDilutedLineItems_2F66D060C9C81B6006E37A2A5E06E720" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareDilutedLineItems_2F66D060C9C81B6006E37A2A5E06E720_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareDilutedLineItems_2F66D060C9C81B6006E37A2A5E06E720" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EarningsPerShareDilutedLineItems" xlink:label="loc_us-gaap_EarningsPerShareDilutedLineItems_2F66D060C9C81B6006E37A2A5E06E720" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_2F66D060C9C81B6006E37A2A5E06E720" xlink:to="lab_us-gaap_EarningsPerShareDilutedLineItems_2F66D060C9C81B6006E37A2A5E06E720" xlink:type="arc" />
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_3AAB11E60F2E084CAD107A2A5E06F0CD_verboseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_3AAB11E60F2E084CAD107A2A5E06F0CD" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Basic weighted average common shares outstanding (in shares)</link:label>
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_3AAB11E60F2E084CAD107A2A5E06F0CD_label_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_3AAB11E60F2E084CAD107A2A5E06F0CD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Number of Shares Outstanding, Basic</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_3AAB11E60F2E084CAD107A2A5E06F0CD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_3AAB11E60F2E084CAD107A2A5E06F0CD" xlink:to="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_3AAB11E60F2E084CAD107A2A5E06F0CD" xlink:type="arc" />
    <link:label id="lab_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_A3D8DAB22BF28F1A731B7A45CC08A363_terseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_A3D8DAB22BF28F1A731B7A45CC08A363" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount</link:label>
    <link:label id="lab_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_A3D8DAB22BF28F1A731B7A45CC08A363_label_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_A3D8DAB22BF28F1A731B7A45CC08A363" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Number Diluted Shares Outstanding Adjustment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment" xlink:label="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_A3D8DAB22BF28F1A731B7A45CC08A363" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_A3D8DAB22BF28F1A731B7A45CC08A363" xlink:to="lab_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_A3D8DAB22BF28F1A731B7A45CC08A363" xlink:type="arc" />
    <link:label id="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_04F6C9E8E91278A42A2B7A2A5E079D2C_totalLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_04F6C9E8E91278A42A2B7A2A5E079D2C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Diluted weighted average common shares outstanding (in shares)</link:label>
    <link:label id="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_04F6C9E8E91278A42A2B7A2A5E079D2C_label_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_04F6C9E8E91278A42A2B7A2A5E079D2C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Number of Shares Outstanding, Diluted</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_04F6C9E8E91278A42A2B7A2A5E079D2C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_04F6C9E8E91278A42A2B7A2A5E079D2C" xlink:to="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_04F6C9E8E91278A42A2B7A2A5E079D2C" xlink:type="arc" />
    <link:label id="lab_us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract_9012D060CB43188AE4B8602EBEF7C9F7_label_en-US" xlink:label="lab_us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract_9012D060CB43188AE4B8602EBEF7C9F7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Discontinued Operations and Disposal Groups [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract" xlink:label="loc_us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract_9012D060CB43188AE4B8602EBEF7C9F7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract_9012D060CB43188AE4B8602EBEF7C9F7" xlink:to="lab_us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract_9012D060CB43188AE4B8602EBEF7C9F7" xlink:type="arc" />
    <link:label id="lab_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock_82C15EA43CC16A69265F602EBEF775D0_terseLabel_en-US" xlink:label="lab_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock_82C15EA43CC16A69265F602EBEF775D0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Divestitures</link:label>
    <link:label id="lab_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock_82C15EA43CC16A69265F602EBEF775D0_label_en-US" xlink:label="lab_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock_82C15EA43CC16A69265F602EBEF775D0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock_82C15EA43CC16A69265F602EBEF775D0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock_82C15EA43CC16A69265F602EBEF775D0" xlink:to="lab_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock_82C15EA43CC16A69265F602EBEF775D0" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_3EE34E2D77E9EBE7E3F9602EBF5AF0AB_label_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_3EE34E2D77E9EBE7E3F9602EBF5AF0AB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Instruments and Hedging Activities Disclosure [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_3EE34E2D77E9EBE7E3F9602EBF5AF0AB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_3EE34E2D77E9EBE7E3F9602EBF5AF0AB" xlink:to="lab_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_3EE34E2D77E9EBE7E3F9602EBF5AF0AB" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfDerivativeInstrumentsTextBlock_6111A1D9BEBE140A5713602EBF5A46F1_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfDerivativeInstrumentsTextBlock_6111A1D9BEBE140A5713602EBF5A46F1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Outstanding Commodity Derivative Instruments</link:label>
    <link:label id="lab_us-gaap_ScheduleOfDerivativeInstrumentsTextBlock_6111A1D9BEBE140A5713602EBF5A46F1_label_en-US" xlink:label="lab_us-gaap_ScheduleOfDerivativeInstrumentsTextBlock_6111A1D9BEBE140A5713602EBF5A46F1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Derivative Instruments [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfDerivativeInstrumentsTextBlock" xlink:label="loc_us-gaap_ScheduleOfDerivativeInstrumentsTextBlock_6111A1D9BEBE140A5713602EBF5A46F1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfDerivativeInstrumentsTextBlock_6111A1D9BEBE140A5713602EBF5A46F1" xlink:to="lab_us-gaap_ScheduleOfDerivativeInstrumentsTextBlock_6111A1D9BEBE140A5713602EBF5A46F1" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfOtherDerivativesNotDesignatedAsHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock_90418B8B9A6DD889BCE3602EBF5A47D6_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfOtherDerivativesNotDesignatedAsHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock_90418B8B9A6DD889BCE3602EBF5A47D6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gains and Losses from Commodity Derivative Instruments</link:label>
    <link:label id="lab_us-gaap_ScheduleOfOtherDerivativesNotDesignatedAsHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock_90418B8B9A6DD889BCE3602EBF5A47D6_label_en-US" xlink:label="lab_us-gaap_ScheduleOfOtherDerivativesNotDesignatedAsHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock_90418B8B9A6DD889BCE3602EBF5A47D6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivatives Not Designated as Hedging Instruments [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfOtherDerivativesNotDesignatedAsHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfOtherDerivativesNotDesignatedAsHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock_90418B8B9A6DD889BCE3602EBF5A47D6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfOtherDerivativesNotDesignatedAsHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock_90418B8B9A6DD889BCE3602EBF5A47D6" xlink:to="lab_us-gaap_ScheduleOfOtherDerivativesNotDesignatedAsHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock_90418B8B9A6DD889BCE3602EBF5A47D6" xlink:type="arc" />
    <link:label id="lab_us-gaap_OffsettingAssetsTableTextBlock_4A190433B9070D6602D6602EBF5AD30B_terseLabel_en-US" xlink:label="lab_us-gaap_OffsettingAssetsTableTextBlock_4A190433B9070D6602D6602EBF5AD30B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of Gross and Net Information about Commodity Derivative Assets</link:label>
    <link:label id="lab_us-gaap_OffsettingAssetsTableTextBlock_4A190433B9070D6602D6602EBF5AD30B_label_en-US" xlink:label="lab_us-gaap_OffsettingAssetsTableTextBlock_4A190433B9070D6602D6602EBF5AD30B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Offsetting Assets [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OffsettingAssetsTableTextBlock" xlink:label="loc_us-gaap_OffsettingAssetsTableTextBlock_4A190433B9070D6602D6602EBF5AD30B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OffsettingAssetsTableTextBlock_4A190433B9070D6602D6602EBF5AD30B" xlink:to="lab_us-gaap_OffsettingAssetsTableTextBlock_4A190433B9070D6602D6602EBF5AD30B" xlink:type="arc" />
    <link:label id="lab_us-gaap_OffsettingLiabilitiesTableTextBlock_A140CD73875071368AFA602EBF5A5A49_terseLabel_en-US" xlink:label="lab_us-gaap_OffsettingLiabilitiesTableTextBlock_A140CD73875071368AFA602EBF5A5A49" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of Gross and Net Information about Commodity Derivative Liabilities</link:label>
    <link:label id="lab_us-gaap_OffsettingLiabilitiesTableTextBlock_A140CD73875071368AFA602EBF5A5A49_label_en-US" xlink:label="lab_us-gaap_OffsettingLiabilitiesTableTextBlock_A140CD73875071368AFA602EBF5A5A49" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Offsetting Liabilities [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OffsettingLiabilitiesTableTextBlock" xlink:label="loc_us-gaap_OffsettingLiabilitiesTableTextBlock_A140CD73875071368AFA602EBF5A5A49" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OffsettingLiabilitiesTableTextBlock_A140CD73875071368AFA602EBF5A5A49" xlink:to="lab_us-gaap_OffsettingLiabilitiesTableTextBlock_A140CD73875071368AFA602EBF5A5A49" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfChangeInAssetRetirementObligationTableTextBlock_5B62CF4CBBE6D18BCCA8602EBEA4550F_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfChangeInAssetRetirementObligationTableTextBlock_5B62CF4CBBE6D18BCCA8602EBEA4550F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Changes in Asset Retirement Obligations</link:label>
    <link:label id="lab_us-gaap_ScheduleOfChangeInAssetRetirementObligationTableTextBlock_5B62CF4CBBE6D18BCCA8602EBEA4550F_label_en-US" xlink:label="lab_us-gaap_ScheduleOfChangeInAssetRetirementObligationTableTextBlock_5B62CF4CBBE6D18BCCA8602EBEA4550F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Change in Asset Retirement Obligation [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfChangeInAssetRetirementObligationTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfChangeInAssetRetirementObligationTableTextBlock_5B62CF4CBBE6D18BCCA8602EBEA4550F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfChangeInAssetRetirementObligationTableTextBlock_5B62CF4CBBE6D18BCCA8602EBEA4550F" xlink:to="lab_us-gaap_ScheduleOfChangeInAssetRetirementObligationTableTextBlock_5B62CF4CBBE6D18BCCA8602EBEA4550F" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_13145C67CC041BAB271D8E86D8416B4F_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_13145C67CC041BAB271D8E86D8416B4F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Error Corrections and Prior Period Adjustment Restatement [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_13145C67CC041BAB271D8E86D8416B4F_label_en-US" xlink:label="lab_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_13145C67CC041BAB271D8E86D8416B4F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Error Corrections and Prior Period Adjustment Restatement [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable" xlink:label="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_13145C67CC041BAB271D8E86D8416B4F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_13145C67CC041BAB271D8E86D8416B4F" xlink:to="lab_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_13145C67CC041BAB271D8E86D8416B4F" xlink:type="arc" />
    <link:label id="lab_us-gaap_OilAndGasMember_30D56E9C76AEA778D0CA8E86D842DEA3_verboseLabel_en-US" xlink:label="lab_us-gaap_OilAndGasMember_30D56E9C76AEA778D0CA8E86D842DEA3" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Oil and gas revenues</link:label>
    <link:label id="lab_us-gaap_OilAndGasMember_30D56E9C76AEA778D0CA8E86D842DEA3_label_en-US" xlink:label="lab_us-gaap_OilAndGasMember_30D56E9C76AEA778D0CA8E86D842DEA3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Oil and Gas [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OilAndGasMember" xlink:label="loc_us-gaap_OilAndGasMember_30D56E9C76AEA778D0CA8E86D842DEA3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OilAndGasMember_30D56E9C76AEA778D0CA8E86D842DEA3" xlink:to="lab_us-gaap_OilAndGasMember_30D56E9C76AEA778D0CA8E86D842DEA3" xlink:type="arc" />
    <link:label id="lab_us-gaap_OilAndGasPurchasedMember_A6A517E56C1986F4F7F78E86D8423638_verboseLabel_en-US" xlink:label="lab_us-gaap_OilAndGasPurchasedMember_A6A517E56C1986F4F7F78E86D8423638" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Purchased oil and gas</link:label>
    <link:label id="lab_us-gaap_OilAndGasPurchasedMember_A6A517E56C1986F4F7F78E86D8423638_label_en-US" xlink:label="lab_us-gaap_OilAndGasPurchasedMember_A6A517E56C1986F4F7F78E86D8423638" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Oil and Gas, Purchased [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OilAndGasPurchasedMember" xlink:label="loc_us-gaap_OilAndGasPurchasedMember_A6A517E56C1986F4F7F78E86D8423638" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OilAndGasPurchasedMember_A6A517E56C1986F4F7F78E86D8423638" xlink:to="lab_us-gaap_OilAndGasPurchasedMember_A6A517E56C1986F4F7F78E86D8423638" xlink:type="arc" />
    <link:label id="lab_srt_RestatementAxis_97DDF5228DE9964D90348E86D8423212_terseLabel_en-US" xlink:label="lab_srt_RestatementAxis_97DDF5228DE9964D90348E86D8423212" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restatement [Axis]</link:label>
    <link:label id="lab_srt_RestatementAxis_97DDF5228DE9964D90348E86D8423212_label_en-US" xlink:label="lab_srt_RestatementAxis_97DDF5228DE9964D90348E86D8423212" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restatement [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RestatementAxis" xlink:label="loc_srt_RestatementAxis_97DDF5228DE9964D90348E86D8423212" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_RestatementAxis_97DDF5228DE9964D90348E86D8423212" xlink:to="lab_srt_RestatementAxis_97DDF5228DE9964D90348E86D8423212" xlink:type="arc" />
    <link:label id="lab_srt_RestatementDomain_1E774920697A0441B86C8E86D8436481_terseLabel_en-US" xlink:label="lab_srt_RestatementDomain_1E774920697A0441B86C8E86D8436481" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restatement [Domain]</link:label>
    <link:label id="lab_srt_RestatementDomain_1E774920697A0441B86C8E86D8436481_label_en-US" xlink:label="lab_srt_RestatementDomain_1E774920697A0441B86C8E86D8436481" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restatement [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RestatementDomain" xlink:label="loc_srt_RestatementDomain_1E774920697A0441B86C8E86D8436481" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_RestatementDomain_1E774920697A0441B86C8E86D8436481" xlink:to="lab_srt_RestatementDomain_1E774920697A0441B86C8E86D8436481" xlink:type="arc" />
    <link:label id="lab_srt_ScenarioPreviouslyReportedMember_CAB051AF399D31815FB28E86D8436B6B_terseLabel_en-US" xlink:label="lab_srt_ScenarioPreviouslyReportedMember_CAB051AF399D31815FB28E86D8436B6B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">As Reported</link:label>
    <link:label id="lab_srt_ScenarioPreviouslyReportedMember_CAB051AF399D31815FB28E86D8436B6B_label_en-US" xlink:label="lab_srt_ScenarioPreviouslyReportedMember_CAB051AF399D31815FB28E86D8436B6B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Previously Reported [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ScenarioPreviouslyReportedMember" xlink:label="loc_srt_ScenarioPreviouslyReportedMember_CAB051AF399D31815FB28E86D8436B6B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ScenarioPreviouslyReportedMember_CAB051AF399D31815FB28E86D8436B6B" xlink:to="lab_srt_ScenarioPreviouslyReportedMember_CAB051AF399D31815FB28E86D8436B6B" xlink:type="arc" />
    <link:label id="lab_srt_RestatementAdjustmentMember_E55CF7CB4FF8F0BF6CED8E86D8437B56_terseLabel_en-US" xlink:label="lab_srt_RestatementAdjustmentMember_E55CF7CB4FF8F0BF6CED8E86D8437B56" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revision</link:label>
    <link:label id="lab_srt_RestatementAdjustmentMember_E55CF7CB4FF8F0BF6CED8E86D8437B56_label_en-US" xlink:label="lab_srt_RestatementAdjustmentMember_E55CF7CB4FF8F0BF6CED8E86D8437B56" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restatement Adjustment [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RestatementAdjustmentMember" xlink:label="loc_srt_RestatementAdjustmentMember_E55CF7CB4FF8F0BF6CED8E86D8437B56" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_RestatementAdjustmentMember_E55CF7CB4FF8F0BF6CED8E86D8437B56" xlink:to="lab_srt_RestatementAdjustmentMember_E55CF7CB4FF8F0BF6CED8E86D8437B56" xlink:type="arc" />
    <link:label id="lab_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_83C01268F86A4548CD3B8E86D84361D3_terseLabel_en-US" xlink:label="lab_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_83C01268F86A4548CD3B8E86D84361D3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Error Corrections and Prior Period Adjustments Restatement [Line Items]</link:label>
    <link:label id="lab_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_83C01268F86A4548CD3B8E86D84361D3_label_en-US" xlink:label="lab_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_83C01268F86A4548CD3B8E86D84361D3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Error Corrections and Prior Period Adjustments Restatement [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems" xlink:label="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_83C01268F86A4548CD3B8E86D84361D3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_83C01268F86A4548CD3B8E86D84361D3" xlink:to="lab_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_83C01268F86A4548CD3B8E86D84361D3" xlink:type="arc" />
    <link:label id="lab_us-gaap_CostOfGoodsAndServicesSold_2F8B5AF151BF383960648E86D8442BEC_verboseLabel_en-US" xlink:label="lab_us-gaap_CostOfGoodsAndServicesSold_2F8B5AF151BF383960648E86D8442BEC" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Purchased oil and gas expenses</link:label>
    <link:label id="lab_us-gaap_CostOfGoodsAndServicesSold_2F8B5AF151BF383960648E86D8442BEC_label_en-US" xlink:label="lab_us-gaap_CostOfGoodsAndServicesSold_2F8B5AF151BF383960648E86D8442BEC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cost of Goods and Services Sold</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_2F8B5AF151BF383960648E86D8442BEC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostOfGoodsAndServicesSold_2F8B5AF151BF383960648E86D8442BEC" xlink:to="lab_us-gaap_CostOfGoodsAndServicesSold_2F8B5AF151BF383960648E86D8442BEC" xlink:type="arc" />
    <link:label id="lab_us-gaap_CostsAndExpenses_9C2D7960A5E905AE1F198E86D844FB73_terseLabel_en-US" xlink:label="lab_us-gaap_CostsAndExpenses_9C2D7960A5E905AE1F198E86D844FB73" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total operating expenses</link:label>
    <link:label id="lab_us-gaap_CostsAndExpenses_9C2D7960A5E905AE1F198E86D844FB73_label_en-US" xlink:label="lab_us-gaap_CostsAndExpenses_9C2D7960A5E905AE1F198E86D844FB73" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Costs and Expenses</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="loc_us-gaap_CostsAndExpenses_9C2D7960A5E905AE1F198E86D844FB73" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostsAndExpenses_9C2D7960A5E905AE1F198E86D844FB73" xlink:to="lab_us-gaap_CostsAndExpenses_9C2D7960A5E905AE1F198E86D844FB73" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetIncomeLoss_EA9FDDED9F7985686C598E86D8445C20_terseLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_EA9FDDED9F7985686C598E86D8445C20" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net income attributable to Oasis</link:label>
    <link:label id="lab_us-gaap_NetIncomeLoss_EA9FDDED9F7985686C598E86D8445C20_label_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_EA9FDDED9F7985686C598E86D8445C20" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Income (Loss) Attributable to Parent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_EA9FDDED9F7985686C598E86D8445C20" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetIncomeLoss_EA9FDDED9F7985686C598E86D8445C20" xlink:to="lab_us-gaap_NetIncomeLoss_EA9FDDED9F7985686C598E86D8445C20" xlink:type="arc" />
    <link:label id="lab_us-gaap_EarningsPerShareBasic_6FF08DA2D829083115B38E86D845FE32_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasic_6FF08DA2D829083115B38E86D845FE32" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basic (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareBasic_6FF08DA2D829083115B38E86D845FE32_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasic_6FF08DA2D829083115B38E86D845FE32" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share, Basic</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_6FF08DA2D829083115B38E86D845FE32" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareBasic_6FF08DA2D829083115B38E86D845FE32" xlink:to="lab_us-gaap_EarningsPerShareBasic_6FF08DA2D829083115B38E86D845FE32" xlink:type="arc" />
    <link:label id="lab_us-gaap_EarningsPerShareDiluted_609815C75116DF3CD0468E86D8458EC7_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareDiluted_609815C75116DF3CD0468E86D8458EC7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Diluted (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareDiluted_609815C75116DF3CD0468E86D8458EC7_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareDiluted_609815C75116DF3CD0468E86D8458EC7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share, Diluted</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_609815C75116DF3CD0468E86D8458EC7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareDiluted_609815C75116DF3CD0468E86D8458EC7" xlink:to="lab_us-gaap_EarningsPerShareDiluted_609815C75116DF3CD0468E86D8458EC7" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentAbstract_6E4CCAD2323BA9BF029879987AD46AAC_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentAbstract_6E4CCAD2323BA9BF029879987AD46AAC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAbstract" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAbstract_6E4CCAD2323BA9BF029879987AD46AAC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentAbstract_6E4CCAD2323BA9BF029879987AD46AAC" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentAbstract_6E4CCAD2323BA9BF029879987AD46AAC" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod_3704FFC861F21E7C1D0B79987AD49979_terseLabel_en-US" xlink:label="lab_us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod_3704FFC861F21E7C1D0B79987AD49979" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proved oil and gas properties</link:label>
    <link:label id="lab_us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod_3704FFC861F21E7C1D0B79987AD49979_label_en-US" xlink:label="lab_us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod_3704FFC861F21E7C1D0B79987AD49979" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proved Oil and Gas Property, Successful Effort Method</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod" xlink:label="loc_us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod_3704FFC861F21E7C1D0B79987AD49979" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod_3704FFC861F21E7C1D0B79987AD49979" xlink:to="lab_us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod_3704FFC861F21E7C1D0B79987AD49979" xlink:type="arc" />
    <link:label id="lab_us-gaap_OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization_3424711E03343917F1FB79987AD48186_negatedLabel_en-US" xlink:label="lab_us-gaap_OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization_3424711E03343917F1FB79987AD48186" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Less: Accumulated depreciation, depletion, amortization and impairment</link:label>
    <link:label id="lab_us-gaap_OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization_3424711E03343917F1FB79987AD48186_label_en-US" xlink:label="lab_us-gaap_OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization_3424711E03343917F1FB79987AD48186" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Oil and Gas Property, Successful Effort Method, Accumulated Depreciation, Depletion and Amortization</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization_3424711E03343917F1FB79987AD48186" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization_3424711E03343917F1FB79987AD48186" xlink:to="lab_us-gaap_OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization_3424711E03343917F1FB79987AD48186" xlink:type="arc" />
    <link:label id="lab_oas_ProvedOilAndGasPropertiesNet_573E40506E577287401179987AD49FC5_totalLabel_en-US" xlink:label="lab_oas_ProvedOilAndGasPropertiesNet_573E40506E577287401179987AD49FC5" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Proved oil and gas properties, net</link:label>
    <link:label id="lab_oas_ProvedOilAndGasPropertiesNet_573E40506E577287401179987AD49FC5_label_en-US" xlink:label="lab_oas_ProvedOilAndGasPropertiesNet_573E40506E577287401179987AD49FC5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proved Oil And Gas Properties Net</link:label>
    <link:label id="lab_oas_ProvedOilAndGasPropertiesNet_573E40506E577287401179987AD49FC5_documentation_en-US" xlink:label="lab_oas_ProvedOilAndGasPropertiesNet_573E40506E577287401179987AD49FC5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Oil and Gas properties with proved reserves under the successful effort method, net of accumulated depreciation, depletion, amortization and impairment.</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_ProvedOilAndGasPropertiesNet" xlink:label="loc_oas_ProvedOilAndGasPropertiesNet_573E40506E577287401179987AD49FC5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_ProvedOilAndGasPropertiesNet_573E40506E577287401179987AD49FC5" xlink:to="lab_oas_ProvedOilAndGasPropertiesNet_573E40506E577287401179987AD49FC5" xlink:type="arc" />
    <link:label id="lab_us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod_A36D0D0AC5EC58D7819B79987AD48329_terseLabel_en-US" xlink:label="lab_us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod_A36D0D0AC5EC58D7819B79987AD48329" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unproved oil and gas properties</link:label>
    <link:label id="lab_us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod_A36D0D0AC5EC58D7819B79987AD48329_label_en-US" xlink:label="lab_us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod_A36D0D0AC5EC58D7819B79987AD48329" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unproved Oil and Gas Property, Successful Effort Method</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod" xlink:label="loc_us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod_A36D0D0AC5EC58D7819B79987AD48329" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod_A36D0D0AC5EC58D7819B79987AD48329" xlink:to="lab_us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod_A36D0D0AC5EC58D7819B79987AD48329" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentOther_D04AD06D12B4A6E7C4E379987AE4CE33_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentOther_D04AD06D12B4A6E7C4E379987AE4CE33" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other property and equipment</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentOther_D04AD06D12B4A6E7C4E379987AE4CE33_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentOther_D04AD06D12B4A6E7C4E379987AE4CE33" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Other, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentOther" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentOther_D04AD06D12B4A6E7C4E379987AE4CE33" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentOther_D04AD06D12B4A6E7C4E379987AE4CE33" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentOther_D04AD06D12B4A6E7C4E379987AE4CE33" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentOtherAccumulatedDepreciation_EB2A6B62FCABC8DDCBA979987AE405AC_negatedLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentOtherAccumulatedDepreciation_EB2A6B62FCABC8DDCBA979987AE405AC" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Less: Accumulated depreciation</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentOtherAccumulatedDepreciation_EB2A6B62FCABC8DDCBA979987AE405AC_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentOtherAccumulatedDepreciation_EB2A6B62FCABC8DDCBA979987AE405AC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Other, Accumulated Depreciation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentOtherAccumulatedDepreciation" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentOtherAccumulatedDepreciation_EB2A6B62FCABC8DDCBA979987AE405AC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentOtherAccumulatedDepreciation_EB2A6B62FCABC8DDCBA979987AE405AC" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentOtherAccumulatedDepreciation_EB2A6B62FCABC8DDCBA979987AE405AC" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentOtherNet_AFD4AC877D1E281A3F4979987AE47530_totalLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentOtherNet_AFD4AC877D1E281A3F4979987AE47530" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Other property and equipment, net</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentOtherNet_AFD4AC877D1E281A3F4979987AE47530_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentOtherNet_AFD4AC877D1E281A3F4979987AE47530" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Other, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentOtherNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentOtherNet_AFD4AC877D1E281A3F4979987AE47530" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentOtherNet_AFD4AC877D1E281A3F4979987AE47530" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentOtherNet_AFD4AC877D1E281A3F4979987AE47530" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_26DA2C00A0A7D8F5C97379987AE4F5CC_totalLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_26DA2C00A0A7D8F5C97379987AE4F5CC" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total property, plant and equipment, net</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_26DA2C00A0A7D8F5C97379987AE4F5CC_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_26DA2C00A0A7D8F5C97379987AE4F5CC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_26DA2C00A0A7D8F5C97379987AE4F5CC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_26DA2C00A0A7D8F5C97379987AE4F5CC" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentNet_26DA2C00A0A7D8F5C97379987AE4F5CC" xlink:type="arc" />
    <link:label id="lab_us-gaap_SegmentReportingAbstract_7329B2130B76580B3D8D602EBE648689_label_en-US" xlink:label="lab_us-gaap_SegmentReportingAbstract_7329B2130B76580B3D8D602EBE648689" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segment Reporting [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentReportingAbstract" xlink:label="loc_us-gaap_SegmentReportingAbstract_7329B2130B76580B3D8D602EBE648689" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SegmentReportingAbstract_7329B2130B76580B3D8D602EBE648689" xlink:to="lab_us-gaap_SegmentReportingAbstract_7329B2130B76580B3D8D602EBE648689" xlink:type="arc" />
    <link:label id="lab_us-gaap_NumberOfOperatingSegments_F3410867F6A1F1DDAD24602EBE646087_terseLabel_en-US" xlink:label="lab_us-gaap_NumberOfOperatingSegments_F3410867F6A1F1DDAD24602EBE646087" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of current operating units</link:label>
    <link:label id="lab_us-gaap_NumberOfOperatingSegments_F3410867F6A1F1DDAD24602EBE646087_label_en-US" xlink:label="lab_us-gaap_NumberOfOperatingSegments_F3410867F6A1F1DDAD24602EBE646087" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Operating Segments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NumberOfOperatingSegments" xlink:label="loc_us-gaap_NumberOfOperatingSegments_F3410867F6A1F1DDAD24602EBE646087" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NumberOfOperatingSegments_F3410867F6A1F1DDAD24602EBE646087" xlink:to="lab_us-gaap_NumberOfOperatingSegments_F3410867F6A1F1DDAD24602EBE646087" xlink:type="arc" />
    <link:label id="lab_us-gaap_InventoryNetAbstract_84FD5093FC644EEB642F989715C51546_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryNetAbstract_84FD5093FC644EEB642F989715C51546" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Inventory</link:label>
    <link:label id="lab_us-gaap_InventoryNetAbstract_84FD5093FC644EEB642F989715C51546_label_en-US" xlink:label="lab_us-gaap_InventoryNetAbstract_84FD5093FC644EEB642F989715C51546" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Net [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryNetAbstract" xlink:label="loc_us-gaap_InventoryNetAbstract_84FD5093FC644EEB642F989715C51546" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryNetAbstract_84FD5093FC644EEB642F989715C51546" xlink:to="lab_us-gaap_InventoryNetAbstract_84FD5093FC644EEB642F989715C51546" xlink:type="arc" />
    <link:label id="lab_us-gaap_EnergyRelatedInventoryPetroleum_782659F4BEB3C5255F05989715C611E2_terseLabel_en-US" xlink:label="lab_us-gaap_EnergyRelatedInventoryPetroleum_782659F4BEB3C5255F05989715C611E2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Crude oil inventory</link:label>
    <link:label id="lab_us-gaap_EnergyRelatedInventoryPetroleum_782659F4BEB3C5255F05989715C611E2_label_en-US" xlink:label="lab_us-gaap_EnergyRelatedInventoryPetroleum_782659F4BEB3C5255F05989715C611E2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Energy Related Inventory, Petroleum</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EnergyRelatedInventoryPetroleum" xlink:label="loc_us-gaap_EnergyRelatedInventoryPetroleum_782659F4BEB3C5255F05989715C611E2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EnergyRelatedInventoryPetroleum_782659F4BEB3C5255F05989715C611E2" xlink:to="lab_us-gaap_EnergyRelatedInventoryPetroleum_782659F4BEB3C5255F05989715C611E2" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherInventorySupplies_A77EBCDE0DD712763D29989715C6777A_terseLabel_en-US" xlink:label="lab_us-gaap_OtherInventorySupplies_A77EBCDE0DD712763D29989715C6777A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equipment and materials</link:label>
    <link:label id="lab_us-gaap_OtherInventorySupplies_A77EBCDE0DD712763D29989715C6777A_label_en-US" xlink:label="lab_us-gaap_OtherInventorySupplies_A77EBCDE0DD712763D29989715C6777A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Inventory, Supplies, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherInventorySupplies" xlink:label="loc_us-gaap_OtherInventorySupplies_A77EBCDE0DD712763D29989715C6777A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherInventorySupplies_A77EBCDE0DD712763D29989715C6777A" xlink:to="lab_us-gaap_OtherInventorySupplies_A77EBCDE0DD712763D29989715C6777A" xlink:type="arc" />
    <link:label id="lab_us-gaap_InventoryNet_A4B2AD85A2DFFF026735989715C6B848_totalLabel_en-US" xlink:label="lab_us-gaap_InventoryNet_A4B2AD85A2DFFF026735989715C6B848" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total inventory</link:label>
    <link:label id="lab_us-gaap_InventoryNet_A4B2AD85A2DFFF026735989715C6B848_label_en-US" xlink:label="lab_us-gaap_InventoryNet_A4B2AD85A2DFFF026735989715C6B848" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_A4B2AD85A2DFFF026735989715C6B848" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryNet_A4B2AD85A2DFFF026735989715C6B848" xlink:to="lab_us-gaap_InventoryNet_A4B2AD85A2DFFF026735989715C6B848" xlink:type="arc" />
    <link:label id="lab_us-gaap_InventoryNoncurrentAbstract_9BA808223F2CC0E1F0B9989715C6D67D_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryNoncurrentAbstract_9BA808223F2CC0E1F0B9989715C6D67D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term inventory</link:label>
    <link:label id="lab_us-gaap_InventoryNoncurrentAbstract_9BA808223F2CC0E1F0B9989715C6D67D_label_en-US" xlink:label="lab_us-gaap_InventoryNoncurrentAbstract_9BA808223F2CC0E1F0B9989715C6D67D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Noncurrent [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryNoncurrentAbstract" xlink:label="loc_us-gaap_InventoryNoncurrentAbstract_9BA808223F2CC0E1F0B9989715C6D67D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryNoncurrentAbstract_9BA808223F2CC0E1F0B9989715C6D67D" xlink:to="lab_us-gaap_InventoryNoncurrentAbstract_9BA808223F2CC0E1F0B9989715C6D67D" xlink:type="arc" />
    <link:label id="lab_oas_InventoryNoncurrentLinefill_E569DAC5EABE4EB386B8989715C65B8D_terseLabel_en-US" xlink:label="lab_oas_InventoryNoncurrentLinefill_E569DAC5EABE4EB386B8989715C65B8D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Linefill in third party pipelines</link:label>
    <link:label id="lab_oas_InventoryNoncurrentLinefill_E569DAC5EABE4EB386B8989715C65B8D_label_en-US" xlink:label="lab_oas_InventoryNoncurrentLinefill_E569DAC5EABE4EB386B8989715C65B8D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Noncurrent, Linefill</link:label>
    <link:label id="lab_oas_InventoryNoncurrentLinefill_E569DAC5EABE4EB386B8989715C65B8D_documentation_en-US" xlink:label="lab_oas_InventoryNoncurrentLinefill_E569DAC5EABE4EB386B8989715C65B8D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Inventory, Noncurrent, Linefill</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_InventoryNoncurrentLinefill" xlink:label="loc_oas_InventoryNoncurrentLinefill_E569DAC5EABE4EB386B8989715C65B8D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_InventoryNoncurrentLinefill_E569DAC5EABE4EB386B8989715C65B8D" xlink:to="lab_oas_InventoryNoncurrentLinefill_E569DAC5EABE4EB386B8989715C65B8D" xlink:type="arc" />
    <link:label id="lab_us-gaap_InventoryNoncurrent_5970CFDF7437D4D702AF989715C74ED4_totalLabel_en-US" xlink:label="lab_us-gaap_InventoryNoncurrent_5970CFDF7437D4D702AF989715C74ED4" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total long-term inventory</link:label>
    <link:label id="lab_us-gaap_InventoryNoncurrent_5970CFDF7437D4D702AF989715C74ED4_label_en-US" xlink:label="lab_us-gaap_InventoryNoncurrent_5970CFDF7437D4D702AF989715C74ED4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryNoncurrent" xlink:label="loc_us-gaap_InventoryNoncurrent_5970CFDF7437D4D702AF989715C74ED4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryNoncurrent_5970CFDF7437D4D702AF989715C74ED4" xlink:to="lab_us-gaap_InventoryNoncurrent_5970CFDF7437D4D702AF989715C74ED4" xlink:type="arc" />
    <link:label id="lab_oas_InventoryCurrentandNoncurrent_5123547AC94FEFF6DD6E989715C75A7D_totalLabel_en-US" xlink:label="lab_oas_InventoryCurrentandNoncurrent_5123547AC94FEFF6DD6E989715C75A7D" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_oas_InventoryCurrentandNoncurrent_5123547AC94FEFF6DD6E989715C75A7D_label_en-US" xlink:label="lab_oas_InventoryCurrentandNoncurrent_5123547AC94FEFF6DD6E989715C75A7D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Current and Noncurrent</link:label>
    <link:label id="lab_oas_InventoryCurrentandNoncurrent_5123547AC94FEFF6DD6E989715C75A7D_documentation_en-US" xlink:label="lab_oas_InventoryCurrentandNoncurrent_5123547AC94FEFF6DD6E989715C75A7D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents the aggregate of current and non-current inventory, including linefill.</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_InventoryCurrentandNoncurrent" xlink:label="loc_oas_InventoryCurrentandNoncurrent_5123547AC94FEFF6DD6E989715C75A7D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_InventoryCurrentandNoncurrent_5123547AC94FEFF6DD6E989715C75A7D" xlink:to="lab_oas_InventoryCurrentandNoncurrent_5123547AC94FEFF6DD6E989715C75A7D" xlink:type="arc" />
    <link:label id="lab_us-gaap_SubsequentEventsAbstract_AFEF8D88D671C241182A602EBD815196_label_en-US" xlink:label="lab_us-gaap_SubsequentEventsAbstract_AFEF8D88D671C241182A602EBD815196" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subsequent Events [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventsAbstract" xlink:label="loc_us-gaap_SubsequentEventsAbstract_AFEF8D88D671C241182A602EBD815196" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubsequentEventsAbstract_AFEF8D88D671C241182A602EBD815196" xlink:to="lab_us-gaap_SubsequentEventsAbstract_AFEF8D88D671C241182A602EBD815196" xlink:type="arc" />
    <link:label id="lab_us-gaap_SubsequentEventsTextBlock_A88107E24D2C5CA25B8B602EBD812A36_terseLabel_en-US" xlink:label="lab_us-gaap_SubsequentEventsTextBlock_A88107E24D2C5CA25B8B602EBD812A36" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Subsequent Events</link:label>
    <link:label id="lab_us-gaap_SubsequentEventsTextBlock_A88107E24D2C5CA25B8B602EBD812A36_label_en-US" xlink:label="lab_us-gaap_SubsequentEventsTextBlock_A88107E24D2C5CA25B8B602EBD812A36" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subsequent Events [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventsTextBlock" xlink:label="loc_us-gaap_SubsequentEventsTextBlock_A88107E24D2C5CA25B8B602EBD812A36" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubsequentEventsTextBlock_A88107E24D2C5CA25B8B602EBD812A36" xlink:to="lab_us-gaap_SubsequentEventsTextBlock_A88107E24D2C5CA25B8B602EBD812A36" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeGainLossOnDerivativeNet_969885F1CF9BF532FB38602EBF49F033_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeGainLossOnDerivativeNet_969885F1CF9BF532FB38602EBF49F033" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net loss on derivative instruments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeGainLossOnDerivativeNet" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_969885F1CF9BF532FB38602EBF49F033" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeGainLossOnDerivativeNet_969885F1CF9BF532FB38602EBF49F033" xlink:to="lab_us-gaap_DerivativeGainLossOnDerivativeNet_969885F1CF9BF532FB38602EBF49F033" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeOperatingLeasesTextBlock_6BB7290205DC97EF18DC78B23B854F02_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeasesTextBlock_6BB7290205DC97EF18DC78B23B854F02" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Leases</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeasesTextBlock_6BB7290205DC97EF18DC78B23B854F02_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeasesTextBlock_6BB7290205DC97EF18DC78B23B854F02" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Leases [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeasesTextBlock" xlink:label="loc_us-gaap_LesseeOperatingLeasesTextBlock_6BB7290205DC97EF18DC78B23B854F02" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeasesTextBlock_6BB7290205DC97EF18DC78B23B854F02" xlink:to="lab_us-gaap_LesseeOperatingLeasesTextBlock_6BB7290205DC97EF18DC78B23B854F02" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeFinanceLeasesTextBlock_63AF3C8E76363F2253C178B2B1D43014_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeFinanceLeasesTextBlock_63AF3C8E76363F2253C178B2B1D43014" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Leases</link:label>
    <link:label id="lab_us-gaap_LesseeFinanceLeasesTextBlock_63AF3C8E76363F2253C178B2B1D43014_label_en-US" xlink:label="lab_us-gaap_LesseeFinanceLeasesTextBlock_63AF3C8E76363F2253C178B2B1D43014" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Finance Leases [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeFinanceLeasesTextBlock" xlink:label="loc_us-gaap_LesseeFinanceLeasesTextBlock_63AF3C8E76363F2253C178B2B1D43014" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeFinanceLeasesTextBlock_63AF3C8E76363F2253C178B2B1D43014" xlink:to="lab_us-gaap_LesseeFinanceLeasesTextBlock_63AF3C8E76363F2253C178B2B1D43014" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetsAbstract_378561BD729FB3F330027A57D69E9589_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsAbstract_378561BD729FB3F330027A57D69E9589" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ASSETS</link:label>
    <link:label id="lab_us-gaap_AssetsAbstract_378561BD729FB3F330027A57D69E9589_label_en-US" xlink:label="lab_us-gaap_AssetsAbstract_378561BD729FB3F330027A57D69E9589" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_378561BD729FB3F330027A57D69E9589" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsAbstract_378561BD729FB3F330027A57D69E9589" xlink:to="lab_us-gaap_AssetsAbstract_378561BD729FB3F330027A57D69E9589" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetsCurrentAbstract_6D6095880FDA068679057A57D69E67AD_verboseLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrentAbstract_6D6095880FDA068679057A57D69E67AD" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Current assets</link:label>
    <link:label id="lab_us-gaap_AssetsCurrentAbstract_6D6095880FDA068679057A57D69E67AD_label_en-US" xlink:label="lab_us-gaap_AssetsCurrentAbstract_6D6095880FDA068679057A57D69E67AD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets, Current [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_us-gaap_AssetsCurrentAbstract_6D6095880FDA068679057A57D69E67AD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsCurrentAbstract_6D6095880FDA068679057A57D69E67AD" xlink:to="lab_us-gaap_AssetsCurrentAbstract_6D6095880FDA068679057A57D69E67AD" xlink:type="arc" />
    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_67D01AC72FC08D1663407A57D69FDEFD_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_67D01AC72FC08D1663407A57D69FDEFD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents</link:label>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_67D01AC72FC08D1663407A57D69FDEFD_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_67D01AC72FC08D1663407A57D69FDEFD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents, at Carrying Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_67D01AC72FC08D1663407A57D69FDEFD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_67D01AC72FC08D1663407A57D69FDEFD" xlink:to="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_67D01AC72FC08D1663407A57D69FDEFD" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccountsReceivableNetCurrent_9A11B22127EC80ADA4EE7A57D69FCDE2_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_9A11B22127EC80ADA4EE7A57D69FCDE2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts receivable, net</link:label>
    <link:label id="lab_us-gaap_AccountsReceivableNetCurrent_9A11B22127EC80ADA4EE7A57D69FCDE2_label_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_9A11B22127EC80ADA4EE7A57D69FCDE2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts Receivable, Net, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_9A11B22127EC80ADA4EE7A57D69FCDE2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountsReceivableNetCurrent_9A11B22127EC80ADA4EE7A57D69FCDE2" xlink:to="lab_us-gaap_AccountsReceivableNetCurrent_9A11B22127EC80ADA4EE7A57D69FCDE2" xlink:type="arc" />
    <link:label id="lab_us-gaap_InventoryNet_5B4E142A89F8FFDC72757A57D69FE656_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryNet_5B4E142A89F8FFDC72757A57D69FE656" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Inventory</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_5B4E142A89F8FFDC72757A57D69FE656" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryNet_5B4E142A89F8FFDC72757A57D69FE656" xlink:to="lab_us-gaap_InventoryNet_5B4E142A89F8FFDC72757A57D69FE656" xlink:type="arc" />
    <link:label id="lab_us-gaap_PrepaidExpenseCurrent_9F6D14F75D84BAEDBCF17A57D6A05752_terseLabel_en-US" xlink:label="lab_us-gaap_PrepaidExpenseCurrent_9F6D14F75D84BAEDBCF17A57D6A05752" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Prepaid expenses</link:label>
    <link:label id="lab_us-gaap_PrepaidExpenseCurrent_9F6D14F75D84BAEDBCF17A57D6A05752_label_en-US" xlink:label="lab_us-gaap_PrepaidExpenseCurrent_9F6D14F75D84BAEDBCF17A57D6A05752" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Prepaid Expense, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PrepaidExpenseCurrent" xlink:label="loc_us-gaap_PrepaidExpenseCurrent_9F6D14F75D84BAEDBCF17A57D6A05752" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PrepaidExpenseCurrent_9F6D14F75D84BAEDBCF17A57D6A05752" xlink:to="lab_us-gaap_PrepaidExpenseCurrent_9F6D14F75D84BAEDBCF17A57D6A05752" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeAssetsCurrent_39BBE712ADA77D395A5F7A57D6A0EC7C_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetsCurrent_39BBE712ADA77D395A5F7A57D6A0EC7C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative instruments</link:label>
    <link:label id="lab_us-gaap_DerivativeAssetsCurrent_39BBE712ADA77D395A5F7A57D6A0EC7C_label_en-US" xlink:label="lab_us-gaap_DerivativeAssetsCurrent_39BBE712ADA77D395A5F7A57D6A0EC7C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeAssetsCurrent" xlink:label="loc_us-gaap_DerivativeAssetsCurrent_39BBE712ADA77D395A5F7A57D6A0EC7C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeAssetsCurrent_39BBE712ADA77D395A5F7A57D6A0EC7C" xlink:to="lab_us-gaap_DerivativeAssetsCurrent_39BBE712ADA77D395A5F7A57D6A0EC7C" xlink:type="arc" />
    <link:label id="lab_us-gaap_IntangibleAssetsCurrent_D435C1E9400321033D9A7A57D6A03E21_terseLabel_en-US" xlink:label="lab_us-gaap_IntangibleAssetsCurrent_D435C1E9400321033D9A7A57D6A03E21" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Intangible assets, net</link:label>
    <link:label id="lab_us-gaap_IntangibleAssetsCurrent_D435C1E9400321033D9A7A57D6A03E21_label_en-US" xlink:label="lab_us-gaap_IntangibleAssetsCurrent_D435C1E9400321033D9A7A57D6A03E21" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Intangible Assets, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IntangibleAssetsCurrent" xlink:label="loc_us-gaap_IntangibleAssetsCurrent_D435C1E9400321033D9A7A57D6A03E21" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IntangibleAssetsCurrent_D435C1E9400321033D9A7A57D6A03E21" xlink:to="lab_us-gaap_IntangibleAssetsCurrent_D435C1E9400321033D9A7A57D6A03E21" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherAssetsCurrent_4C02C01697C92E8A41797A57D6A10648_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsCurrent_4C02C01697C92E8A41797A57D6A10648" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other current assets</link:label>
    <link:label id="lab_us-gaap_OtherAssetsCurrent_4C02C01697C92E8A41797A57D6A10648_label_en-US" xlink:label="lab_us-gaap_OtherAssetsCurrent_4C02C01697C92E8A41797A57D6A10648" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="loc_us-gaap_OtherAssetsCurrent_4C02C01697C92E8A41797A57D6A10648" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherAssetsCurrent_4C02C01697C92E8A41797A57D6A10648" xlink:to="lab_us-gaap_OtherAssetsCurrent_4C02C01697C92E8A41797A57D6A10648" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetsCurrent_C8F28C63D2C3B69FDD737A57D6A18A2E_totalLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrent_C8F28C63D2C3B69FDD737A57D6A18A2E" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total current assets</link:label>
    <link:label id="lab_us-gaap_AssetsCurrent_C8F28C63D2C3B69FDD737A57D6A18A2E_label_en-US" xlink:label="lab_us-gaap_AssetsCurrent_C8F28C63D2C3B69FDD737A57D6A18A2E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_C8F28C63D2C3B69FDD737A57D6A18A2E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsCurrent_C8F28C63D2C3B69FDD737A57D6A18A2E" xlink:to="lab_us-gaap_AssetsCurrent_C8F28C63D2C3B69FDD737A57D6A18A2E" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNetAbstract_B98EE9E2A78D0DD531767A57D6A12745_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNetAbstract_B98EE9E2A78D0DD531767A57D6A12745" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, plant and equipment</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNetAbstract_B98EE9E2A78D0DD531767A57D6A12745_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNetAbstract_B98EE9E2A78D0DD531767A57D6A12745" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Net [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNetAbstract" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_B98EE9E2A78D0DD531767A57D6A12745" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_B98EE9E2A78D0DD531767A57D6A12745" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentNetAbstract_B98EE9E2A78D0DD531767A57D6A12745" xlink:type="arc" />
    <link:label id="lab_us-gaap_OilAndGasPropertySuccessfulEffortMethodGross_512684668C146ACE92CF7A57D6A10DDE_terseLabel_en-US" xlink:label="lab_us-gaap_OilAndGasPropertySuccessfulEffortMethodGross_512684668C146ACE92CF7A57D6A10DDE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Oil and gas properties (successful efforts method)</link:label>
    <link:label id="lab_us-gaap_OilAndGasPropertySuccessfulEffortMethodGross_512684668C146ACE92CF7A57D6A10DDE_label_en-US" xlink:label="lab_us-gaap_OilAndGasPropertySuccessfulEffortMethodGross_512684668C146ACE92CF7A57D6A10DDE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Oil and Gas Property, Successful Effort Method, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OilAndGasPropertySuccessfulEffortMethodGross" xlink:label="loc_us-gaap_OilAndGasPropertySuccessfulEffortMethodGross_512684668C146ACE92CF7A57D6A10DDE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OilAndGasPropertySuccessfulEffortMethodGross_512684668C146ACE92CF7A57D6A10DDE" xlink:to="lab_us-gaap_OilAndGasPropertySuccessfulEffortMethodGross_512684668C146ACE92CF7A57D6A10DDE" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentOther_BEBE297C8891853C82497A57D6A2A29E_verboseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentOther_BEBE297C8891853C82497A57D6A2A29E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Other property and equipment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentOther" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentOther_BEBE297C8891853C82497A57D6A2A29E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentOther_BEBE297C8891853C82497A57D6A2A29E" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentOther_BEBE297C8891853C82497A57D6A2A29E" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_5433B8F02E9EB79D14127A57D6A202D0_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_5433B8F02E9EB79D14127A57D6A202D0" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Less: accumulated depreciation, depletion, amortization and impairment</link:label>
    <link:label id="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_5433B8F02E9EB79D14127A57D6A202D0_label_en-US" xlink:label="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_5433B8F02E9EB79D14127A57D6A202D0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_5433B8F02E9EB79D14127A57D6A202D0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_5433B8F02E9EB79D14127A57D6A202D0" xlink:to="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_5433B8F02E9EB79D14127A57D6A202D0" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeAssetsNoncurrent_F1032669D200FA807FC57A57D6A32D13_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetsNoncurrent_F1032669D200FA807FC57A57D6A32D13" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative instruments</link:label>
    <link:label id="lab_us-gaap_DerivativeAssetsNoncurrent_F1032669D200FA807FC57A57D6A32D13_label_en-US" xlink:label="lab_us-gaap_DerivativeAssetsNoncurrent_F1032669D200FA807FC57A57D6A32D13" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeAssetsNoncurrent" xlink:label="loc_us-gaap_DerivativeAssetsNoncurrent_F1032669D200FA807FC57A57D6A32D13" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeAssetsNoncurrent_F1032669D200FA807FC57A57D6A32D13" xlink:to="lab_us-gaap_DerivativeAssetsNoncurrent_F1032669D200FA807FC57A57D6A32D13" xlink:type="arc" />
    <link:label id="lab_us-gaap_InventoryNoncurrent_39C78BBD4788252504457A57D6A3804B_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryNoncurrent_39C78BBD4788252504457A57D6A3804B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term inventory</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryNoncurrent" xlink:label="loc_us-gaap_InventoryNoncurrent_39C78BBD4788252504457A57D6A3804B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryNoncurrent_39C78BBD4788252504457A57D6A3804B" xlink:to="lab_us-gaap_InventoryNoncurrent_39C78BBD4788252504457A57D6A3804B" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseRightOfUseAsset_49C37E592E88875F42C07A57D6A3A0B4_verboseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseRightOfUseAsset_49C37E592E88875F42C07A57D6A3A0B4" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Operating right-of-use assets</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseRightOfUseAsset_49C37E592E88875F42C07A57D6A3A0B4_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseRightOfUseAsset_49C37E592E88875F42C07A57D6A3A0B4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Right-of-Use Asset</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_49C37E592E88875F42C07A57D6A3A0B4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseRightOfUseAsset_49C37E592E88875F42C07A57D6A3A0B4" xlink:to="lab_us-gaap_OperatingLeaseRightOfUseAsset_49C37E592E88875F42C07A57D6A3A0B4" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherAssetsNoncurrent_03A3486A640FC743ABD17A57D6A3FFD9_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_03A3486A640FC743ABD17A57D6A3FFD9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other assets</link:label>
    <link:label id="lab_us-gaap_OtherAssetsNoncurrent_03A3486A640FC743ABD17A57D6A3FFD9_label_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_03A3486A640FC743ABD17A57D6A3FFD9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_03A3486A640FC743ABD17A57D6A3FFD9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_03A3486A640FC743ABD17A57D6A3FFD9" xlink:to="lab_us-gaap_OtherAssetsNoncurrent_03A3486A640FC743ABD17A57D6A3FFD9" xlink:type="arc" />
    <link:label id="lab_us-gaap_Assets_BE41D5665809A6430D847A57D6A31CEB_totalLabel_en-US" xlink:label="lab_us-gaap_Assets_BE41D5665809A6430D847A57D6A31CEB" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total assets</link:label>
    <link:label id="lab_us-gaap_Assets_BE41D5665809A6430D847A57D6A31CEB_label_en-US" xlink:label="lab_us-gaap_Assets_BE41D5665809A6430D847A57D6A31CEB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_BE41D5665809A6430D847A57D6A31CEB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Assets_BE41D5665809A6430D847A57D6A31CEB" xlink:to="lab_us-gaap_Assets_BE41D5665809A6430D847A57D6A31CEB" xlink:type="arc" />
    <link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_10C70D2C47E1D15307657A57D6A43F7A_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_10C70D2C47E1D15307657A57D6A43F7A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">LIABILITIES AND STOCKHOLDERS&#8217; EQUITY</link:label>
    <link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_10C70D2C47E1D15307657A57D6A43F7A_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_10C70D2C47E1D15307657A57D6A43F7A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities and Equity [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_10C70D2C47E1D15307657A57D6A43F7A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_10C70D2C47E1D15307657A57D6A43F7A" xlink:to="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_10C70D2C47E1D15307657A57D6A43F7A" xlink:type="arc" />
    <link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_C6A898575DE65E6501DD7A57D6A46E00_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_C6A898575DE65E6501DD7A57D6A46E00" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current liabilities</link:label>
    <link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_C6A898575DE65E6501DD7A57D6A46E00_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_C6A898575DE65E6501DD7A57D6A46E00" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities, Current [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_C6A898575DE65E6501DD7A57D6A46E00" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_C6A898575DE65E6501DD7A57D6A46E00" xlink:to="lab_us-gaap_LiabilitiesCurrentAbstract_C6A898575DE65E6501DD7A57D6A46E00" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccountsPayableCurrent_0EA855942B75186697FD7A57D6A48EBF_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrent_0EA855942B75186697FD7A57D6A48EBF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts payable</link:label>
    <link:label id="lab_us-gaap_AccountsPayableCurrent_0EA855942B75186697FD7A57D6A48EBF_label_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrent_0EA855942B75186697FD7A57D6A48EBF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts Payable, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaap_AccountsPayableCurrent_0EA855942B75186697FD7A57D6A48EBF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountsPayableCurrent_0EA855942B75186697FD7A57D6A48EBF" xlink:to="lab_us-gaap_AccountsPayableCurrent_0EA855942B75186697FD7A57D6A48EBF" xlink:type="arc" />
    <link:label id="lab_oas_RevenuesPayableAndProductionTaxesCurrent_915E52254E9005413F097A57D6A4573F_terseLabel_en-US" xlink:label="lab_oas_RevenuesPayableAndProductionTaxesCurrent_915E52254E9005413F097A57D6A4573F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenues and production taxes payable</link:label>
    <link:label id="lab_oas_RevenuesPayableAndProductionTaxesCurrent_915E52254E9005413F097A57D6A4573F_label_en-US" xlink:label="lab_oas_RevenuesPayableAndProductionTaxesCurrent_915E52254E9005413F097A57D6A4573F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenues Payable And Production Taxes Current</link:label>
    <link:label id="lab_oas_RevenuesPayableAndProductionTaxesCurrent_915E52254E9005413F097A57D6A4573F_documentation_en-US" xlink:label="lab_oas_RevenuesPayableAndProductionTaxesCurrent_915E52254E9005413F097A57D6A4573F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The total carrying value as of the balance sheet date of obligations incurred through that date for revenue payable for the working and royalty interests not yet distributed and production, severance and other taxes payable (due within one year or within the normal operating cycle if longer).</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_RevenuesPayableAndProductionTaxesCurrent" xlink:label="loc_oas_RevenuesPayableAndProductionTaxesCurrent_915E52254E9005413F097A57D6A4573F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_RevenuesPayableAndProductionTaxesCurrent_915E52254E9005413F097A57D6A4573F" xlink:to="lab_oas_RevenuesPayableAndProductionTaxesCurrent_915E52254E9005413F097A57D6A4573F" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccruedLiabilitiesCurrent_7649573146A2D0CD07DA7A57D6A5B580_terseLabel_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrent_7649573146A2D0CD07DA7A57D6A5B580" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrued liabilities</link:label>
    <link:label id="lab_us-gaap_AccruedLiabilitiesCurrent_7649573146A2D0CD07DA7A57D6A5B580_label_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrent_7649573146A2D0CD07DA7A57D6A5B580" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accrued Liabilities, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_7649573146A2D0CD07DA7A57D6A5B580" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_7649573146A2D0CD07DA7A57D6A5B580" xlink:to="lab_us-gaap_AccruedLiabilitiesCurrent_7649573146A2D0CD07DA7A57D6A5B580" xlink:type="arc" />
    <link:label id="lab_us-gaap_InterestPayableCurrent_58FEBB691190D6A0AE137A57D6A53FE2_terseLabel_en-US" xlink:label="lab_us-gaap_InterestPayableCurrent_58FEBB691190D6A0AE137A57D6A53FE2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrued interest payable</link:label>
    <link:label id="lab_us-gaap_InterestPayableCurrent_58FEBB691190D6A0AE137A57D6A53FE2_label_en-US" xlink:label="lab_us-gaap_InterestPayableCurrent_58FEBB691190D6A0AE137A57D6A53FE2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Payable, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestPayableCurrent" xlink:label="loc_us-gaap_InterestPayableCurrent_58FEBB691190D6A0AE137A57D6A53FE2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestPayableCurrent_58FEBB691190D6A0AE137A57D6A53FE2" xlink:to="lab_us-gaap_InterestPayableCurrent_58FEBB691190D6A0AE137A57D6A53FE2" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeLiabilitiesCurrent_018D84AB6237CB30E7C27A57D6A5286B_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilitiesCurrent_018D84AB6237CB30E7C27A57D6A5286B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative instruments</link:label>
    <link:label id="lab_us-gaap_DerivativeLiabilitiesCurrent_018D84AB6237CB30E7C27A57D6A5286B_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilitiesCurrent_018D84AB6237CB30E7C27A57D6A5286B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeLiabilitiesCurrent" xlink:label="loc_us-gaap_DerivativeLiabilitiesCurrent_018D84AB6237CB30E7C27A57D6A5286B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLiabilitiesCurrent_018D84AB6237CB30E7C27A57D6A5286B" xlink:to="lab_us-gaap_DerivativeLiabilitiesCurrent_018D84AB6237CB30E7C27A57D6A5286B" xlink:type="arc" />
    <link:label id="lab_oas_AdvancesFromJointInterestPartnersCurrent_65178773AEB9FA5C04887A57D6A590F4_terseLabel_en-US" xlink:label="lab_oas_AdvancesFromJointInterestPartnersCurrent_65178773AEB9FA5C04887A57D6A590F4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Advances from joint interest partners</link:label>
    <link:label id="lab_oas_AdvancesFromJointInterestPartnersCurrent_65178773AEB9FA5C04887A57D6A590F4_label_en-US" xlink:label="lab_oas_AdvancesFromJointInterestPartnersCurrent_65178773AEB9FA5C04887A57D6A590F4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Advances From Joint Interest Partners Current</link:label>
    <link:label id="lab_oas_AdvancesFromJointInterestPartnersCurrent_65178773AEB9FA5C04887A57D6A590F4_documentation_en-US" xlink:label="lab_oas_AdvancesFromJointInterestPartnersCurrent_65178773AEB9FA5C04887A57D6A590F4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The total of the amounts received in advance for capital projects from our joint interest partners.</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_AdvancesFromJointInterestPartnersCurrent" xlink:label="loc_oas_AdvancesFromJointInterestPartnersCurrent_65178773AEB9FA5C04887A57D6A590F4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_AdvancesFromJointInterestPartnersCurrent_65178773AEB9FA5C04887A57D6A590F4" xlink:to="lab_oas_AdvancesFromJointInterestPartnersCurrent_65178773AEB9FA5C04887A57D6A590F4" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseLiabilityCurrent_4779F3B21B75D51209E37A57D6A5CE23_verboseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityCurrent_4779F3B21B75D51209E37A57D6A5CE23" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Current operating lease liabilities</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseLiabilityCurrent_4779F3B21B75D51209E37A57D6A5CE23_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityCurrent_4779F3B21B75D51209E37A57D6A5CE23" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Liability, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_4779F3B21B75D51209E37A57D6A5CE23" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLiabilityCurrent_4779F3B21B75D51209E37A57D6A5CE23" xlink:to="lab_us-gaap_OperatingLeaseLiabilityCurrent_4779F3B21B75D51209E37A57D6A5CE23" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherLiabilitiesCurrent_ECEDC0FCAA927FC7B2747A57D6A6C5C2_terseLabel_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesCurrent_ECEDC0FCAA927FC7B2747A57D6A6C5C2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other current liabilities</link:label>
    <link:label id="lab_us-gaap_OtherLiabilitiesCurrent_ECEDC0FCAA927FC7B2747A57D6A6C5C2_label_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesCurrent_ECEDC0FCAA927FC7B2747A57D6A6C5C2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Liabilities, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_ECEDC0FCAA927FC7B2747A57D6A6C5C2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherLiabilitiesCurrent_ECEDC0FCAA927FC7B2747A57D6A6C5C2" xlink:to="lab_us-gaap_OtherLiabilitiesCurrent_ECEDC0FCAA927FC7B2747A57D6A6C5C2" xlink:type="arc" />
    <link:label id="lab_us-gaap_LiabilitiesCurrent_0B38E9CDF75E78DC5D1E7A57D6A67F95_totalLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrent_0B38E9CDF75E78DC5D1E7A57D6A67F95" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total current liabilities</link:label>
    <link:label id="lab_us-gaap_LiabilitiesCurrent_0B38E9CDF75E78DC5D1E7A57D6A67F95_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrent_0B38E9CDF75E78DC5D1E7A57D6A67F95" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_0B38E9CDF75E78DC5D1E7A57D6A67F95" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesCurrent_0B38E9CDF75E78DC5D1E7A57D6A67F95" xlink:to="lab_us-gaap_LiabilitiesCurrent_0B38E9CDF75E78DC5D1E7A57D6A67F95" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongTermDebtNoncurrent_AC0EF22672A5D0A681117A57D6A6F2A3_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtNoncurrent_AC0EF22672A5D0A681117A57D6A6F2A3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term debt</link:label>
    <link:label id="lab_us-gaap_LongTermDebtNoncurrent_AC0EF22672A5D0A681117A57D6A6F2A3_label_en-US" xlink:label="lab_us-gaap_LongTermDebtNoncurrent_AC0EF22672A5D0A681117A57D6A6F2A3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Excluding Current Maturities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_AC0EF22672A5D0A681117A57D6A6F2A3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtNoncurrent_AC0EF22672A5D0A681117A57D6A6F2A3" xlink:to="lab_us-gaap_LongTermDebtNoncurrent_AC0EF22672A5D0A681117A57D6A6F2A3" xlink:type="arc" />
    <link:label id="lab_us-gaap_DeferredIncomeTaxLiabilitiesNet_74F2D9E2DF7461AEC1A67A57D6A6EF29_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxLiabilitiesNet_74F2D9E2DF7461AEC1A67A57D6A6EF29" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred income taxes</link:label>
    <link:label id="lab_us-gaap_DeferredIncomeTaxLiabilitiesNet_74F2D9E2DF7461AEC1A67A57D6A6EF29_label_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxLiabilitiesNet_74F2D9E2DF7461AEC1A67A57D6A6EF29" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Income Tax Liabilities, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_74F2D9E2DF7461AEC1A67A57D6A6EF29" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_74F2D9E2DF7461AEC1A67A57D6A6EF29" xlink:to="lab_us-gaap_DeferredIncomeTaxLiabilitiesNet_74F2D9E2DF7461AEC1A67A57D6A6EF29" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetRetirementObligationsNoncurrent_172717C489530231196D7A57D6A6E7B2_terseLabel_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationsNoncurrent_172717C489530231196D7A57D6A6E7B2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Asset retirement obligations</link:label>
    <link:label id="lab_us-gaap_AssetRetirementObligationsNoncurrent_172717C489530231196D7A57D6A6E7B2_label_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationsNoncurrent_172717C489530231196D7A57D6A6E7B2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Retirement Obligations, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetRetirementObligationsNoncurrent" xlink:label="loc_us-gaap_AssetRetirementObligationsNoncurrent_172717C489530231196D7A57D6A6E7B2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetRetirementObligationsNoncurrent_172717C489530231196D7A57D6A6E7B2" xlink:to="lab_us-gaap_AssetRetirementObligationsNoncurrent_172717C489530231196D7A57D6A6E7B2" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeLiabilitiesNoncurrent_5044AB398789091C036D7A57D6A786CE_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilitiesNoncurrent_5044AB398789091C036D7A57D6A786CE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative instruments</link:label>
    <link:label id="lab_us-gaap_DerivativeLiabilitiesNoncurrent_5044AB398789091C036D7A57D6A786CE_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilitiesNoncurrent_5044AB398789091C036D7A57D6A786CE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeLiabilitiesNoncurrent" xlink:label="loc_us-gaap_DerivativeLiabilitiesNoncurrent_5044AB398789091C036D7A57D6A786CE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLiabilitiesNoncurrent_5044AB398789091C036D7A57D6A786CE" xlink:to="lab_us-gaap_DerivativeLiabilitiesNoncurrent_5044AB398789091C036D7A57D6A786CE" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_DBFB737DD1B6414899677A57D6A7342D_verboseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_DBFB737DD1B6414899677A57D6A7342D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Operating lease liabilities</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_DBFB737DD1B6414899677A57D6A7342D_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_DBFB737DD1B6414899677A57D6A7342D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Liability, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_DBFB737DD1B6414899677A57D6A7342D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_DBFB737DD1B6414899677A57D6A7342D" xlink:to="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_DBFB737DD1B6414899677A57D6A7342D" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherLiabilitiesNoncurrent_07EE47A59C29405B58E67A57D6A748FF_terseLabel_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrent_07EE47A59C29405B58E67A57D6A748FF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other liabilities</link:label>
    <link:label id="lab_us-gaap_OtherLiabilitiesNoncurrent_07EE47A59C29405B58E67A57D6A748FF_label_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrent_07EE47A59C29405B58E67A57D6A748FF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Liabilities, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_07EE47A59C29405B58E67A57D6A748FF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_07EE47A59C29405B58E67A57D6A748FF" xlink:to="lab_us-gaap_OtherLiabilitiesNoncurrent_07EE47A59C29405B58E67A57D6A748FF" xlink:type="arc" />
    <link:label id="lab_us-gaap_Liabilities_3EA1A62468847F928DFE7A57D6A71F8C_totalLabel_en-US" xlink:label="lab_us-gaap_Liabilities_3EA1A62468847F928DFE7A57D6A71F8C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total liabilities</link:label>
    <link:label id="lab_us-gaap_Liabilities_3EA1A62468847F928DFE7A57D6A71F8C_label_en-US" xlink:label="lab_us-gaap_Liabilities_3EA1A62468847F928DFE7A57D6A71F8C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_3EA1A62468847F928DFE7A57D6A71F8C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Liabilities_3EA1A62468847F928DFE7A57D6A71F8C" xlink:to="lab_us-gaap_Liabilities_3EA1A62468847F928DFE7A57D6A71F8C" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommitmentsAndContingencies_36F5BCEDBB32D47FD22D7A57D6A8659B_terseLabel_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingencies_36F5BCEDBB32D47FD22D7A57D6A8659B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commitments and contingencies</link:label>
    <link:label id="lab_us-gaap_CommitmentsAndContingencies_36F5BCEDBB32D47FD22D7A57D6A8659B_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingencies_36F5BCEDBB32D47FD22D7A57D6A8659B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commitments and Contingencies</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_us-gaap_CommitmentsAndContingencies_36F5BCEDBB32D47FD22D7A57D6A8659B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommitmentsAndContingencies_36F5BCEDBB32D47FD22D7A57D6A8659B" xlink:to="lab_us-gaap_CommitmentsAndContingencies_36F5BCEDBB32D47FD22D7A57D6A8659B" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockholdersEquityAbstract_17590C5570DCEC9091F87A57D6A81800_terseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityAbstract_17590C5570DCEC9091F87A57D6A81800" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stockholders&#8217; equity</link:label>
    <link:label id="lab_us-gaap_StockholdersEquityAbstract_17590C5570DCEC9091F87A57D6A81800_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityAbstract_17590C5570DCEC9091F87A57D6A81800" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stockholders' Equity Attributable to Parent [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="loc_us-gaap_StockholdersEquityAbstract_17590C5570DCEC9091F87A57D6A81800" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockholdersEquityAbstract_17590C5570DCEC9091F87A57D6A81800" xlink:to="lab_us-gaap_StockholdersEquityAbstract_17590C5570DCEC9091F87A57D6A81800" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommonStockValue_015F2798A3288A5CDC1D7A57D6A835E5_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockValue_015F2798A3288A5CDC1D7A57D6A835E5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common stock, $0.01 par value: 900,000,000 shares authorized; 324,829,258 shares issued and 322,051,268 shares outstanding at March 31, 2019 and 320,469,049 shares issued and 318,377,161 shares outstanding at December 31, 2018</link:label>
    <link:label id="lab_us-gaap_CommonStockValue_015F2798A3288A5CDC1D7A57D6A835E5_label_en-US" xlink:label="lab_us-gaap_CommonStockValue_015F2798A3288A5CDC1D7A57D6A835E5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock, Value, Issued</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaap_CommonStockValue_015F2798A3288A5CDC1D7A57D6A835E5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockValue_015F2798A3288A5CDC1D7A57D6A835E5" xlink:to="lab_us-gaap_CommonStockValue_015F2798A3288A5CDC1D7A57D6A835E5" xlink:type="arc" />
    <link:label id="lab_us-gaap_TreasuryStockValue_EB7C5D702A9F65EEFF307A57D6A9E3A2_negatedLabel_en-US" xlink:label="lab_us-gaap_TreasuryStockValue_EB7C5D702A9F65EEFF307A57D6A9E3A2" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Treasury stock, at cost: 2,777,990 and 2,091,888 shares at March 31, 2019 and December 31, 2018, respectively</link:label>
    <link:label id="lab_us-gaap_TreasuryStockValue_EB7C5D702A9F65EEFF307A57D6A9E3A2_label_en-US" xlink:label="lab_us-gaap_TreasuryStockValue_EB7C5D702A9F65EEFF307A57D6A9E3A2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Treasury Stock, Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TreasuryStockValue" xlink:label="loc_us-gaap_TreasuryStockValue_EB7C5D702A9F65EEFF307A57D6A9E3A2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TreasuryStockValue_EB7C5D702A9F65EEFF307A57D6A9E3A2" xlink:to="lab_us-gaap_TreasuryStockValue_EB7C5D702A9F65EEFF307A57D6A9E3A2" xlink:type="arc" />
    <link:label id="lab_us-gaap_AdditionalPaidInCapitalCommonStock_ABCFA84612557E46F3977A57D6A90514_terseLabel_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalCommonStock_ABCFA84612557E46F3977A57D6A90514" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Additional paid-in capital</link:label>
    <link:label id="lab_us-gaap_AdditionalPaidInCapitalCommonStock_ABCFA84612557E46F3977A57D6A90514_label_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalCommonStock_ABCFA84612557E46F3977A57D6A90514" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Additional Paid in Capital, Common Stock</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_ABCFA84612557E46F3977A57D6A90514" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdditionalPaidInCapitalCommonStock_ABCFA84612557E46F3977A57D6A90514" xlink:to="lab_us-gaap_AdditionalPaidInCapitalCommonStock_ABCFA84612557E46F3977A57D6A90514" xlink:type="arc" />
    <link:label id="lab_us-gaap_RetainedEarningsAccumulatedDeficit_B5F30F6C62A3835012477A57D6AA34B5_terseLabel_en-US" xlink:label="lab_us-gaap_RetainedEarningsAccumulatedDeficit_B5F30F6C62A3835012477A57D6AA34B5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Retained earnings</link:label>
    <link:label id="lab_us-gaap_RetainedEarningsAccumulatedDeficit_B5F30F6C62A3835012477A57D6AA34B5_label_en-US" xlink:label="lab_us-gaap_RetainedEarningsAccumulatedDeficit_B5F30F6C62A3835012477A57D6AA34B5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Retained Earnings (Accumulated Deficit)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_B5F30F6C62A3835012477A57D6AA34B5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RetainedEarningsAccumulatedDeficit_B5F30F6C62A3835012477A57D6AA34B5" xlink:to="lab_us-gaap_RetainedEarningsAccumulatedDeficit_B5F30F6C62A3835012477A57D6AA34B5" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockholdersEquity_1FD136A036413A796A277A57D6AA124B_totalLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquity_1FD136A036413A796A277A57D6AA124B" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Oasis share of stockholders&#8217; equity</link:label>
    <link:label id="lab_us-gaap_StockholdersEquity_1FD136A036413A796A277A57D6AA124B_label_en-US" xlink:label="lab_us-gaap_StockholdersEquity_1FD136A036413A796A277A57D6AA124B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stockholders' Equity Attributable to Parent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_1FD136A036413A796A277A57D6AA124B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockholdersEquity_1FD136A036413A796A277A57D6AA124B" xlink:to="lab_us-gaap_StockholdersEquity_1FD136A036413A796A277A57D6AA124B" xlink:type="arc" />
    <link:label id="lab_us-gaap_MinorityInterest_16EEB7414C507DDA31C27A57D6AA9803_terseLabel_en-US" xlink:label="lab_us-gaap_MinorityInterest_16EEB7414C507DDA31C27A57D6AA9803" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-controlling interests</link:label>
    <link:label id="lab_us-gaap_MinorityInterest_16EEB7414C507DDA31C27A57D6AA9803_label_en-US" xlink:label="lab_us-gaap_MinorityInterest_16EEB7414C507DDA31C27A57D6AA9803" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stockholders' Equity Attributable to Noncontrolling Interest</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MinorityInterest" xlink:label="loc_us-gaap_MinorityInterest_16EEB7414C507DDA31C27A57D6AA9803" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MinorityInterest_16EEB7414C507DDA31C27A57D6AA9803" xlink:to="lab_us-gaap_MinorityInterest_16EEB7414C507DDA31C27A57D6AA9803" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_FB06197C284B705556E57A57D6AA1CDC_totalLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_FB06197C284B705556E57A57D6AA1CDC" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total stockholders&#8217; equity</link:label>
    <link:label id="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_FB06197C284B705556E57A57D6AA1CDC_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_FB06197C284B705556E57A57D6AA1CDC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_FB06197C284B705556E57A57D6AA1CDC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_FB06197C284B705556E57A57D6AA1CDC" xlink:to="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_FB06197C284B705556E57A57D6AA1CDC" xlink:type="arc" />
    <link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquity_1D4D50EEFF831461BC1D7A57D6AA885A_totalLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquity_1D4D50EEFF831461BC1D7A57D6AA885A" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total liabilities and stockholders&#8217; equity</link:label>
    <link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquity_1D4D50EEFF831461BC1D7A57D6AA885A_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquity_1D4D50EEFF831461BC1D7A57D6AA885A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities and Equity</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_1D4D50EEFF831461BC1D7A57D6AA885A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_1D4D50EEFF831461BC1D7A57D6AA885A" xlink:to="lab_us-gaap_LiabilitiesAndStockholdersEquity_1D4D50EEFF831461BC1D7A57D6AA885A" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_FE90602C7EEC4C5BA1AF8E86D4B04069_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_FE90602C7EEC4C5BA1AF8E86D4B04069" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Segment Reporting Information, by Segment [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_FE90602C7EEC4C5BA1AF8E86D4B04069_label_en-US" xlink:label="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_FE90602C7EEC4C5BA1AF8E86D4B04069" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Segment Reporting Information, by Segment [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_FE90602C7EEC4C5BA1AF8E86D4B04069" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_FE90602C7EEC4C5BA1AF8E86D4B04069" xlink:to="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_FE90602C7EEC4C5BA1AF8E86D4B04069" xlink:type="arc" />
    <link:label id="lab_us-gaap_MaterialReconcilingItemsMember_08D5031931FC3DE3F5908E86D4B1C263_terseLabel_en-US" xlink:label="lab_us-gaap_MaterialReconcilingItemsMember_08D5031931FC3DE3F5908E86D4B1C263" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Inter-segment</link:label>
    <link:label id="lab_us-gaap_MaterialReconcilingItemsMember_08D5031931FC3DE3F5908E86D4B1C263_label_en-US" xlink:label="lab_us-gaap_MaterialReconcilingItemsMember_08D5031931FC3DE3F5908E86D4B1C263" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segment Reconciling Items [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MaterialReconcilingItemsMember" xlink:label="loc_us-gaap_MaterialReconcilingItemsMember_08D5031931FC3DE3F5908E86D4B1C263" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MaterialReconcilingItemsMember_08D5031931FC3DE3F5908E86D4B1C263" xlink:to="lab_us-gaap_MaterialReconcilingItemsMember_08D5031931FC3DE3F5908E86D4B1C263" xlink:type="arc" />
    <link:label id="lab_us-gaap_IntersegmentEliminationMember_E1BC96B321CC718DBEBB8E86D4B13CFC_terseLabel_en-US" xlink:label="lab_us-gaap_IntersegmentEliminationMember_E1BC96B321CC718DBEBB8E86D4B13CFC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Eliminations</link:label>
    <link:label id="lab_us-gaap_IntersegmentEliminationMember_E1BC96B321CC718DBEBB8E86D4B13CFC_label_en-US" xlink:label="lab_us-gaap_IntersegmentEliminationMember_E1BC96B321CC718DBEBB8E86D4B13CFC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Intersegment Eliminations [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IntersegmentEliminationMember" xlink:label="loc_us-gaap_IntersegmentEliminationMember_E1BC96B321CC718DBEBB8E86D4B13CFC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IntersegmentEliminationMember_E1BC96B321CC718DBEBB8E86D4B13CFC" xlink:to="lab_us-gaap_IntersegmentEliminationMember_E1BC96B321CC718DBEBB8E86D4B13CFC" xlink:type="arc" />
    <link:label id="lab_us-gaap_SegmentReportingInformationLineItems_C52776CE69F2D7F97B468E86D4B34D9A_terseLabel_en-US" xlink:label="lab_us-gaap_SegmentReportingInformationLineItems_C52776CE69F2D7F97B468E86D4B34D9A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Segment Reporting Information [Line Items]</link:label>
    <link:label id="lab_us-gaap_SegmentReportingInformationLineItems_C52776CE69F2D7F97B468E86D4B34D9A_label_en-US" xlink:label="lab_us-gaap_SegmentReportingInformationLineItems_C52776CE69F2D7F97B468E86D4B34D9A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segment Reporting Information [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_C52776CE69F2D7F97B468E86D4B34D9A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_C52776CE69F2D7F97B468E86D4B34D9A" xlink:to="lab_us-gaap_SegmentReportingInformationLineItems_C52776CE69F2D7F97B468E86D4B34D9A" xlink:type="arc" />
    <link:label id="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_DE07A42F2DA5A3081B258E86D4B3547B_verboseLabel_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_DE07A42F2DA5A3081B258E86D4B3547B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Total revenues</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_DE07A42F2DA5A3081B258E86D4B3547B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_DE07A42F2DA5A3081B258E86D4B3547B" xlink:to="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_DE07A42F2DA5A3081B258E86D4B3547B" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingIncomeLoss_586EDCEBE8B7D0475EA38E86D4B917EB_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_586EDCEBE8B7D0475EA38E86D4B917EB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating income</link:label>
    <link:label id="lab_us-gaap_OperatingIncomeLoss_586EDCEBE8B7D0475EA38E86D4B917EB_label_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_586EDCEBE8B7D0475EA38E86D4B917EB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Income (Loss)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_586EDCEBE8B7D0475EA38E86D4B917EB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingIncomeLoss_586EDCEBE8B7D0475EA38E86D4B917EB" xlink:to="lab_us-gaap_OperatingIncomeLoss_586EDCEBE8B7D0475EA38E86D4B917EB" xlink:type="arc" />
    <link:label id="lab_us-gaap_NonoperatingIncomeExpense_60C9C645A6E7B5D239088E86D4B90C29_terseLabel_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpense_60C9C645A6E7B5D239088E86D4B90C29" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other income (expense)</link:label>
    <link:label id="lab_us-gaap_NonoperatingIncomeExpense_60C9C645A6E7B5D239088E86D4B90C29_label_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpense_60C9C645A6E7B5D239088E86D4B90C29" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nonoperating Income (Expense)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_60C9C645A6E7B5D239088E86D4B90C29" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_60C9C645A6E7B5D239088E86D4B90C29" xlink:to="lab_us-gaap_NonoperatingIncomeExpense_60C9C645A6E7B5D239088E86D4B90C29" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_D6BACA61E092A1FEA3068E86D4B9780A_totalLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_D6BACA61E092A1FEA3068E86D4B9780A" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Income (loss) before income taxes</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_D6BACA61E092A1FEA3068E86D4B9780A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_D6BACA61E092A1FEA3068E86D4B9780A" xlink:to="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_D6BACA61E092A1FEA3068E86D4B9780A" xlink:type="arc" />
    <link:label id="lab_us-gaap_GeneralAndAdministrativeExpense_1E0B1B2C03C8F330F61F8E86D4B9355C_verboseLabel_en-US" xlink:label="lab_us-gaap_GeneralAndAdministrativeExpense_1E0B1B2C03C8F330F61F8E86D4B9355C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">General and administrative</link:label>
    <link:label id="lab_us-gaap_GeneralAndAdministrativeExpense_1E0B1B2C03C8F330F61F8E86D4B9355C_label_en-US" xlink:label="lab_us-gaap_GeneralAndAdministrativeExpense_1E0B1B2C03C8F330F61F8E86D4B9355C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">General and Administrative Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_1E0B1B2C03C8F330F61F8E86D4B9355C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GeneralAndAdministrativeExpense_1E0B1B2C03C8F330F61F8E86D4B9355C" xlink:to="lab_us-gaap_GeneralAndAdministrativeExpense_1E0B1B2C03C8F330F61F8E86D4B9355C" xlink:type="arc" />
    <link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpense_065FBD2ABF9D3068F1988E86D4B94ABD_terseLabel_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpense_065FBD2ABF9D3068F1988E86D4B94ABD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity-based compensation</link:label>
    <link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpense_065FBD2ABF9D3068F1988E86D4B94ABD_label_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpense_065FBD2ABF9D3068F1988E86D4B94ABD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Allocated Share-based Compensation Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_065FBD2ABF9D3068F1988E86D4B94ABD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AllocatedShareBasedCompensationExpense_065FBD2ABF9D3068F1988E86D4B94ABD" xlink:to="lab_us-gaap_AllocatedShareBasedCompensationExpense_065FBD2ABF9D3068F1988E86D4B94ABD" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_BB92818ADBD7A61247BF8E86D4BA3941_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_BB92818ADBD7A61247BF8E86D4BA3941" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, plant and equipment, net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_BB92818ADBD7A61247BF8E86D4BA3941" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_BB92818ADBD7A61247BF8E86D4BA3941" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentNet_BB92818ADBD7A61247BF8E86D4BA3941" xlink:type="arc" />
    <link:label id="lab_us-gaap_Assets_18DF12BC590F7F2C7C198E86D4BAFA29_terseLabel_en-US" xlink:label="lab_us-gaap_Assets_18DF12BC590F7F2C7C198E86D4BAFA29" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_18DF12BC590F7F2C7C198E86D4BAFA29" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Assets_18DF12BC590F7F2C7C198E86D4BAFA29" xlink:to="lab_us-gaap_Assets_18DF12BC590F7F2C7C198E86D4BAFA29" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock_A419BCB5EEB40E0082D0602EBF75A759_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock_A419BCB5EEB40E0082D0602EBF75A759" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Accounts Receivable, Net</link:label>
    <link:label id="lab_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock_A419BCB5EEB40E0082D0602EBF75A759_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock_A419BCB5EEB40E0082D0602EBF75A759" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock_A419BCB5EEB40E0082D0602EBF75A759" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock_A419BCB5EEB40E0082D0602EBF75A759" xlink:to="lab_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock_A419BCB5EEB40E0082D0602EBF75A759" xlink:type="arc" />
    <link:label id="lab_us-gaap_SegmentReportingDisclosureTextBlock_D424FD5921CD3432163B602EBE6462B9_terseLabel_en-US" xlink:label="lab_us-gaap_SegmentReportingDisclosureTextBlock_D424FD5921CD3432163B602EBE6462B9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Business Segment Information</link:label>
    <link:label id="lab_us-gaap_SegmentReportingDisclosureTextBlock_D424FD5921CD3432163B602EBE6462B9_label_en-US" xlink:label="lab_us-gaap_SegmentReportingDisclosureTextBlock_D424FD5921CD3432163B602EBE6462B9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segment Reporting Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentReportingDisclosureTextBlock" xlink:label="loc_us-gaap_SegmentReportingDisclosureTextBlock_D424FD5921CD3432163B602EBE6462B9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SegmentReportingDisclosureTextBlock_D424FD5921CD3432163B602EBE6462B9" xlink:to="lab_us-gaap_SegmentReportingDisclosureTextBlock_D424FD5921CD3432163B602EBE6462B9" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_FCBE010D68A48D76C26C79987B130254_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_FCBE010D68A48D76C26C79987B130254" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Accounts, Notes, Loans and Financing Receivable [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_FCBE010D68A48D76C26C79987B130254_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_FCBE010D68A48D76C26C79987B130254" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Accounts, Notes, Loans and Financing Receivable [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_FCBE010D68A48D76C26C79987B130254" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_FCBE010D68A48D76C26C79987B130254" xlink:to="lab_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_FCBE010D68A48D76C26C79987B130254" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_DDAD4A0C3C5C1CCCA6F779987B1374A2_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_DDAD4A0C3C5C1CCCA6F779987B1374A2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Receivable Type [Axis]</link:label>
    <link:label id="lab_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_DDAD4A0C3C5C1CCCA6F779987B1374A2_label_en-US" xlink:label="lab_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_DDAD4A0C3C5C1CCCA6F779987B1374A2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Receivable Type [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_DDAD4A0C3C5C1CCCA6F779987B1374A2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_DDAD4A0C3C5C1CCCA6F779987B1374A2" xlink:to="lab_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_DDAD4A0C3C5C1CCCA6F779987B1374A2" xlink:type="arc" />
    <link:label id="lab_us-gaap_ReceivableTypeDomain_ACFE65E7B6B1145C53CE79987B1337D4_terseLabel_en-US" xlink:label="lab_us-gaap_ReceivableTypeDomain_ACFE65E7B6B1145C53CE79987B1337D4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Receivable [Domain]</link:label>
    <link:label id="lab_us-gaap_ReceivableTypeDomain_ACFE65E7B6B1145C53CE79987B1337D4_label_en-US" xlink:label="lab_us-gaap_ReceivableTypeDomain_ACFE65E7B6B1145C53CE79987B1337D4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Receivable [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ReceivableTypeDomain" xlink:label="loc_us-gaap_ReceivableTypeDomain_ACFE65E7B6B1145C53CE79987B1337D4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ReceivableTypeDomain_ACFE65E7B6B1145C53CE79987B1337D4" xlink:to="lab_us-gaap_ReceivableTypeDomain_ACFE65E7B6B1145C53CE79987B1337D4" xlink:type="arc" />
    <link:label id="lab_us-gaap_TradeAccountsReceivableMember_66EFAB5F3A1D0E0734F279987B13BDDF_terseLabel_en-US" xlink:label="lab_us-gaap_TradeAccountsReceivableMember_66EFAB5F3A1D0E0734F279987B13BDDF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Trade accounts</link:label>
    <link:label id="lab_us-gaap_TradeAccountsReceivableMember_66EFAB5F3A1D0E0734F279987B13BDDF_label_en-US" xlink:label="lab_us-gaap_TradeAccountsReceivableMember_66EFAB5F3A1D0E0734F279987B13BDDF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trade Accounts Receivable [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TradeAccountsReceivableMember" xlink:label="loc_us-gaap_TradeAccountsReceivableMember_66EFAB5F3A1D0E0734F279987B13BDDF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TradeAccountsReceivableMember_66EFAB5F3A1D0E0734F279987B13BDDF" xlink:to="lab_us-gaap_TradeAccountsReceivableMember_66EFAB5F3A1D0E0734F279987B13BDDF" xlink:type="arc" />
    <link:label id="lab_oas_JointInterestAccountsReceivableMember_655AC0ED77D3D3CD426279987B13A9D2_terseLabel_en-US" xlink:label="lab_oas_JointInterestAccountsReceivableMember_655AC0ED77D3D3CD426279987B13A9D2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Joint interest accounts</link:label>
    <link:label id="lab_oas_JointInterestAccountsReceivableMember_655AC0ED77D3D3CD426279987B13A9D2_label_en-US" xlink:label="lab_oas_JointInterestAccountsReceivableMember_655AC0ED77D3D3CD426279987B13A9D2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Joint Interest Accounts Receivable [Member]</link:label>
    <link:label id="lab_oas_JointInterestAccountsReceivableMember_655AC0ED77D3D3CD426279987B13A9D2_documentation_en-US" xlink:label="lab_oas_JointInterestAccountsReceivableMember_655AC0ED77D3D3CD426279987B13A9D2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Joint Interest Accounts Receivable [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_JointInterestAccountsReceivableMember" xlink:label="loc_oas_JointInterestAccountsReceivableMember_655AC0ED77D3D3CD426279987B13A9D2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_JointInterestAccountsReceivableMember_655AC0ED77D3D3CD426279987B13A9D2" xlink:to="lab_oas_JointInterestAccountsReceivableMember_655AC0ED77D3D3CD426279987B13A9D2" xlink:type="arc" />
    <link:label id="lab_oas_OtherAccountsReceivableMember_1F9F481EF648C5CB6D8879987B131A1E_terseLabel_en-US" xlink:label="lab_oas_OtherAccountsReceivableMember_1F9F481EF648C5CB6D8879987B131A1E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other accounts</link:label>
    <link:label id="lab_oas_OtherAccountsReceivableMember_1F9F481EF648C5CB6D8879987B131A1E_label_en-US" xlink:label="lab_oas_OtherAccountsReceivableMember_1F9F481EF648C5CB6D8879987B131A1E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Accounts Receivable [Member]</link:label>
    <link:label id="lab_oas_OtherAccountsReceivableMember_1F9F481EF648C5CB6D8879987B131A1E_documentation_en-US" xlink:label="lab_oas_OtherAccountsReceivableMember_1F9F481EF648C5CB6D8879987B131A1E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other Accounts Receivable [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_OtherAccountsReceivableMember" xlink:label="loc_oas_OtherAccountsReceivableMember_1F9F481EF648C5CB6D8879987B131A1E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_OtherAccountsReceivableMember_1F9F481EF648C5CB6D8879987B131A1E" xlink:to="lab_oas_OtherAccountsReceivableMember_1F9F481EF648C5CB6D8879987B131A1E" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccountsNotesAndLoansReceivableLineItems_00A1F0FDFFE2F8B88B6779987B134F0A_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsNotesAndLoansReceivableLineItems_00A1F0FDFFE2F8B88B6779987B134F0A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts, Notes, Loans and Financing Receivable [Line Items]</link:label>
    <link:label id="lab_us-gaap_AccountsNotesAndLoansReceivableLineItems_00A1F0FDFFE2F8B88B6779987B134F0A_label_en-US" xlink:label="lab_us-gaap_AccountsNotesAndLoansReceivableLineItems_00A1F0FDFFE2F8B88B6779987B134F0A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts, Notes, Loans and Financing Receivable [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_00A1F0FDFFE2F8B88B6779987B134F0A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_00A1F0FDFFE2F8B88B6779987B134F0A" xlink:to="lab_us-gaap_AccountsNotesAndLoansReceivableLineItems_00A1F0FDFFE2F8B88B6779987B134F0A" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccountsReceivableGrossCurrent_86E6B33E0ABA55D06CF779987B136FC0_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableGrossCurrent_86E6B33E0ABA55D06CF779987B136FC0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts receivable, gross</link:label>
    <link:label id="lab_us-gaap_AccountsReceivableGrossCurrent_86E6B33E0ABA55D06CF779987B136FC0_label_en-US" xlink:label="lab_us-gaap_AccountsReceivableGrossCurrent_86E6B33E0ABA55D06CF779987B136FC0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts Receivable, Gross, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsReceivableGrossCurrent" xlink:label="loc_us-gaap_AccountsReceivableGrossCurrent_86E6B33E0ABA55D06CF779987B136FC0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountsReceivableGrossCurrent_86E6B33E0ABA55D06CF779987B136FC0" xlink:to="lab_us-gaap_AccountsReceivableGrossCurrent_86E6B33E0ABA55D06CF779987B136FC0" xlink:type="arc" />
    <link:label id="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_A9381429B7CD8193644179987B2299C7_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_A9381429B7CD8193644179987B2299C7" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Allowance for doubtful accounts</link:label>
    <link:label id="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_A9381429B7CD8193644179987B2299C7_label_en-US" xlink:label="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_A9381429B7CD8193644179987B2299C7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Allowance for Doubtful Accounts Receivable, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_A9381429B7CD8193644179987B2299C7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_A9381429B7CD8193644179987B2299C7" xlink:to="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_A9381429B7CD8193644179987B2299C7" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccountsReceivableNetCurrent_A8A63569DF673D8240BC79987B2228A2_totalLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_A8A63569DF673D8240BC79987B2228A2" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total accounts receivable, net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_A8A63569DF673D8240BC79987B2228A2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountsReceivableNetCurrent_A8A63569DF673D8240BC79987B2228A2" xlink:to="lab_us-gaap_AccountsReceivableNetCurrent_A8A63569DF673D8240BC79987B2228A2" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_095976FC18035760F5938E86D51DF9DC_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_095976FC18035760F5938E86D51DF9DC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_095976FC18035760F5938E86D51DF9DC_label_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_095976FC18035760F5938E86D51DF9DC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_095976FC18035760F5938E86D51DF9DC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_095976FC18035760F5938E86D51DF9DC" xlink:to="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_095976FC18035760F5938E86D51DF9DC" xlink:type="arc" />
    <link:label id="lab_srt_RangeAxis_257DDE75503F951C2FBD8E86D51DED70_terseLabel_en-US" xlink:label="lab_srt_RangeAxis_257DDE75503F951C2FBD8E86D51DED70" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Range [Axis]</link:label>
    <link:label id="lab_srt_RangeAxis_257DDE75503F951C2FBD8E86D51DED70_label_en-US" xlink:label="lab_srt_RangeAxis_257DDE75503F951C2FBD8E86D51DED70" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Range [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_257DDE75503F951C2FBD8E86D51DED70" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_RangeAxis_257DDE75503F951C2FBD8E86D51DED70" xlink:to="lab_srt_RangeAxis_257DDE75503F951C2FBD8E86D51DED70" xlink:type="arc" />
    <link:label id="lab_srt_RangeMember_66E80B218FF6F08CFA378E86D51D8CA4_terseLabel_en-US" xlink:label="lab_srt_RangeMember_66E80B218FF6F08CFA378E86D51D8CA4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Range [Domain]</link:label>
    <link:label id="lab_srt_RangeMember_66E80B218FF6F08CFA378E86D51D8CA4_label_en-US" xlink:label="lab_srt_RangeMember_66E80B218FF6F08CFA378E86D51D8CA4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Range [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_66E80B218FF6F08CFA378E86D51D8CA4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_RangeMember_66E80B218FF6F08CFA378E86D51D8CA4" xlink:to="lab_srt_RangeMember_66E80B218FF6F08CFA378E86D51D8CA4" xlink:type="arc" />
    <link:label id="lab_srt_MinimumMember_253320D4467608C39F5A8E86D51E025A_terseLabel_en-US" xlink:label="lab_srt_MinimumMember_253320D4467608C39F5A8E86D51E025A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Minimum</link:label>
    <link:label id="lab_srt_MinimumMember_253320D4467608C39F5A8E86D51E025A_label_en-US" xlink:label="lab_srt_MinimumMember_253320D4467608C39F5A8E86D51E025A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Minimum [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_253320D4467608C39F5A8E86D51E025A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_MinimumMember_253320D4467608C39F5A8E86D51E025A" xlink:to="lab_srt_MinimumMember_253320D4467608C39F5A8E86D51E025A" xlink:type="arc" />
    <link:label id="lab_srt_MaximumMember_82FE2A61401CD4AC8D008E86D51E654C_terseLabel_en-US" xlink:label="lab_srt_MaximumMember_82FE2A61401CD4AC8D008E86D51E654C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum</link:label>
    <link:label id="lab_srt_MaximumMember_82FE2A61401CD4AC8D008E86D51E654C_label_en-US" xlink:label="lab_srt_MaximumMember_82FE2A61401CD4AC8D008E86D51E654C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_82FE2A61401CD4AC8D008E86D51E654C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_MaximumMember_82FE2A61401CD4AC8D008E86D51E654C" xlink:to="lab_srt_MaximumMember_82FE2A61401CD4AC8D008E86D51E654C" xlink:type="arc" />
    <link:label id="lab_us-gaap_PerformanceSharesMember_6006755C143FDF5522E38E86D51E647D_terseLabel_en-US" xlink:label="lab_us-gaap_PerformanceSharesMember_6006755C143FDF5522E38E86D51E647D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Performance Share Units</link:label>
    <link:label id="lab_us-gaap_PerformanceSharesMember_6006755C143FDF5522E38E86D51E647D_label_en-US" xlink:label="lab_us-gaap_PerformanceSharesMember_6006755C143FDF5522E38E86D51E647D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Performance Shares [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PerformanceSharesMember" xlink:label="loc_us-gaap_PerformanceSharesMember_6006755C143FDF5522E38E86D51E647D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PerformanceSharesMember_6006755C143FDF5522E38E86D51E647D" xlink:to="lab_us-gaap_PerformanceSharesMember_6006755C143FDF5522E38E86D51E647D" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2B699F69B5BB0AB578978E86D51FF241_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2B699F69B5BB0AB578978E86D51FF241" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2B699F69B5BB0AB578978E86D51FF241_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2B699F69B5BB0AB578978E86D51FF241" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2B699F69B5BB0AB578978E86D51FF241" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2B699F69B5BB0AB578978E86D51FF241" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2B699F69B5BB0AB578978E86D51FF241" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_4BBBB5C616E862516E6F8E86D51F20B8_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_4BBBB5C616E862516E6F8E86D51F20B8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Risk-free interest rate (as percent)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_4BBBB5C616E862516E6F8E86D51F20B8_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_4BBBB5C616E862516E6F8E86D51F20B8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_4BBBB5C616E862516E6F8E86D51F20B8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_4BBBB5C616E862516E6F8E86D51F20B8" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_4BBBB5C616E862516E6F8E86D51F20B8" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_02AA2F73B7FDD4E8B45B8E86D51FB1D6_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_02AA2F73B7FDD4E8B45B8E86D51FB1D6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Oasis volatility (as percent)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_02AA2F73B7FDD4E8B45B8E86D51FB1D6_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_02AA2F73B7FDD4E8B45B8E86D51FB1D6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_02AA2F73B7FDD4E8B45B8E86D51FB1D6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_02AA2F73B7FDD4E8B45B8E86D51FB1D6" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_02AA2F73B7FDD4E8B45B8E86D51FB1D6" xlink:type="arc" />
    <link:label id="lab_oas_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVolumeWeightedAveragePrice_EC830103E4D3ED2FDFF18E86D520E3A7_terseLabel_en-US" xlink:label="lab_oas_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVolumeWeightedAveragePrice_EC830103E4D3ED2FDFF18E86D520E3A7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Oasis initial value (usd per share)</link:label>
    <link:label id="lab_oas_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVolumeWeightedAveragePrice_EC830103E4D3ED2FDFF18E86D520E3A7_label_en-US" xlink:label="lab_oas_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVolumeWeightedAveragePrice_EC830103E4D3ED2FDFF18E86D520E3A7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Volume Weighted Average Price</link:label>
    <link:label id="lab_oas_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVolumeWeightedAveragePrice_EC830103E4D3ED2FDFF18E86D520E3A7_documentation_en-US" xlink:label="lab_oas_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVolumeWeightedAveragePrice_EC830103E4D3ED2FDFF18E86D520E3A7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Volume Weighted Average Price</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVolumeWeightedAveragePrice" xlink:label="loc_oas_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVolumeWeightedAveragePrice_EC830103E4D3ED2FDFF18E86D520E3A7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVolumeWeightedAveragePrice_EC830103E4D3ED2FDFF18E86D520E3A7" xlink:to="lab_oas_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVolumeWeightedAveragePrice_EC830103E4D3ED2FDFF18E86D520E3A7" xlink:type="arc" />
    <link:label id="lab_us-gaap_SharePrice_D1132ED75B616BBB4C9C8E86D52026C6_terseLabel_en-US" xlink:label="lab_us-gaap_SharePrice_D1132ED75B616BBB4C9C8E86D52026C6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Oasis stock price on date of grant (usd per share)</link:label>
    <link:label id="lab_us-gaap_SharePrice_D1132ED75B616BBB4C9C8E86D52026C6_label_en-US" xlink:label="lab_us-gaap_SharePrice_D1132ED75B616BBB4C9C8E86D52026C6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SharePrice" xlink:label="loc_us-gaap_SharePrice_D1132ED75B616BBB4C9C8E86D52026C6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharePrice_D1132ED75B616BBB4C9C8E86D52026C6" xlink:to="lab_us-gaap_SharePrice_D1132ED75B616BBB4C9C8E86D52026C6" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeStatementAbstract_9EE2B6D183299E03E6BA8E86D881B02B_label_en-US" xlink:label="lab_us-gaap_IncomeStatementAbstract_9EE2B6D183299E03E6BA8E86D881B02B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Statement [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeStatementAbstract" xlink:label="loc_us-gaap_IncomeStatementAbstract_9EE2B6D183299E03E6BA8E86D881B02B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeStatementAbstract_9EE2B6D183299E03E6BA8E86D881B02B" xlink:to="lab_us-gaap_IncomeStatementAbstract_9EE2B6D183299E03E6BA8E86D881B02B" xlink:type="arc" />
    <link:label id="lab_us-gaap_StatementTable_41159074645C02C57D948E86D8810785_terseLabel_en-US" xlink:label="lab_us-gaap_StatementTable_41159074645C02C57D948E86D8810785" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Statement [Table]</link:label>
    <link:label id="lab_us-gaap_StatementTable_41159074645C02C57D948E86D8810785_label_en-US" xlink:label="lab_us-gaap_StatementTable_41159074645C02C57D948E86D8810785" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_41159074645C02C57D948E86D8810785" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementTable_41159074645C02C57D948E86D8810785" xlink:to="lab_us-gaap_StatementTable_41159074645C02C57D948E86D8810785" xlink:type="arc" />
    <link:label id="lab_us-gaap_StatementLineItems_FA84632FCE9E1B9921DC8E86D88316D2_terseLabel_en-US" xlink:label="lab_us-gaap_StatementLineItems_FA84632FCE9E1B9921DC8E86D88316D2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Statement [Line Items]</link:label>
    <link:label id="lab_us-gaap_StatementLineItems_FA84632FCE9E1B9921DC8E86D88316D2_label_en-US" xlink:label="lab_us-gaap_StatementLineItems_FA84632FCE9E1B9921DC8E86D88316D2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_FA84632FCE9E1B9921DC8E86D88316D2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementLineItems_FA84632FCE9E1B9921DC8E86D88316D2" xlink:to="lab_us-gaap_StatementLineItems_FA84632FCE9E1B9921DC8E86D88316D2" xlink:type="arc" />
    <link:label id="lab_us-gaap_RevenuesAbstract_AD28AD08F1D69D641E6D8E86D88492AA_terseLabel_en-US" xlink:label="lab_us-gaap_RevenuesAbstract_AD28AD08F1D69D641E6D8E86D88492AA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenues</link:label>
    <link:label id="lab_us-gaap_RevenuesAbstract_AD28AD08F1D69D641E6D8E86D88492AA_label_en-US" xlink:label="lab_us-gaap_RevenuesAbstract_AD28AD08F1D69D641E6D8E86D88492AA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenues [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="loc_us-gaap_RevenuesAbstract_AD28AD08F1D69D641E6D8E86D88492AA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenuesAbstract_AD28AD08F1D69D641E6D8E86D88492AA" xlink:to="lab_us-gaap_RevenuesAbstract_AD28AD08F1D69D641E6D8E86D88492AA" xlink:type="arc" />
    <link:label id="lab_us-gaap_CostsAndExpensesAbstract_7577C3122E70103D63BC8E86D88430FC_terseLabel_en-US" xlink:label="lab_us-gaap_CostsAndExpensesAbstract_7577C3122E70103D63BC8E86D88430FC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating expenses</link:label>
    <link:label id="lab_us-gaap_CostsAndExpensesAbstract_7577C3122E70103D63BC8E86D88430FC_label_en-US" xlink:label="lab_us-gaap_CostsAndExpensesAbstract_7577C3122E70103D63BC8E86D88430FC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Costs and Expenses [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="loc_us-gaap_CostsAndExpensesAbstract_7577C3122E70103D63BC8E86D88430FC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_7577C3122E70103D63BC8E86D88430FC" xlink:to="lab_us-gaap_CostsAndExpensesAbstract_7577C3122E70103D63BC8E86D88430FC" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseExpense_1369C46388C8583C97F68E86D8849AB5_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseExpense_1369C46388C8583C97F68E86D8849AB5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lease operating expenses</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseExpense_1369C46388C8583C97F68E86D8849AB5_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseExpense_1369C46388C8583C97F68E86D8849AB5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseExpense" xlink:label="loc_us-gaap_OperatingLeaseExpense_1369C46388C8583C97F68E86D8849AB5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseExpense_1369C46388C8583C97F68E86D8849AB5" xlink:to="lab_us-gaap_OperatingLeaseExpense_1369C46388C8583C97F68E86D8849AB5" xlink:type="arc" />
    <link:label id="lab_us-gaap_CostOfGoodsAndServicesSold_EBE92BE333A3A9332B968E86D885B772_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfGoodsAndServicesSold_EBE92BE333A3A9332B968E86D885B772" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expenses</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_EBE92BE333A3A9332B968E86D885B772" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostOfGoodsAndServicesSold_EBE92BE333A3A9332B968E86D885B772" xlink:to="lab_us-gaap_CostOfGoodsAndServicesSold_EBE92BE333A3A9332B968E86D885B772" xlink:type="arc" />
    <link:label id="lab_us-gaap_ResultsOfOperationsTransportationCosts_4A5876671681D93A526D8E86D88580F6_terseLabel_en-US" xlink:label="lab_us-gaap_ResultsOfOperationsTransportationCosts_4A5876671681D93A526D8E86D88580F6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Marketing, transportation and gathering expenses</link:label>
    <link:label id="lab_us-gaap_ResultsOfOperationsTransportationCosts_4A5876671681D93A526D8E86D88580F6_label_en-US" xlink:label="lab_us-gaap_ResultsOfOperationsTransportationCosts_4A5876671681D93A526D8E86D88580F6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Results of Operations, Transportation Costs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ResultsOfOperationsTransportationCosts" xlink:label="loc_us-gaap_ResultsOfOperationsTransportationCosts_4A5876671681D93A526D8E86D88580F6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ResultsOfOperationsTransportationCosts_4A5876671681D93A526D8E86D88580F6" xlink:to="lab_us-gaap_ResultsOfOperationsTransportationCosts_4A5876671681D93A526D8E86D88580F6" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProductionTaxExpense_FB713275FD5618E4633D8E86D8853619_terseLabel_en-US" xlink:label="lab_us-gaap_ProductionTaxExpense_FB713275FD5618E4633D8E86D8853619" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Production taxes</link:label>
    <link:label id="lab_us-gaap_ProductionTaxExpense_FB713275FD5618E4633D8E86D8853619_label_en-US" xlink:label="lab_us-gaap_ProductionTaxExpense_FB713275FD5618E4633D8E86D8853619" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Production Tax Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProductionTaxExpense" xlink:label="loc_us-gaap_ProductionTaxExpense_FB713275FD5618E4633D8E86D8853619" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProductionTaxExpense_FB713275FD5618E4633D8E86D8853619" xlink:to="lab_us-gaap_ProductionTaxExpense_FB713275FD5618E4633D8E86D8853619" xlink:type="arc" />
    <link:label id="lab_us-gaap_ExplorationExpense_3F44F34BA3FF632E09E28E86D8858BF0_terseLabel_en-US" xlink:label="lab_us-gaap_ExplorationExpense_3F44F34BA3FF632E09E28E86D8858BF0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exploration expenses</link:label>
    <link:label id="lab_us-gaap_ExplorationExpense_3F44F34BA3FF632E09E28E86D8858BF0_label_en-US" xlink:label="lab_us-gaap_ExplorationExpense_3F44F34BA3FF632E09E28E86D8858BF0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Exploration Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ExplorationExpense" xlink:label="loc_us-gaap_ExplorationExpense_3F44F34BA3FF632E09E28E86D8858BF0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ExplorationExpense_3F44F34BA3FF632E09E28E86D8858BF0" xlink:to="lab_us-gaap_ExplorationExpense_3F44F34BA3FF632E09E28E86D8858BF0" xlink:type="arc" />
    <link:label id="lab_us-gaap_GeneralAndAdministrativeExpense_572F6AADCD2DA9B5793A8E86D886A0D1_terseLabel_en-US" xlink:label="lab_us-gaap_GeneralAndAdministrativeExpense_572F6AADCD2DA9B5793A8E86D886A0D1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">General and administrative expenses</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_572F6AADCD2DA9B5793A8E86D886A0D1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GeneralAndAdministrativeExpense_572F6AADCD2DA9B5793A8E86D886A0D1" xlink:to="lab_us-gaap_GeneralAndAdministrativeExpense_572F6AADCD2DA9B5793A8E86D886A0D1" xlink:type="arc" />
    <link:label id="lab_us-gaap_CostsAndExpenses_88AB29765995A318E1138E86D887A029_totalLabel_en-US" xlink:label="lab_us-gaap_CostsAndExpenses_88AB29765995A318E1138E86D887A029" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total operating expenses</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="loc_us-gaap_CostsAndExpenses_88AB29765995A318E1138E86D887A029" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostsAndExpenses_88AB29765995A318E1138E86D887A029" xlink:to="lab_us-gaap_CostsAndExpenses_88AB29765995A318E1138E86D887A029" xlink:type="arc" />
    <link:label id="lab_us-gaap_GainLossOnSaleOfProperty_D4F4E92BA413E3D2D3EC8E86D887C48A_terseLabel_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfProperty_D4F4E92BA413E3D2D3EC8E86D887C48A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loss on sale of properties</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GainLossOnSaleOfProperty" xlink:label="loc_us-gaap_GainLossOnSaleOfProperty_D4F4E92BA413E3D2D3EC8E86D887C48A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GainLossOnSaleOfProperty_D4F4E92BA413E3D2D3EC8E86D887C48A" xlink:to="lab_us-gaap_GainLossOnSaleOfProperty_D4F4E92BA413E3D2D3EC8E86D887C48A" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingIncomeLoss_8ABDF3CA8CF1861070838E86D8878A24_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_8ABDF3CA8CF1861070838E86D8878A24" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Operating income</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_8ABDF3CA8CF1861070838E86D8878A24" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingIncomeLoss_8ABDF3CA8CF1861070838E86D8878A24" xlink:to="lab_us-gaap_OperatingIncomeLoss_8ABDF3CA8CF1861070838E86D8878A24" xlink:type="arc" />
    <link:label id="lab_us-gaap_NonoperatingIncomeExpenseAbstract_A1B0358E29CBE4F27DF68E86D88732D1_terseLabel_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpenseAbstract_A1B0358E29CBE4F27DF68E86D88732D1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other income (expense)</link:label>
    <link:label id="lab_us-gaap_NonoperatingIncomeExpenseAbstract_A1B0358E29CBE4F27DF68E86D88732D1_label_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpenseAbstract_A1B0358E29CBE4F27DF68E86D88732D1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nonoperating Income (Expense) [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="loc_us-gaap_NonoperatingIncomeExpenseAbstract_A1B0358E29CBE4F27DF68E86D88732D1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_A1B0358E29CBE4F27DF68E86D88732D1" xlink:to="lab_us-gaap_NonoperatingIncomeExpenseAbstract_A1B0358E29CBE4F27DF68E86D88732D1" xlink:type="arc" />
    <link:label id="lab_us-gaap_InterestExpense_CFE7EEFF1C05259940EA8E86D8885F80_negatedLabel_en-US" xlink:label="lab_us-gaap_InterestExpense_CFE7EEFF1C05259940EA8E86D8885F80" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Interest expense, net of capitalized interest</link:label>
    <link:label id="lab_us-gaap_InterestExpense_CFE7EEFF1C05259940EA8E86D8885F80_label_en-US" xlink:label="lab_us-gaap_InterestExpense_CFE7EEFF1C05259940EA8E86D8885F80" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_CFE7EEFF1C05259940EA8E86D8885F80" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestExpense_CFE7EEFF1C05259940EA8E86D8885F80" xlink:to="lab_us-gaap_InterestExpense_CFE7EEFF1C05259940EA8E86D8885F80" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherNonoperatingIncomeExpense_6B028A039C4BAF1943818E86D888ECD4_terseLabel_en-US" xlink:label="lab_us-gaap_OtherNonoperatingIncomeExpense_6B028A039C4BAF1943818E86D888ECD4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other expense</link:label>
    <link:label id="lab_us-gaap_OtherNonoperatingIncomeExpense_6B028A039C4BAF1943818E86D888ECD4_label_en-US" xlink:label="lab_us-gaap_OtherNonoperatingIncomeExpense_6B028A039C4BAF1943818E86D888ECD4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Nonoperating Income (Expense)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_6B028A039C4BAF1943818E86D888ECD4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpense_6B028A039C4BAF1943818E86D888ECD4" xlink:to="lab_us-gaap_OtherNonoperatingIncomeExpense_6B028A039C4BAF1943818E86D888ECD4" xlink:type="arc" />
    <link:label id="lab_us-gaap_NonoperatingIncomeExpense_4D0DAC117A73947EDCBD8E86D888B0F8_totalLabel_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpense_4D0DAC117A73947EDCBD8E86D888B0F8" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total other expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_4D0DAC117A73947EDCBD8E86D888B0F8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_4D0DAC117A73947EDCBD8E86D888B0F8" xlink:to="lab_us-gaap_NonoperatingIncomeExpense_4D0DAC117A73947EDCBD8E86D888B0F8" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeTaxExpenseBenefit_386A0F1DA2A7CCAE710A8E86D889F88A_negatedLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxExpenseBenefit_386A0F1DA2A7CCAE710A8E86D889F88A" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Income tax benefit (expense)</link:label>
    <link:label id="lab_us-gaap_IncomeTaxExpenseBenefit_386A0F1DA2A7CCAE710A8E86D889F88A_label_en-US" xlink:label="lab_us-gaap_IncomeTaxExpenseBenefit_386A0F1DA2A7CCAE710A8E86D889F88A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax Expense (Benefit)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_386A0F1DA2A7CCAE710A8E86D889F88A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_386A0F1DA2A7CCAE710A8E86D889F88A" xlink:to="lab_us-gaap_IncomeTaxExpenseBenefit_386A0F1DA2A7CCAE710A8E86D889F88A" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProfitLoss_C1E898C352D7068C7DB48E86D889439C_totalLabel_en-US" xlink:label="lab_us-gaap_ProfitLoss_C1E898C352D7068C7DB48E86D889439C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net income (loss) including non-controlling interests</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_C1E898C352D7068C7DB48E86D889439C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProfitLoss_C1E898C352D7068C7DB48E86D889439C" xlink:to="lab_us-gaap_ProfitLoss_C1E898C352D7068C7DB48E86D889439C" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_4FDDA60BD46BB4C1C59F8E86D8894B65_terseLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_4FDDA60BD46BB4C1C59F8E86D8894B65" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Less: Net income attributable to non-controlling interests</link:label>
    <link:label id="lab_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_4FDDA60BD46BB4C1C59F8E86D8894B65_label_en-US" xlink:label="lab_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_4FDDA60BD46BB4C1C59F8E86D8894B65" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Income (Loss) Attributable to Noncontrolling Interest</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_4FDDA60BD46BB4C1C59F8E86D8894B65" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_4FDDA60BD46BB4C1C59F8E86D8894B65" xlink:to="lab_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_4FDDA60BD46BB4C1C59F8E86D8894B65" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetIncomeLoss_9933B7C0301F9FD20C888E86D88923CF_totalLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_9933B7C0301F9FD20C888E86D88923CF" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net income (loss) attributable to Oasis</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_9933B7C0301F9FD20C888E86D88923CF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetIncomeLoss_9933B7C0301F9FD20C888E86D88923CF" xlink:to="lab_us-gaap_NetIncomeLoss_9933B7C0301F9FD20C888E86D88923CF" xlink:type="arc" />
    <link:label id="lab_us-gaap_EarningsPerShareAbstract_F10FB3BCBB34C55C9DE88E86D88A8620_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareAbstract_F10FB3BCBB34C55C9DE88E86D88A8620" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Earnings (loss) attributable to Oasis per share:</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_F10FB3BCBB34C55C9DE88E86D88A8620" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareAbstract_F10FB3BCBB34C55C9DE88E86D88A8620" xlink:to="lab_us-gaap_EarningsPerShareAbstract_F10FB3BCBB34C55C9DE88E86D88A8620" xlink:type="arc" />
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_3290D78BC93A7FF6CE7B8E86D88ADDA2_terseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_3290D78BC93A7FF6CE7B8E86D88ADDA2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average shares outstanding:</link:label>
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_3290D78BC93A7FF6CE7B8E86D88ADDA2_label_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_3290D78BC93A7FF6CE7B8E86D88ADDA2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Number of Shares Outstanding, Diluted [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_3290D78BC93A7FF6CE7B8E86D88ADDA2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_3290D78BC93A7FF6CE7B8E86D88ADDA2" xlink:to="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_3290D78BC93A7FF6CE7B8E86D88ADDA2" xlink:type="arc" />
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_A044A3EED8E4A29D727E8E86D88A04F1_terseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_A044A3EED8E4A29D727E8E86D88A04F1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basic (in shares)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_A044A3EED8E4A29D727E8E86D88A04F1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_A044A3EED8E4A29D727E8E86D88A04F1" xlink:to="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_A044A3EED8E4A29D727E8E86D88A04F1" xlink:type="arc" />
    <link:label id="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_97B58FD200B1DF4CC6CD8E86D88BF697_terseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_97B58FD200B1DF4CC6CD8E86D88BF697" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Diluted (in shares)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_97B58FD200B1DF4CC6CD8E86D88BF697" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_97B58FD200B1DF4CC6CD8E86D88BF697" xlink:to="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_97B58FD200B1DF4CC6CD8E86D88BF697" xlink:type="arc" />
    <link:label id="lab_us-gaap_EarningsPerShareTextBlock_F35B31BEE2829BEC05E8602EBE74101F_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareTextBlock_F35B31BEE2829BEC05E8602EBE74101F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Earnings (Loss) Per Share</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareTextBlock_F35B31BEE2829BEC05E8602EBE74101F_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareTextBlock_F35B31BEE2829BEC05E8602EBE74101F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EarningsPerShareTextBlock" xlink:label="loc_us-gaap_EarningsPerShareTextBlock_F35B31BEE2829BEC05E8602EBE74101F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareTextBlock_F35B31BEE2829BEC05E8602EBE74101F" xlink:to="lab_us-gaap_EarningsPerShareTextBlock_F35B31BEE2829BEC05E8602EBE74101F" xlink:type="arc" />
    <link:label id="lab_us-gaap_LeaseCostAbstract_4D66A994C7731B5E71ED8E86D466A194_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseCostAbstract_4D66A994C7731B5E71ED8E86D466A194" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lease, Cost [Abstract]</link:label>
    <link:label id="lab_us-gaap_LeaseCostAbstract_4D66A994C7731B5E71ED8E86D466A194_label_en-US" xlink:label="lab_us-gaap_LeaseCostAbstract_4D66A994C7731B5E71ED8E86D466A194" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease, Cost [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LeaseCostAbstract" xlink:label="loc_us-gaap_LeaseCostAbstract_4D66A994C7731B5E71ED8E86D466A194" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseCostAbstract_4D66A994C7731B5E71ED8E86D466A194" xlink:to="lab_us-gaap_LeaseCostAbstract_4D66A994C7731B5E71ED8E86D466A194" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseCost_1697D15D81B807F87DE18E86D466A62B_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseCost_1697D15D81B807F87DE18E86D466A62B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating lease costs</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseCost_1697D15D81B807F87DE18E86D466A62B_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseCost_1697D15D81B807F87DE18E86D466A62B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Cost</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseCost" xlink:label="loc_us-gaap_OperatingLeaseCost_1697D15D81B807F87DE18E86D466A62B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseCost_1697D15D81B807F87DE18E86D466A62B" xlink:to="lab_us-gaap_OperatingLeaseCost_1697D15D81B807F87DE18E86D466A62B" xlink:type="arc" />
    <link:label id="lab_us-gaap_VariableLeaseCost_B9EF47ADE345918A648E8E86D466DF7F_terseLabel_en-US" xlink:label="lab_us-gaap_VariableLeaseCost_B9EF47ADE345918A648E8E86D466DF7F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Variable lease costs</link:label>
    <link:label id="lab_us-gaap_VariableLeaseCost_B9EF47ADE345918A648E8E86D466DF7F_label_en-US" xlink:label="lab_us-gaap_VariableLeaseCost_B9EF47ADE345918A648E8E86D466DF7F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Lease, Cost</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableLeaseCost" xlink:label="loc_us-gaap_VariableLeaseCost_B9EF47ADE345918A648E8E86D466DF7F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableLeaseCost_B9EF47ADE345918A648E8E86D466DF7F" xlink:to="lab_us-gaap_VariableLeaseCost_B9EF47ADE345918A648E8E86D466DF7F" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShortTermLeaseCost_D06F68B13E8ED0F9E6438E86D467ACCA_terseLabel_en-US" xlink:label="lab_us-gaap_ShortTermLeaseCost_D06F68B13E8ED0F9E6438E86D467ACCA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Short-term lease costs</link:label>
    <link:label id="lab_us-gaap_ShortTermLeaseCost_D06F68B13E8ED0F9E6438E86D467ACCA_label_en-US" xlink:label="lab_us-gaap_ShortTermLeaseCost_D06F68B13E8ED0F9E6438E86D467ACCA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Short-term Lease, Cost</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShortTermLeaseCost" xlink:label="loc_us-gaap_ShortTermLeaseCost_D06F68B13E8ED0F9E6438E86D467ACCA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShortTermLeaseCost_D06F68B13E8ED0F9E6438E86D467ACCA" xlink:to="lab_us-gaap_ShortTermLeaseCost_D06F68B13E8ED0F9E6438E86D467ACCA" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseCostAbstract_D2DF79C727BD56D15C608E86D467A9C0_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseCostAbstract_D2DF79C727BD56D15C608E86D467A9C0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finance lease costs:</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseCostAbstract_D2DF79C727BD56D15C608E86D467A9C0_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseCostAbstract_D2DF79C727BD56D15C608E86D467A9C0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Cost [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseCostAbstract" xlink:label="loc_us-gaap_FinanceLeaseCostAbstract_D2DF79C727BD56D15C608E86D467A9C0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseCostAbstract_D2DF79C727BD56D15C608E86D467A9C0" xlink:to="lab_us-gaap_FinanceLeaseCostAbstract_D2DF79C727BD56D15C608E86D467A9C0" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseRightOfUseAssetAmortization_D4158B8035EA91DCE04A8E86D46776F4_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseRightOfUseAssetAmortization_D4158B8035EA91DCE04A8E86D46776F4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization of ROU assets</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseRightOfUseAssetAmortization_D4158B8035EA91DCE04A8E86D46776F4_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseRightOfUseAssetAmortization_D4158B8035EA91DCE04A8E86D46776F4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Right-of-Use Asset, Amortization</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAssetAmortization" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetAmortization_D4158B8035EA91DCE04A8E86D46776F4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseRightOfUseAssetAmortization_D4158B8035EA91DCE04A8E86D46776F4" xlink:to="lab_us-gaap_FinanceLeaseRightOfUseAssetAmortization_D4158B8035EA91DCE04A8E86D46776F4" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseInterestExpense_401E70CA7FD0241AB2D48E86D467D6FE_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseInterestExpense_401E70CA7FD0241AB2D48E86D467D6FE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest on lease liabilities</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseInterestExpense_401E70CA7FD0241AB2D48E86D467D6FE_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseInterestExpense_401E70CA7FD0241AB2D48E86D467D6FE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Interest Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseInterestExpense" xlink:label="loc_us-gaap_FinanceLeaseInterestExpense_401E70CA7FD0241AB2D48E86D467D6FE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseInterestExpense_401E70CA7FD0241AB2D48E86D467D6FE" xlink:to="lab_us-gaap_FinanceLeaseInterestExpense_401E70CA7FD0241AB2D48E86D467D6FE" xlink:type="arc" />
    <link:label id="lab_oas_FinanceLeaseCost_20299099AAE1ED93D89A8E86D46D284C_totalLabel_en-US" xlink:label="lab_oas_FinanceLeaseCost_20299099AAE1ED93D89A8E86D46D284C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total finance lease costs</link:label>
    <link:label id="lab_oas_FinanceLeaseCost_20299099AAE1ED93D89A8E86D46D284C_label_en-US" xlink:label="lab_oas_FinanceLeaseCost_20299099AAE1ED93D89A8E86D46D284C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Cost</link:label>
    <link:label id="lab_oas_FinanceLeaseCost_20299099AAE1ED93D89A8E86D46D284C_documentation_en-US" xlink:label="lab_oas_FinanceLeaseCost_20299099AAE1ED93D89A8E86D46D284C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Finance Lease, Cost</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_FinanceLeaseCost" xlink:label="loc_oas_FinanceLeaseCost_20299099AAE1ED93D89A8E86D46D284C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_FinanceLeaseCost_20299099AAE1ED93D89A8E86D46D284C" xlink:to="lab_oas_FinanceLeaseCost_20299099AAE1ED93D89A8E86D46D284C" xlink:type="arc" />
    <link:label id="lab_us-gaap_LeaseCost_273CDA316095E732994E8E86D46D456E_totalLabel_en-US" xlink:label="lab_us-gaap_LeaseCost_273CDA316095E732994E8E86D46D456E" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total lease costs</link:label>
    <link:label id="lab_us-gaap_LeaseCost_273CDA316095E732994E8E86D46D456E_label_en-US" xlink:label="lab_us-gaap_LeaseCost_273CDA316095E732994E8E86D46D456E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease, Cost</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LeaseCost" xlink:label="loc_us-gaap_LeaseCost_273CDA316095E732994E8E86D46D456E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseCost_273CDA316095E732994E8E86D46D456E" xlink:to="lab_us-gaap_LeaseCost_273CDA316095E732994E8E86D46D456E" xlink:type="arc" />
    <link:label id="lab_oas_DocumentAndEntityInformationAbstract_3A293C1F7ED9DF6E2BD4602EC0C963AC_label_en-US" xlink:label="lab_oas_DocumentAndEntityInformationAbstract_3A293C1F7ED9DF6E2BD4602EC0C963AC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document And Entity Information [Abstract]</link:label>
    <link:label id="lab_oas_DocumentAndEntityInformationAbstract_3A293C1F7ED9DF6E2BD4602EC0C963AC_documentation_en-US" xlink:label="lab_oas_DocumentAndEntityInformationAbstract_3A293C1F7ED9DF6E2BD4602EC0C963AC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Document and Entity Information [Abstract]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_DocumentAndEntityInformationAbstract" xlink:label="loc_oas_DocumentAndEntityInformationAbstract_3A293C1F7ED9DF6E2BD4602EC0C963AC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_DocumentAndEntityInformationAbstract_3A293C1F7ED9DF6E2BD4602EC0C963AC" xlink:to="lab_oas_DocumentAndEntityInformationAbstract_3A293C1F7ED9DF6E2BD4602EC0C963AC" xlink:type="arc" />
    <link:label id="lab_dei_DocumentType_3F2CC089B2E58F33A120602EC0C96150_terseLabel_en-US" xlink:label="lab_dei_DocumentType_3F2CC089B2E58F33A120602EC0C96150" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Type</link:label>
    <link:label id="lab_dei_DocumentType_3F2CC089B2E58F33A120602EC0C96150_label_en-US" xlink:label="lab_dei_DocumentType_3F2CC089B2E58F33A120602EC0C96150" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Type</link:label>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_DocumentType" xlink:label="loc_dei_DocumentType_3F2CC089B2E58F33A120602EC0C96150" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentType_3F2CC089B2E58F33A120602EC0C96150" xlink:to="lab_dei_DocumentType_3F2CC089B2E58F33A120602EC0C96150" xlink:type="arc" />
    <link:label id="lab_dei_AmendmentFlag_55A7967AE28FF4C68346602EC0C9AFCB_terseLabel_en-US" xlink:label="lab_dei_AmendmentFlag_55A7967AE28FF4C68346602EC0C9AFCB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amendment Flag</link:label>
    <link:label id="lab_dei_AmendmentFlag_55A7967AE28FF4C68346602EC0C9AFCB_label_en-US" xlink:label="lab_dei_AmendmentFlag_55A7967AE28FF4C68346602EC0C9AFCB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amendment Flag</link:label>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_AmendmentFlag" xlink:label="loc_dei_AmendmentFlag_55A7967AE28FF4C68346602EC0C9AFCB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AmendmentFlag_55A7967AE28FF4C68346602EC0C9AFCB" xlink:to="lab_dei_AmendmentFlag_55A7967AE28FF4C68346602EC0C9AFCB" xlink:type="arc" />
    <link:label id="lab_dei_DocumentPeriodEndDate_7A536FFF7CB4720E8DB6602EC0C90A05_terseLabel_en-US" xlink:label="lab_dei_DocumentPeriodEndDate_7A536FFF7CB4720E8DB6602EC0C90A05" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Period End Date</link:label>
    <link:label id="lab_dei_DocumentPeriodEndDate_7A536FFF7CB4720E8DB6602EC0C90A05_label_en-US" xlink:label="lab_dei_DocumentPeriodEndDate_7A536FFF7CB4720E8DB6602EC0C90A05" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Period End Date</link:label>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="loc_dei_DocumentPeriodEndDate_7A536FFF7CB4720E8DB6602EC0C90A05" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentPeriodEndDate_7A536FFF7CB4720E8DB6602EC0C90A05" xlink:to="lab_dei_DocumentPeriodEndDate_7A536FFF7CB4720E8DB6602EC0C90A05" xlink:type="arc" />
    <link:label id="lab_dei_DocumentFiscalYearFocus_CFCA3E1B557BDB9D3FEE602EC0C90D31_terseLabel_en-US" xlink:label="lab_dei_DocumentFiscalYearFocus_CFCA3E1B557BDB9D3FEE602EC0C90D31" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Fiscal Year Focus</link:label>
    <link:label id="lab_dei_DocumentFiscalYearFocus_CFCA3E1B557BDB9D3FEE602EC0C90D31_label_en-US" xlink:label="lab_dei_DocumentFiscalYearFocus_CFCA3E1B557BDB9D3FEE602EC0C90D31" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Fiscal Year Focus</link:label>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:label="loc_dei_DocumentFiscalYearFocus_CFCA3E1B557BDB9D3FEE602EC0C90D31" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentFiscalYearFocus_CFCA3E1B557BDB9D3FEE602EC0C90D31" xlink:to="lab_dei_DocumentFiscalYearFocus_CFCA3E1B557BDB9D3FEE602EC0C90D31" xlink:type="arc" />
    <link:label id="lab_dei_DocumentFiscalPeriodFocus_2B12ABF3DB9E594BA19A602EC0C985EC_terseLabel_en-US" xlink:label="lab_dei_DocumentFiscalPeriodFocus_2B12ABF3DB9E594BA19A602EC0C985EC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Fiscal Period Focus</link:label>
    <link:label id="lab_dei_DocumentFiscalPeriodFocus_2B12ABF3DB9E594BA19A602EC0C985EC_label_en-US" xlink:label="lab_dei_DocumentFiscalPeriodFocus_2B12ABF3DB9E594BA19A602EC0C985EC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Fiscal Period Focus</link:label>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="loc_dei_DocumentFiscalPeriodFocus_2B12ABF3DB9E594BA19A602EC0C985EC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentFiscalPeriodFocus_2B12ABF3DB9E594BA19A602EC0C985EC" xlink:to="lab_dei_DocumentFiscalPeriodFocus_2B12ABF3DB9E594BA19A602EC0C985EC" xlink:type="arc" />
    <link:label id="lab_dei_TradingSymbol_5F425D13B19E345F4E85602EC0C9A27E_terseLabel_en-US" xlink:label="lab_dei_TradingSymbol_5F425D13B19E345F4E85602EC0C9A27E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Trading Symbol</link:label>
    <link:label id="lab_dei_TradingSymbol_5F425D13B19E345F4E85602EC0C9A27E_label_en-US" xlink:label="lab_dei_TradingSymbol_5F425D13B19E345F4E85602EC0C9A27E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trading Symbol</link:label>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_TradingSymbol" xlink:label="loc_dei_TradingSymbol_5F425D13B19E345F4E85602EC0C9A27E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_TradingSymbol_5F425D13B19E345F4E85602EC0C9A27E" xlink:to="lab_dei_TradingSymbol_5F425D13B19E345F4E85602EC0C9A27E" xlink:type="arc" />
    <link:label id="lab_dei_EntityRegistrantName_D4153219FF232545BF4C602EC0D8AC0F_terseLabel_en-US" xlink:label="lab_dei_EntityRegistrantName_D4153219FF232545BF4C602EC0D8AC0F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Registrant Name</link:label>
    <link:label id="lab_dei_EntityRegistrantName_D4153219FF232545BF4C602EC0D8AC0F_label_en-US" xlink:label="lab_dei_EntityRegistrantName_D4153219FF232545BF4C602EC0D8AC0F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Registrant Name</link:label>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_EntityRegistrantName" xlink:label="loc_dei_EntityRegistrantName_D4153219FF232545BF4C602EC0D8AC0F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityRegistrantName_D4153219FF232545BF4C602EC0D8AC0F" xlink:to="lab_dei_EntityRegistrantName_D4153219FF232545BF4C602EC0D8AC0F" xlink:type="arc" />
    <link:label id="lab_dei_EntityCentralIndexKey_22E0BB8C4F642B79F15F602EC0D868A5_terseLabel_en-US" xlink:label="lab_dei_EntityCentralIndexKey_22E0BB8C4F642B79F15F602EC0D868A5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Central Index Key</link:label>
    <link:label id="lab_dei_EntityCentralIndexKey_22E0BB8C4F642B79F15F602EC0D868A5_label_en-US" xlink:label="lab_dei_EntityCentralIndexKey_22E0BB8C4F642B79F15F602EC0D868A5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Central Index Key</link:label>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="loc_dei_EntityCentralIndexKey_22E0BB8C4F642B79F15F602EC0D868A5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCentralIndexKey_22E0BB8C4F642B79F15F602EC0D868A5" xlink:to="lab_dei_EntityCentralIndexKey_22E0BB8C4F642B79F15F602EC0D868A5" xlink:type="arc" />
    <link:label id="lab_dei_CurrentFiscalYearEndDate_B5C318AFBE39D84EE976602EC0D8DACA_terseLabel_en-US" xlink:label="lab_dei_CurrentFiscalYearEndDate_B5C318AFBE39D84EE976602EC0D8DACA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current Fiscal Year End Date</link:label>
    <link:label id="lab_dei_CurrentFiscalYearEndDate_B5C318AFBE39D84EE976602EC0D8DACA_label_en-US" xlink:label="lab_dei_CurrentFiscalYearEndDate_B5C318AFBE39D84EE976602EC0D8DACA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current Fiscal Year End Date</link:label>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_CurrentFiscalYearEndDate" xlink:label="loc_dei_CurrentFiscalYearEndDate_B5C318AFBE39D84EE976602EC0D8DACA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_CurrentFiscalYearEndDate_B5C318AFBE39D84EE976602EC0D8DACA" xlink:to="lab_dei_CurrentFiscalYearEndDate_B5C318AFBE39D84EE976602EC0D8DACA" xlink:type="arc" />
    <link:label id="lab_dei_EntityFilerCategory_6B21CDBAD3DCF603A793602EC0D8C45F_terseLabel_en-US" xlink:label="lab_dei_EntityFilerCategory_6B21CDBAD3DCF603A793602EC0D8C45F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Filer Category</link:label>
    <link:label id="lab_dei_EntityFilerCategory_6B21CDBAD3DCF603A793602EC0D8C45F_label_en-US" xlink:label="lab_dei_EntityFilerCategory_6B21CDBAD3DCF603A793602EC0D8C45F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Filer Category</link:label>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_EntityFilerCategory" xlink:label="loc_dei_EntityFilerCategory_6B21CDBAD3DCF603A793602EC0D8C45F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityFilerCategory_6B21CDBAD3DCF603A793602EC0D8C45F" xlink:to="lab_dei_EntityFilerCategory_6B21CDBAD3DCF603A793602EC0D8C45F" xlink:type="arc" />
    <link:label id="lab_dei_EntitySmallBusiness_BD1916135942C5B376FA602EC0D8EFFE_terseLabel_en-US" xlink:label="lab_dei_EntitySmallBusiness_BD1916135942C5B376FA602EC0D8EFFE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Small Business</link:label>
    <link:label id="lab_dei_EntitySmallBusiness_BD1916135942C5B376FA602EC0D8EFFE_label_en-US" xlink:label="lab_dei_EntitySmallBusiness_BD1916135942C5B376FA602EC0D8EFFE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Small Business</link:label>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_EntitySmallBusiness" xlink:label="loc_dei_EntitySmallBusiness_BD1916135942C5B376FA602EC0D8EFFE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntitySmallBusiness_BD1916135942C5B376FA602EC0D8EFFE" xlink:to="lab_dei_EntitySmallBusiness_BD1916135942C5B376FA602EC0D8EFFE" xlink:type="arc" />
    <link:label id="lab_dei_EntityEmergingGrowthCompany_0A1FD272960A7C5F332A602EC0D8F1D9_terseLabel_en-US" xlink:label="lab_dei_EntityEmergingGrowthCompany_0A1FD272960A7C5F332A602EC0D8F1D9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Emerging Growth Company</link:label>
    <link:label id="lab_dei_EntityEmergingGrowthCompany_0A1FD272960A7C5F332A602EC0D8F1D9_label_en-US" xlink:label="lab_dei_EntityEmergingGrowthCompany_0A1FD272960A7C5F332A602EC0D8F1D9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Emerging Growth Company</link:label>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_EntityEmergingGrowthCompany" xlink:label="loc_dei_EntityEmergingGrowthCompany_0A1FD272960A7C5F332A602EC0D8F1D9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityEmergingGrowthCompany_0A1FD272960A7C5F332A602EC0D8F1D9" xlink:to="lab_dei_EntityEmergingGrowthCompany_0A1FD272960A7C5F332A602EC0D8F1D9" xlink:type="arc" />
    <link:label id="lab_dei_EntityCommonStockSharesOutstanding_19FDF6F059694CB4D1AE602EC0D8B674_terseLabel_en-US" xlink:label="lab_dei_EntityCommonStockSharesOutstanding_19FDF6F059694CB4D1AE602EC0D8B674" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Common Stock, Shares Outstanding</link:label>
    <link:label id="lab_dei_EntityCommonStockSharesOutstanding_19FDF6F059694CB4D1AE602EC0D8B674_label_en-US" xlink:label="lab_dei_EntityCommonStockSharesOutstanding_19FDF6F059694CB4D1AE602EC0D8B674" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Common Stock, Shares Outstanding</link:label>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_19FDF6F059694CB4D1AE602EC0D8B674" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCommonStockSharesOutstanding_19FDF6F059694CB4D1AE602EC0D8B674" xlink:to="lab_dei_EntityCommonStockSharesOutstanding_19FDF6F059694CB4D1AE602EC0D8B674" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_1F0334A7569C320497B8794F96A2506E_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_1F0334A7569C320497B8794F96A2506E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_1F0334A7569C320497B8794F96A2506E_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_1F0334A7569C320497B8794F96A2506E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments Due, Next Twelve Months</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_1F0334A7569C320497B8794F96A2506E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_1F0334A7569C320497B8794F96A2506E" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_1F0334A7569C320497B8794F96A2506E" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_4851F5844E61C78C460D794F96A2F564_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_4851F5844E61C78C460D794F96A2F564" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_4851F5844E61C78C460D794F96A2F564_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_4851F5844E61C78C460D794F96A2F564" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due in Two Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_4851F5844E61C78C460D794F96A2F564" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_4851F5844E61C78C460D794F96A2F564" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_4851F5844E61C78C460D794F96A2F564" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_D6711E0D68C644A0B956794F96A25A27_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_D6711E0D68C644A0B956794F96A25A27" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_D6711E0D68C644A0B956794F96A25A27_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_D6711E0D68C644A0B956794F96A25A27" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due in Three Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_D6711E0D68C644A0B956794F96A25A27" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_D6711E0D68C644A0B956794F96A25A27" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_D6711E0D68C644A0B956794F96A25A27" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_53C4C5F2FDC0628980CA794F96A2A876_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_53C4C5F2FDC0628980CA794F96A2A876" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2022</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_53C4C5F2FDC0628980CA794F96A2A876_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_53C4C5F2FDC0628980CA794F96A2A876" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due in Four Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_53C4C5F2FDC0628980CA794F96A2A876" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_53C4C5F2FDC0628980CA794F96A2A876" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_53C4C5F2FDC0628980CA794F96A2A876" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_D62B2E669BE005F244BA794F96A3F9F0_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_D62B2E669BE005F244BA794F96A3F9F0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2023</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_D62B2E669BE005F244BA794F96A3F9F0_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_D62B2E669BE005F244BA794F96A3F9F0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due in Five Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_D62B2E669BE005F244BA794F96A3F9F0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_D62B2E669BE005F244BA794F96A3F9F0" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_D62B2E669BE005F244BA794F96A3F9F0" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_2EFEFA9385523AB54DBC794F96A38A5B_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_2EFEFA9385523AB54DBC794F96A38A5B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Thereafter</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_2EFEFA9385523AB54DBC794F96A38A5B_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_2EFEFA9385523AB54DBC794F96A38A5B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due Thereafter</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_2EFEFA9385523AB54DBC794F96A38A5B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_2EFEFA9385523AB54DBC794F96A38A5B" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_2EFEFA9385523AB54DBC794F96A38A5B" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_3075A02EB1D317F4F491794F96A367A4_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_3075A02EB1D317F4F491794F96A367A4" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total future minimum lease payments</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_3075A02EB1D317F4F491794F96A367A4_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_3075A02EB1D317F4F491794F96A367A4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments Due</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_3075A02EB1D317F4F491794F96A367A4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_3075A02EB1D317F4F491794F96A367A4" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_3075A02EB1D317F4F491794F96A367A4" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_A108E764B51EE496DBF77A4548E05FB3_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_A108E764B51EE496DBF77A4548E05FB3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_A108E764B51EE496DBF77A4548E05FB3_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_A108E764B51EE496DBF77A4548E05FB3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_A108E764B51EE496DBF77A4548E05FB3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_A108E764B51EE496DBF77A4548E05FB3" xlink:to="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_A108E764B51EE496DBF77A4548E05FB3" xlink:type="arc" />
    <link:label id="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_BABE12BAED7F6FE7E2027A4548E979B6_terseLabel_en-US" xlink:label="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_BABE12BAED7F6FE7E2027A4548E979B6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Antidilutive Securities [Axis]</link:label>
    <link:label id="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_BABE12BAED7F6FE7E2027A4548E979B6_label_en-US" xlink:label="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_BABE12BAED7F6FE7E2027A4548E979B6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Antidilutive Securities [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_BABE12BAED7F6FE7E2027A4548E979B6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_BABE12BAED7F6FE7E2027A4548E979B6" xlink:to="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_BABE12BAED7F6FE7E2027A4548E979B6" xlink:type="arc" />
    <link:label id="lab_us-gaap_AntidilutiveSecuritiesNameDomain_9566E649C9CB30A804237A4548EA8446_terseLabel_en-US" xlink:label="lab_us-gaap_AntidilutiveSecuritiesNameDomain_9566E649C9CB30A804237A4548EA8446" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Antidilutive Securities, Name [Domain]</link:label>
    <link:label id="lab_us-gaap_AntidilutiveSecuritiesNameDomain_9566E649C9CB30A804237A4548EA8446_label_en-US" xlink:label="lab_us-gaap_AntidilutiveSecuritiesNameDomain_9566E649C9CB30A804237A4548EA8446" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Antidilutive Securities, Name [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_9566E649C9CB30A804237A4548EA8446" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_9566E649C9CB30A804237A4548EA8446" xlink:to="lab_us-gaap_AntidilutiveSecuritiesNameDomain_9566E649C9CB30A804237A4548EA8446" xlink:type="arc" />
    <link:label id="lab_oas_UnvestedStockAwardsMember_FA1FA15629AD5CBA4BA37A454A9DCF12_terseLabel_en-US" xlink:label="lab_oas_UnvestedStockAwardsMember_FA1FA15629AD5CBA4BA37A454A9DCF12" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unvested Stock Awards</link:label>
    <link:label id="lab_oas_UnvestedStockAwardsMember_FA1FA15629AD5CBA4BA37A454A9DCF12_label_en-US" xlink:label="lab_oas_UnvestedStockAwardsMember_FA1FA15629AD5CBA4BA37A454A9DCF12" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unvested Stock Awards [Member]</link:label>
    <link:label id="lab_oas_UnvestedStockAwardsMember_FA1FA15629AD5CBA4BA37A454A9DCF12_documentation_en-US" xlink:label="lab_oas_UnvestedStockAwardsMember_FA1FA15629AD5CBA4BA37A454A9DCF12" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Unvested Stock Awards [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_UnvestedStockAwardsMember" xlink:label="loc_oas_UnvestedStockAwardsMember_FA1FA15629AD5CBA4BA37A454A9DCF12" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_UnvestedStockAwardsMember_FA1FA15629AD5CBA4BA37A454A9DCF12" xlink:to="lab_oas_UnvestedStockAwardsMember_FA1FA15629AD5CBA4BA37A454A9DCF12" xlink:type="arc" />
    <link:label id="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_6F28C9690E9F8D54E9237A4548EBEFC5_terseLabel_en-US" xlink:label="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_6F28C9690E9F8D54E9237A4548EBEFC5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]</link:label>
    <link:label id="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_6F28C9690E9F8D54E9237A4548EBEFC5_label_en-US" xlink:label="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_6F28C9690E9F8D54E9237A4548EBEFC5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_6F28C9690E9F8D54E9237A4548EBEFC5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_6F28C9690E9F8D54E9237A4548EBEFC5" xlink:to="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_6F28C9690E9F8D54E9237A4548EBEFC5" xlink:type="arc" />
    <link:label id="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_67392FEB48F5220B5D497A2A5E008E33_terseLabel_en-US" xlink:label="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_67392FEB48F5220B5D497A2A5E008E33" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Anti-dilutive stock-based compensation awards (in shares)</link:label>
    <link:label id="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_67392FEB48F5220B5D497A2A5E008E33_label_en-US" xlink:label="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_67392FEB48F5220B5D497A2A5E008E33" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_67392FEB48F5220B5D497A2A5E008E33" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_67392FEB48F5220B5D497A2A5E008E33" xlink:to="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_67392FEB48F5220B5D497A2A5E008E33" xlink:type="arc" />
    <link:label id="lab_us-gaap_InventoryDisclosureTextBlock_7EC9545BA1ED44C5EFED602EBF85D6B5_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryDisclosureTextBlock_7EC9545BA1ED44C5EFED602EBF85D6B5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Inventory</link:label>
    <link:label id="lab_us-gaap_InventoryDisclosureTextBlock_7EC9545BA1ED44C5EFED602EBF85D6B5_label_en-US" xlink:label="lab_us-gaap_InventoryDisclosureTextBlock_7EC9545BA1ED44C5EFED602EBF85D6B5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryDisclosureTextBlock" xlink:label="loc_us-gaap_InventoryDisclosureTextBlock_7EC9545BA1ED44C5EFED602EBF85D6B5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryDisclosureTextBlock_7EC9545BA1ED44C5EFED602EBF85D6B5" xlink:to="lab_us-gaap_InventoryDisclosureTextBlock_7EC9545BA1ED44C5EFED602EBF85D6B5" xlink:type="arc" />
    <link:label id="lab_us-gaap_StatementOfStockholdersEquityAbstract_338E979D759E672ABB1B989716061BD9_label_en-US" xlink:label="lab_us-gaap_StatementOfStockholdersEquityAbstract_338E979D759E672ABB1B989716061BD9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Stockholders' Equity [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementOfStockholdersEquityAbstract" xlink:label="loc_us-gaap_StatementOfStockholdersEquityAbstract_338E979D759E672ABB1B989716061BD9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementOfStockholdersEquityAbstract_338E979D759E672ABB1B989716061BD9" xlink:to="lab_us-gaap_StatementOfStockholdersEquityAbstract_338E979D759E672ABB1B989716061BD9" xlink:type="arc" />
    <link:label id="lab_us-gaap_StatementEquityComponentsAxis_91BA463F606C9B72D4F1989716078D64_terseLabel_en-US" xlink:label="lab_us-gaap_StatementEquityComponentsAxis_91BA463F606C9B72D4F1989716078D64" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity Components [Axis]</link:label>
    <link:label id="lab_us-gaap_StatementEquityComponentsAxis_91BA463F606C9B72D4F1989716078D64_label_en-US" xlink:label="lab_us-gaap_StatementEquityComponentsAxis_91BA463F606C9B72D4F1989716078D64" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Components [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_91BA463F606C9B72D4F1989716078D64" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_91BA463F606C9B72D4F1989716078D64" xlink:to="lab_us-gaap_StatementEquityComponentsAxis_91BA463F606C9B72D4F1989716078D64" xlink:type="arc" />
    <link:label id="lab_us-gaap_EquityComponentDomain_C8353263C1A691DFB3EF9897160754A1_terseLabel_en-US" xlink:label="lab_us-gaap_EquityComponentDomain_C8353263C1A691DFB3EF9897160754A1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity Component [Domain]</link:label>
    <link:label id="lab_us-gaap_EquityComponentDomain_C8353263C1A691DFB3EF9897160754A1_label_en-US" xlink:label="lab_us-gaap_EquityComponentDomain_C8353263C1A691DFB3EF9897160754A1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Component [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_C8353263C1A691DFB3EF9897160754A1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EquityComponentDomain_C8353263C1A691DFB3EF9897160754A1" xlink:to="lab_us-gaap_EquityComponentDomain_C8353263C1A691DFB3EF9897160754A1" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommonStockMember_3752478553E17FCB872A989716085740_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockMember_3752478553E17FCB872A989716085740" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common Stock</link:label>
    <link:label id="lab_us-gaap_CommonStockMember_3752478553E17FCB872A989716085740_label_en-US" xlink:label="lab_us-gaap_CommonStockMember_3752478553E17FCB872A989716085740" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_3752478553E17FCB872A989716085740" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockMember_3752478553E17FCB872A989716085740" xlink:to="lab_us-gaap_CommonStockMember_3752478553E17FCB872A989716085740" xlink:type="arc" />
    <link:label id="lab_us-gaap_TreasuryStockMember_67F823463F584B459F6F98971608D371_terseLabel_en-US" xlink:label="lab_us-gaap_TreasuryStockMember_67F823463F584B459F6F98971608D371" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Treasury Stock</link:label>
    <link:label id="lab_us-gaap_TreasuryStockMember_67F823463F584B459F6F98971608D371_label_en-US" xlink:label="lab_us-gaap_TreasuryStockMember_67F823463F584B459F6F98971608D371" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Treasury Stock [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TreasuryStockMember" xlink:label="loc_us-gaap_TreasuryStockMember_67F823463F584B459F6F98971608D371" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TreasuryStockMember_67F823463F584B459F6F98971608D371" xlink:to="lab_us-gaap_TreasuryStockMember_67F823463F584B459F6F98971608D371" xlink:type="arc" />
    <link:label id="lab_us-gaap_AdditionalPaidInCapitalMember_2EDB19CD7738B3F38D47989716080E4D_terseLabel_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalMember_2EDB19CD7738B3F38D47989716080E4D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Additional Paid-in Capital</link:label>
    <link:label id="lab_us-gaap_AdditionalPaidInCapitalMember_2EDB19CD7738B3F38D47989716080E4D_label_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalMember_2EDB19CD7738B3F38D47989716080E4D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Additional Paid-in Capital [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_2EDB19CD7738B3F38D47989716080E4D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdditionalPaidInCapitalMember_2EDB19CD7738B3F38D47989716080E4D" xlink:to="lab_us-gaap_AdditionalPaidInCapitalMember_2EDB19CD7738B3F38D47989716080E4D" xlink:type="arc" />
    <link:label id="lab_us-gaap_RetainedEarningsMember_49125089E98927FF394D989716084134_terseLabel_en-US" xlink:label="lab_us-gaap_RetainedEarningsMember_49125089E98927FF394D989716084134" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Retained Earnings</link:label>
    <link:label id="lab_us-gaap_RetainedEarningsMember_49125089E98927FF394D989716084134_label_en-US" xlink:label="lab_us-gaap_RetainedEarningsMember_49125089E98927FF394D989716084134" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Retained Earnings [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_49125089E98927FF394D989716084134" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RetainedEarningsMember_49125089E98927FF394D989716084134" xlink:to="lab_us-gaap_RetainedEarningsMember_49125089E98927FF394D989716084134" xlink:type="arc" />
    <link:label id="lab_us-gaap_NoncontrollingInterestMember_90F095C814CDD4DE35C798971609BE82_terseLabel_en-US" xlink:label="lab_us-gaap_NoncontrollingInterestMember_90F095C814CDD4DE35C798971609BE82" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-controlling Interests</link:label>
    <link:label id="lab_us-gaap_NoncontrollingInterestMember_90F095C814CDD4DE35C798971609BE82_label_en-US" xlink:label="lab_us-gaap_NoncontrollingInterestMember_90F095C814CDD4DE35C798971609BE82" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Noncontrolling Interest [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NoncontrollingInterestMember" xlink:label="loc_us-gaap_NoncontrollingInterestMember_90F095C814CDD4DE35C798971609BE82" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NoncontrollingInterestMember_90F095C814CDD4DE35C798971609BE82" xlink:to="lab_us-gaap_NoncontrollingInterestMember_90F095C814CDD4DE35C798971609BE82" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_B585931FCF7FD46E48FC98971609EA83_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_B585931FCF7FD46E48FC98971609EA83" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Stockholders' Equity [Roll Forward]</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_B585931FCF7FD46E48FC98971609EA83_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_B585931FCF7FD46E48FC98971609EA83" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Stockholders' Equity [Roll Forward]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_B585931FCF7FD46E48FC98971609EA83" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_B585931FCF7FD46E48FC98971609EA83" xlink:to="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_B585931FCF7FD46E48FC98971609EA83" xlink:type="arc" />
    <link:label id="lab_us-gaap_SharesOutstanding_0E83DBD8F043C309973398971609938A_periodStartLabel_en-US" xlink:label="lab_us-gaap_SharesOutstanding_0E83DBD8F043C309973398971609938A" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Balance (shares)</link:label>
    <link:label id="lab_us-gaap_SharesOutstanding_0E83DBD8F043C309973398971609938A_label_en-US" xlink:label="lab_us-gaap_SharesOutstanding_0E83DBD8F043C309973398971609938A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Shares, Outstanding</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SharesOutstanding" xlink:label="loc_us-gaap_SharesOutstanding_0E83DBD8F043C309973398971609938A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharesOutstanding_0E83DBD8F043C309973398971609938A" xlink:to="lab_us-gaap_SharesOutstanding_0E83DBD8F043C309973398971609938A" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_B23F2021986AF0BA71AD9897160A5266_periodStartLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_B23F2021986AF0BA71AD9897160A5266" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Balance</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_B23F2021986AF0BA71AD9897160A5266" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_B23F2021986AF0BA71AD9897160A5266" xlink:to="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_B23F2021986AF0BA71AD9897160A5266" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_233DB67C8A2C59F9833C9897160A3688_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_233DB67C8A2C59F9833C9897160A3688" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Issuance of common stock due to acquisition (shares)</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_233DB67C8A2C59F9833C9897160A3688_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_233DB67C8A2C59F9833C9897160A3688" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period, Shares, Acquisitions</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_233DB67C8A2C59F9833C9897160A3688" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_233DB67C8A2C59F9833C9897160A3688" xlink:to="lab_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_233DB67C8A2C59F9833C9897160A3688" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueAcquisitions_298B661C7B299DE193C69897160A3018_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueAcquisitions_298B661C7B299DE193C69897160A3018" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Issuance of common stock due to acquisition</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueAcquisitions_298B661C7B299DE193C69897160A3018_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueAcquisitions_298B661C7B299DE193C69897160A3018" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period, Value, Acquisitions</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_298B661C7B299DE193C69897160A3018" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_298B661C7B299DE193C69897160A3018" xlink:to="lab_us-gaap_StockIssuedDuringPeriodValueAcquisitions_298B661C7B299DE193C69897160A3018" xlink:type="arc" />
    <link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_4CE47FD83CDB642E2D609897160A6DA6_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_4CE47FD83CDB642E2D609897160A6DA6" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Other (Oasis Midstream common units)</link:label>
    <link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_4CE47FD83CDB642E2D609897160A6DA6_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_4CE47FD83CDB642E2D609897160A6DA6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_4CE47FD83CDB642E2D609897160A6DA6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_4CE47FD83CDB642E2D609897160A6DA6" xlink:to="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_4CE47FD83CDB642E2D609897160A6DA6" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_75B6E352707603565C0F9897160AE3A3_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_75B6E352707603565C0F9897160AE3A3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity-based compensation (shares)</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_75B6E352707603565C0F9897160AE3A3_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_75B6E352707603565C0F9897160AE3A3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_75B6E352707603565C0F9897160AE3A3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_75B6E352707603565C0F9897160AE3A3" xlink:to="lab_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_75B6E352707603565C0F9897160AE3A3" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_BC79E6558DB35902EE589897160AD00B_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_BC79E6558DB35902EE589897160AD00B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity-based compensation</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_BC79E6558DB35902EE589897160AD00B_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_BC79E6558DB35902EE589897160AD00B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_BC79E6558DB35902EE589897160AD00B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_BC79E6558DB35902EE589897160AD00B" xlink:to="lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_BC79E6558DB35902EE589897160AD00B" xlink:type="arc" />
    <link:label id="lab_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_2B905D808C572B5BF5BA9897160B06B9_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_2B905D808C572B5BF5BA9897160B06B9" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Distributions to non-controlling interest owners</link:label>
    <link:label id="lab_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_2B905D808C572B5BF5BA9897160B06B9_label_en-US" xlink:label="lab_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_2B905D808C572B5BF5BA9897160B06B9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_2B905D808C572B5BF5BA9897160B06B9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_2B905D808C572B5BF5BA9897160B06B9" xlink:to="lab_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_2B905D808C572B5BF5BA9897160B06B9" xlink:type="arc" />
    <link:label id="lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_A6AB8D37A29968B332A99897160B5772_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_A6AB8D37A29968B332A99897160B5772" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Treasury stock - tax withholdings (shares)</link:label>
    <link:label id="lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_A6AB8D37A29968B332A99897160B5772_label_en-US" xlink:label="lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_A6AB8D37A29968B332A99897160B5772" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Shares Paid for Tax Withholding for Share Based Compensation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_A6AB8D37A29968B332A99897160B5772" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_A6AB8D37A29968B332A99897160B5772" xlink:to="lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_A6AB8D37A29968B332A99897160B5772" xlink:type="arc" />
    <link:label id="lab_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_15D6EAEDAE6F089DDED59897160B9B5E_negatedLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_15D6EAEDAE6F089DDED59897160B9B5E" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Treasury stock - tax withholdings</link:label>
    <link:label id="lab_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_15D6EAEDAE6F089DDED59897160B9B5E_label_en-US" xlink:label="lab_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_15D6EAEDAE6F089DDED59897160B9B5E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments Related to Tax Withholding for Share-based Compensation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_15D6EAEDAE6F089DDED59897160B9B5E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_15D6EAEDAE6F089DDED59897160B9B5E" xlink:to="lab_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_15D6EAEDAE6F089DDED59897160B9B5E" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProfitLoss_42AEE4ECCDE713136B469897160BA87D_verboseLabel_en-US" xlink:label="lab_us-gaap_ProfitLoss_42AEE4ECCDE713136B469897160BA87D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Net income (loss)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_42AEE4ECCDE713136B469897160BA87D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProfitLoss_42AEE4ECCDE713136B469897160BA87D" xlink:to="lab_us-gaap_ProfitLoss_42AEE4ECCDE713136B469897160BA87D" xlink:type="arc" />
    <link:label id="lab_us-gaap_SharesOutstanding_ED46B01561C3962FC3F69897160B97D1_periodEndLabel_en-US" xlink:label="lab_us-gaap_SharesOutstanding_ED46B01561C3962FC3F69897160B97D1" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Balance (shares)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SharesOutstanding" xlink:label="loc_us-gaap_SharesOutstanding_ED46B01561C3962FC3F69897160B97D1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharesOutstanding_ED46B01561C3962FC3F69897160B97D1" xlink:to="lab_us-gaap_SharesOutstanding_ED46B01561C3962FC3F69897160B97D1" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_8CED8F2D5513D582390C9897160C44DE_periodEndLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_8CED8F2D5513D582390C9897160C44DE" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Balance</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_8CED8F2D5513D582390C9897160C44DE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_8CED8F2D5513D582390C9897160C44DE" xlink:to="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_8CED8F2D5513D582390C9897160C44DE" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeTable_AA9CCD14EC9333BCFC5F935F504F78C2_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeTable_AA9CCD14EC9333BCFC5F935F504F78C2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative [Table]</link:label>
    <link:label id="lab_us-gaap_DerivativeTable_AA9CCD14EC9333BCFC5F935F504F78C2_label_en-US" xlink:label="lab_us-gaap_DerivativeTable_AA9CCD14EC9333BCFC5F935F504F78C2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeTable" xlink:label="loc_us-gaap_DerivativeTable_AA9CCD14EC9333BCFC5F935F504F78C2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeTable_AA9CCD14EC9333BCFC5F935F504F78C2" xlink:to="lab_us-gaap_DerivativeTable_AA9CCD14EC9333BCFC5F935F504F78C2" xlink:type="arc" />
    <link:label id="lab_dei_EntityListingsExchangeAxis_35CFA42C3F7F8A8580F3935F504F6F3D_terseLabel_en-US" xlink:label="lab_dei_EntityListingsExchangeAxis_35CFA42C3F7F8A8580F3935F504F6F3D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Listings, Exchange [Axis]</link:label>
    <link:label id="lab_dei_EntityListingsExchangeAxis_35CFA42C3F7F8A8580F3935F504F6F3D_label_en-US" xlink:label="lab_dei_EntityListingsExchangeAxis_35CFA42C3F7F8A8580F3935F504F6F3D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Listings, Exchange [Axis]</link:label>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_EntityListingsExchangeAxis" xlink:label="loc_dei_EntityListingsExchangeAxis_35CFA42C3F7F8A8580F3935F504F6F3D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityListingsExchangeAxis_35CFA42C3F7F8A8580F3935F504F6F3D" xlink:to="lab_dei_EntityListingsExchangeAxis_35CFA42C3F7F8A8580F3935F504F6F3D" xlink:type="arc" />
    <link:label id="lab_exch_AllExchangesDomain_1279EF463280901E1FE8935F505094C9_terseLabel_en-US" xlink:label="lab_exch_AllExchangesDomain_1279EF463280901E1FE8935F505094C9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">All Exchanges [Domain]</link:label>
    <link:label id="lab_exch_AllExchangesDomain_1279EF463280901E1FE8935F505094C9_label_en-US" xlink:label="lab_exch_AllExchangesDomain_1279EF463280901E1FE8935F505094C9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">All Exchanges [Domain]</link:label>
    <link:loc xlink:href="https://xbrl.sec.gov/exch/2018/exch-2018-01-31.xsd#exch_AllExchangesDomain" xlink:label="loc_exch_AllExchangesDomain_1279EF463280901E1FE8935F505094C9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_exch_AllExchangesDomain_1279EF463280901E1FE8935F505094C9" xlink:to="lab_exch_AllExchangesDomain_1279EF463280901E1FE8935F505094C9" xlink:type="arc" />
    <link:label id="lab_oas_NYMEXWTIMember_3749069AD23029995DB0935F5051077A_terseLabel_en-US" xlink:label="lab_oas_NYMEXWTIMember_3749069AD23029995DB0935F5051077A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">NYMEX WTI</link:label>
    <link:label id="lab_oas_NYMEXWTIMember_3749069AD23029995DB0935F5051077A_label_en-US" xlink:label="lab_oas_NYMEXWTIMember_3749069AD23029995DB0935F5051077A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">NYMEX WTI [Member]</link:label>
    <link:label id="lab_oas_NYMEXWTIMember_3749069AD23029995DB0935F5051077A_documentation_en-US" xlink:label="lab_oas_NYMEXWTIMember_3749069AD23029995DB0935F5051077A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">NYMEX WTI [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_NYMEXWTIMember" xlink:label="loc_oas_NYMEXWTIMember_3749069AD23029995DB0935F5051077A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_NYMEXWTIMember_3749069AD23029995DB0935F5051077A" xlink:to="lab_oas_NYMEXWTIMember_3749069AD23029995DB0935F5051077A" xlink:type="arc" />
    <link:label id="lab_oas_NYMEXWTIICEBRENTMember_0E5B27E55F5AE10A4E4A935F505165D2_terseLabel_en-US" xlink:label="lab_oas_NYMEXWTIICEBRENTMember_0E5B27E55F5AE10A4E4A935F505165D2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ICE Brent-NYMEX WTI</link:label>
    <link:label id="lab_oas_NYMEXWTIICEBRENTMember_0E5B27E55F5AE10A4E4A935F505165D2_label_en-US" xlink:label="lab_oas_NYMEXWTIICEBRENTMember_0E5B27E55F5AE10A4E4A935F505165D2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">NYMEX WTI-ICE BRENT [Member]</link:label>
    <link:label id="lab_oas_NYMEXWTIICEBRENTMember_0E5B27E55F5AE10A4E4A935F505165D2_documentation_en-US" xlink:label="lab_oas_NYMEXWTIICEBRENTMember_0E5B27E55F5AE10A4E4A935F505165D2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">NYMEX WTI-ICE BRENT [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_NYMEXWTIICEBRENTMember" xlink:label="loc_oas_NYMEXWTIICEBRENTMember_0E5B27E55F5AE10A4E4A935F505165D2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_NYMEXWTIICEBRENTMember_0E5B27E55F5AE10A4E4A935F505165D2" xlink:to="lab_oas_NYMEXWTIICEBRENTMember_0E5B27E55F5AE10A4E4A935F505165D2" xlink:type="arc" />
    <link:label id="lab_oas_MidlandNYMEXWTIMember_F68AF805A3FA70A3E700935F5051A352_terseLabel_en-US" xlink:label="lab_oas_MidlandNYMEXWTIMember_F68AF805A3FA70A3E700935F5051A352" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Midland-NYMEX WTI</link:label>
    <link:label id="lab_oas_MidlandNYMEXWTIMember_F68AF805A3FA70A3E700935F5051A352_label_en-US" xlink:label="lab_oas_MidlandNYMEXWTIMember_F68AF805A3FA70A3E700935F5051A352" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Midland-NYMEX WTI [Member]</link:label>
    <link:label id="lab_oas_MidlandNYMEXWTIMember_F68AF805A3FA70A3E700935F5051A352_documentation_en-US" xlink:label="lab_oas_MidlandNYMEXWTIMember_F68AF805A3FA70A3E700935F5051A352" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Midland-NYMEX WTI [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_MidlandNYMEXWTIMember" xlink:label="loc_oas_MidlandNYMEXWTIMember_F68AF805A3FA70A3E700935F5051A352" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_MidlandNYMEXWTIMember_F68AF805A3FA70A3E700935F5051A352" xlink:to="lab_oas_MidlandNYMEXWTIMember_F68AF805A3FA70A3E700935F5051A352" xlink:type="arc" />
    <link:label id="lab_oas_HoustonNYMEXWTIMember_ECB4204F8BAC77010AD3935F50520A03_terseLabel_en-US" xlink:label="lab_oas_HoustonNYMEXWTIMember_ECB4204F8BAC77010AD3935F50520A03" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Houston NYMEX WTI</link:label>
    <link:label id="lab_oas_HoustonNYMEXWTIMember_ECB4204F8BAC77010AD3935F50520A03_label_en-US" xlink:label="lab_oas_HoustonNYMEXWTIMember_ECB4204F8BAC77010AD3935F50520A03" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Houston NYMEX WTI [Member]</link:label>
    <link:label id="lab_oas_HoustonNYMEXWTIMember_ECB4204F8BAC77010AD3935F50520A03_documentation_en-US" xlink:label="lab_oas_HoustonNYMEXWTIMember_ECB4204F8BAC77010AD3935F50520A03" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Houston NYMEX WTI [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_HoustonNYMEXWTIMember" xlink:label="loc_oas_HoustonNYMEXWTIMember_ECB4204F8BAC77010AD3935F50520A03" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_HoustonNYMEXWTIMember_ECB4204F8BAC77010AD3935F50520A03" xlink:to="lab_oas_HoustonNYMEXWTIMember_ECB4204F8BAC77010AD3935F50520A03" xlink:type="arc" />
    <link:label id="lab_oas_NYMEXHHMember_7B5B369C45C4A4D06009935F5052F3AA_terseLabel_en-US" xlink:label="lab_oas_NYMEXHHMember_7B5B369C45C4A4D06009935F5052F3AA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">NYMEX HH</link:label>
    <link:label id="lab_oas_NYMEXHHMember_7B5B369C45C4A4D06009935F5052F3AA_label_en-US" xlink:label="lab_oas_NYMEXHHMember_7B5B369C45C4A4D06009935F5052F3AA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">NYMEX HH [Member]</link:label>
    <link:label id="lab_oas_NYMEXHHMember_7B5B369C45C4A4D06009935F5052F3AA_documentation_en-US" xlink:label="lab_oas_NYMEXHHMember_7B5B369C45C4A4D06009935F5052F3AA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">NYMEX HH [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_NYMEXHHMember" xlink:label="loc_oas_NYMEXHHMember_7B5B369C45C4A4D06009935F5052F3AA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_NYMEXHHMember_7B5B369C45C4A4D06009935F5052F3AA" xlink:to="lab_oas_NYMEXHHMember_7B5B369C45C4A4D06009935F5052F3AA" xlink:type="arc" />
    <link:label id="lab_oas_IFNNGVENTURANYMEXMember_599A2D9AA726F4943602935F5052CE7B_terseLabel_en-US" xlink:label="lab_oas_IFNNGVENTURANYMEXMember_599A2D9AA726F4943602935F5052CE7B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">IF NNG Ventura-NYMEX HH</link:label>
    <link:label id="lab_oas_IFNNGVENTURANYMEXMember_599A2D9AA726F4943602935F5052CE7B_label_en-US" xlink:label="lab_oas_IFNNGVENTURANYMEXMember_599A2D9AA726F4943602935F5052CE7B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">IF NNG VENTURA-NYMEX [Member]</link:label>
    <link:label id="lab_oas_IFNNGVENTURANYMEXMember_599A2D9AA726F4943602935F5052CE7B_documentation_en-US" xlink:label="lab_oas_IFNNGVENTURANYMEXMember_599A2D9AA726F4943602935F5052CE7B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">IF NNG VENTURA-NYMEX [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_IFNNGVENTURANYMEXMember" xlink:label="loc_oas_IFNNGVENTURANYMEXMember_599A2D9AA726F4943602935F5052CE7B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_IFNNGVENTURANYMEXMember_599A2D9AA726F4943602935F5052CE7B" xlink:to="lab_oas_IFNNGVENTURANYMEXMember_599A2D9AA726F4943602935F5052CE7B" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeInstrumentRiskAxis_84AE12B0E70A2239FE8C935F50544588_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentRiskAxis_84AE12B0E70A2239FE8C935F50544588" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative Instrument [Axis]</link:label>
    <link:label id="lab_us-gaap_DerivativeInstrumentRiskAxis_84AE12B0E70A2239FE8C935F50544588_label_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentRiskAxis_84AE12B0E70A2239FE8C935F50544588" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Instrument [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_84AE12B0E70A2239FE8C935F50544588" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_84AE12B0E70A2239FE8C935F50544588" xlink:to="lab_us-gaap_DerivativeInstrumentRiskAxis_84AE12B0E70A2239FE8C935F50544588" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeContractTypeDomain_34D71E550A3269F27C4F935F50553365_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeContractTypeDomain_34D71E550A3269F27C4F935F50553365" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative Contract [Domain]</link:label>
    <link:label id="lab_us-gaap_DerivativeContractTypeDomain_34D71E550A3269F27C4F935F50553365_label_en-US" xlink:label="lab_us-gaap_DerivativeContractTypeDomain_34D71E550A3269F27C4F935F50553365" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Contract [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_34D71E550A3269F27C4F935F50553365" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_34D71E550A3269F27C4F935F50553365" xlink:to="lab_us-gaap_DerivativeContractTypeDomain_34D71E550A3269F27C4F935F50553365" xlink:type="arc" />
    <link:label id="lab_oas_TwoThousandNineteenSwapsMember_A60B7116EDAC4B1EA449935F50558ECC_terseLabel_en-US" xlink:label="lab_oas_TwoThousandNineteenSwapsMember_A60B7116EDAC4B1EA449935F50558ECC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019 Fixed price swaps</link:label>
    <link:label id="lab_oas_TwoThousandNineteenSwapsMember_A60B7116EDAC4B1EA449935F50558ECC_label_en-US" xlink:label="lab_oas_TwoThousandNineteenSwapsMember_A60B7116EDAC4B1EA449935F50558ECC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Thousand Nineteen Swaps [Member]</link:label>
    <link:label id="lab_oas_TwoThousandNineteenSwapsMember_A60B7116EDAC4B1EA449935F50558ECC_documentation_en-US" xlink:label="lab_oas_TwoThousandNineteenSwapsMember_A60B7116EDAC4B1EA449935F50558ECC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Thousand Nineteen Swaps [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_TwoThousandNineteenSwapsMember" xlink:label="loc_oas_TwoThousandNineteenSwapsMember_A60B7116EDAC4B1EA449935F50558ECC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_TwoThousandNineteenSwapsMember_A60B7116EDAC4B1EA449935F50558ECC" xlink:to="lab_oas_TwoThousandNineteenSwapsMember_A60B7116EDAC4B1EA449935F50558ECC" xlink:type="arc" />
    <link:label id="lab_oas_TwoThousandNineteenBasisSwapsMember_B262E99CEF1FD0C0B0EF935F5055662F_terseLabel_en-US" xlink:label="lab_oas_TwoThousandNineteenBasisSwapsMember_B262E99CEF1FD0C0B0EF935F5055662F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019 Basis swaps</link:label>
    <link:label id="lab_oas_TwoThousandNineteenBasisSwapsMember_B262E99CEF1FD0C0B0EF935F5055662F_label_en-US" xlink:label="lab_oas_TwoThousandNineteenBasisSwapsMember_B262E99CEF1FD0C0B0EF935F5055662F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Thousand Nineteen Basis Swaps [Member]</link:label>
    <link:label id="lab_oas_TwoThousandNineteenBasisSwapsMember_B262E99CEF1FD0C0B0EF935F5055662F_documentation_en-US" xlink:label="lab_oas_TwoThousandNineteenBasisSwapsMember_B262E99CEF1FD0C0B0EF935F5055662F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Thousand Nineteen Basis Swaps [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_TwoThousandNineteenBasisSwapsMember" xlink:label="loc_oas_TwoThousandNineteenBasisSwapsMember_B262E99CEF1FD0C0B0EF935F5055662F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_TwoThousandNineteenBasisSwapsMember_B262E99CEF1FD0C0B0EF935F5055662F" xlink:to="lab_oas_TwoThousandNineteenBasisSwapsMember_B262E99CEF1FD0C0B0EF935F5055662F" xlink:type="arc" />
    <link:label id="lab_oas_TwoThousandNineteenTwowayCollarsMember_9FE1DCE5955743D60D0D935F5055C9E7_terseLabel_en-US" xlink:label="lab_oas_TwoThousandNineteenTwowayCollarsMember_9FE1DCE5955743D60D0D935F5055C9E7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019 Two-way collar</link:label>
    <link:label id="lab_oas_TwoThousandNineteenTwowayCollarsMember_9FE1DCE5955743D60D0D935F5055C9E7_label_en-US" xlink:label="lab_oas_TwoThousandNineteenTwowayCollarsMember_9FE1DCE5955743D60D0D935F5055C9E7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Thousand Nineteen Two-way Collars [Member]</link:label>
    <link:label id="lab_oas_TwoThousandNineteenTwowayCollarsMember_9FE1DCE5955743D60D0D935F5055C9E7_documentation_en-US" xlink:label="lab_oas_TwoThousandNineteenTwowayCollarsMember_9FE1DCE5955743D60D0D935F5055C9E7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Thousand Nineteen Two-way Collars [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_TwoThousandNineteenTwowayCollarsMember" xlink:label="loc_oas_TwoThousandNineteenTwowayCollarsMember_9FE1DCE5955743D60D0D935F5055C9E7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_TwoThousandNineteenTwowayCollarsMember_9FE1DCE5955743D60D0D935F5055C9E7" xlink:to="lab_oas_TwoThousandNineteenTwowayCollarsMember_9FE1DCE5955743D60D0D935F5055C9E7" xlink:type="arc" />
    <link:label id="lab_oas_TwoThousandNineteenThreeWayCollarsMember_F3BF5C31D7A265322BB4935F50568099_terseLabel_en-US" xlink:label="lab_oas_TwoThousandNineteenThreeWayCollarsMember_F3BF5C31D7A265322BB4935F50568099" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019 Three-way collar</link:label>
    <link:label id="lab_oas_TwoThousandNineteenThreeWayCollarsMember_F3BF5C31D7A265322BB4935F50568099_label_en-US" xlink:label="lab_oas_TwoThousandNineteenThreeWayCollarsMember_F3BF5C31D7A265322BB4935F50568099" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Thousand Nineteen Three Way Collars [Member]</link:label>
    <link:label id="lab_oas_TwoThousandNineteenThreeWayCollarsMember_F3BF5C31D7A265322BB4935F50568099_documentation_en-US" xlink:label="lab_oas_TwoThousandNineteenThreeWayCollarsMember_F3BF5C31D7A265322BB4935F50568099" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Thousand Nineteen Three Way Collars [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_TwoThousandNineteenThreeWayCollarsMember" xlink:label="loc_oas_TwoThousandNineteenThreeWayCollarsMember_F3BF5C31D7A265322BB4935F50568099" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_TwoThousandNineteenThreeWayCollarsMember_F3BF5C31D7A265322BB4935F50568099" xlink:to="lab_oas_TwoThousandNineteenThreeWayCollarsMember_F3BF5C31D7A265322BB4935F50568099" xlink:type="arc" />
    <link:label id="lab_oas_TwoThousandTwentySwapMember_068959AEA17B9151C4EE935F50568E4E_terseLabel_en-US" xlink:label="lab_oas_TwoThousandTwentySwapMember_068959AEA17B9151C4EE935F50568E4E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020 Fixed price swaps</link:label>
    <link:label id="lab_oas_TwoThousandTwentySwapMember_068959AEA17B9151C4EE935F50568E4E_label_en-US" xlink:label="lab_oas_TwoThousandTwentySwapMember_068959AEA17B9151C4EE935F50568E4E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Thousand Twenty Swap [Member]</link:label>
    <link:label id="lab_oas_TwoThousandTwentySwapMember_068959AEA17B9151C4EE935F50568E4E_documentation_en-US" xlink:label="lab_oas_TwoThousandTwentySwapMember_068959AEA17B9151C4EE935F50568E4E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Thousand Twenty Swap [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_TwoThousandTwentySwapMember" xlink:label="loc_oas_TwoThousandTwentySwapMember_068959AEA17B9151C4EE935F50568E4E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_TwoThousandTwentySwapMember_068959AEA17B9151C4EE935F50568E4E" xlink:to="lab_oas_TwoThousandTwentySwapMember_068959AEA17B9151C4EE935F50568E4E" xlink:type="arc" />
    <link:label id="lab_oas_TwoThousandTwentyTwoWayCollarsMember_C1C791A19AFB6F637294935F50563680_terseLabel_en-US" xlink:label="lab_oas_TwoThousandTwentyTwoWayCollarsMember_C1C791A19AFB6F637294935F50563680" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020 Two-way collar</link:label>
    <link:label id="lab_oas_TwoThousandTwentyTwoWayCollarsMember_C1C791A19AFB6F637294935F50563680_label_en-US" xlink:label="lab_oas_TwoThousandTwentyTwoWayCollarsMember_C1C791A19AFB6F637294935F50563680" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Thousand Twenty Two Way Collars [Member]</link:label>
    <link:label id="lab_oas_TwoThousandTwentyTwoWayCollarsMember_C1C791A19AFB6F637294935F50563680_documentation_en-US" xlink:label="lab_oas_TwoThousandTwentyTwoWayCollarsMember_C1C791A19AFB6F637294935F50563680" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Thousand Twenty Two Way Collars [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_TwoThousandTwentyTwoWayCollarsMember" xlink:label="loc_oas_TwoThousandTwentyTwoWayCollarsMember_C1C791A19AFB6F637294935F50563680" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_TwoThousandTwentyTwoWayCollarsMember_C1C791A19AFB6F637294935F50563680" xlink:to="lab_oas_TwoThousandTwentyTwoWayCollarsMember_C1C791A19AFB6F637294935F50563680" xlink:type="arc" />
    <link:label id="lab_oas_TwoThousandTwentyThreeWayCollarsMember_9B0F10469A7939C81626935F5056D0AA_terseLabel_en-US" xlink:label="lab_oas_TwoThousandTwentyThreeWayCollarsMember_9B0F10469A7939C81626935F5056D0AA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020 Three-way collar</link:label>
    <link:label id="lab_oas_TwoThousandTwentyThreeWayCollarsMember_9B0F10469A7939C81626935F5056D0AA_label_en-US" xlink:label="lab_oas_TwoThousandTwentyThreeWayCollarsMember_9B0F10469A7939C81626935F5056D0AA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Thousand Twenty Three Way Collars [Member]</link:label>
    <link:label id="lab_oas_TwoThousandTwentyThreeWayCollarsMember_9B0F10469A7939C81626935F5056D0AA_documentation_en-US" xlink:label="lab_oas_TwoThousandTwentyThreeWayCollarsMember_9B0F10469A7939C81626935F5056D0AA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Thousand Twenty Three Way Collars [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_TwoThousandTwentyThreeWayCollarsMember" xlink:label="loc_oas_TwoThousandTwentyThreeWayCollarsMember_9B0F10469A7939C81626935F5056D0AA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_TwoThousandTwentyThreeWayCollarsMember_9B0F10469A7939C81626935F5056D0AA" xlink:to="lab_oas_TwoThousandTwentyThreeWayCollarsMember_9B0F10469A7939C81626935F5056D0AA" xlink:type="arc" />
    <link:label id="lab_oas_TwoThousandTwentyOneFixedPriceSwapMember_DD6298ED6D8C09AC1C8B935F5057D12A_terseLabel_en-US" xlink:label="lab_oas_TwoThousandTwentyOneFixedPriceSwapMember_DD6298ED6D8C09AC1C8B935F5057D12A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021 Fixed price swaps</link:label>
    <link:label id="lab_oas_TwoThousandTwentyOneFixedPriceSwapMember_DD6298ED6D8C09AC1C8B935F5057D12A_label_en-US" xlink:label="lab_oas_TwoThousandTwentyOneFixedPriceSwapMember_DD6298ED6D8C09AC1C8B935F5057D12A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Thousand Twenty One Fixed Price Swap [Member]</link:label>
    <link:label id="lab_oas_TwoThousandTwentyOneFixedPriceSwapMember_DD6298ED6D8C09AC1C8B935F5057D12A_documentation_en-US" xlink:label="lab_oas_TwoThousandTwentyOneFixedPriceSwapMember_DD6298ED6D8C09AC1C8B935F5057D12A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Thousand Twenty One Fixed Price Swap [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_TwoThousandTwentyOneFixedPriceSwapMember" xlink:label="loc_oas_TwoThousandTwentyOneFixedPriceSwapMember_DD6298ED6D8C09AC1C8B935F5057D12A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_TwoThousandTwentyOneFixedPriceSwapMember_DD6298ED6D8C09AC1C8B935F5057D12A" xlink:to="lab_oas_TwoThousandTwentyOneFixedPriceSwapMember_DD6298ED6D8C09AC1C8B935F5057D12A" xlink:type="arc" />
    <link:label id="lab_oas_TwoThousandTwentyOneThreeWayCollarsMember_A119572DAEF3F19BDCB9935F5057E4EF_terseLabel_en-US" xlink:label="lab_oas_TwoThousandTwentyOneThreeWayCollarsMember_A119572DAEF3F19BDCB9935F5057E4EF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021 Three-way collar</link:label>
    <link:label id="lab_oas_TwoThousandTwentyOneThreeWayCollarsMember_A119572DAEF3F19BDCB9935F5057E4EF_label_en-US" xlink:label="lab_oas_TwoThousandTwentyOneThreeWayCollarsMember_A119572DAEF3F19BDCB9935F5057E4EF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Thousand Twenty One Three Way Collars [Member]</link:label>
    <link:label id="lab_oas_TwoThousandTwentyOneThreeWayCollarsMember_A119572DAEF3F19BDCB9935F5057E4EF_documentation_en-US" xlink:label="lab_oas_TwoThousandTwentyOneThreeWayCollarsMember_A119572DAEF3F19BDCB9935F5057E4EF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Thousand Twenty One Three Way Collars [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_TwoThousandTwentyOneThreeWayCollarsMember" xlink:label="loc_oas_TwoThousandTwentyOneThreeWayCollarsMember_A119572DAEF3F19BDCB9935F5057E4EF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_TwoThousandTwentyOneThreeWayCollarsMember_A119572DAEF3F19BDCB9935F5057E4EF" xlink:to="lab_oas_TwoThousandTwentyOneThreeWayCollarsMember_A119572DAEF3F19BDCB9935F5057E4EF" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeLineItems_7A7C2349CD8EEFF95576935F50573F29_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeLineItems_7A7C2349CD8EEFF95576935F50573F29" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative [Line Items]</link:label>
    <link:label id="lab_us-gaap_DerivativeLineItems_7A7C2349CD8EEFF95576935F50573F29_label_en-US" xlink:label="lab_us-gaap_DerivativeLineItems_7A7C2349CD8EEFF95576935F50573F29" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeLineItems" xlink:label="loc_us-gaap_DerivativeLineItems_7A7C2349CD8EEFF95576935F50573F29" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLineItems_7A7C2349CD8EEFF95576935F50573F29" xlink:to="lab_us-gaap_DerivativeLineItems_7A7C2349CD8EEFF95576935F50573F29" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeNonmonetaryNotionalAmountVolume_8F649C4AF43485C55C5A935F505C7320_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeNonmonetaryNotionalAmountVolume_8F649C4AF43485C55C5A935F505C7320" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total notional amount of oil (in Bbls)</link:label>
    <link:label id="lab_us-gaap_DerivativeNonmonetaryNotionalAmountVolume_8F649C4AF43485C55C5A935F505C7320_label_en-US" xlink:label="lab_us-gaap_DerivativeNonmonetaryNotionalAmountVolume_8F649C4AF43485C55C5A935F505C7320" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative, Nonmonetary Notional Amount, Volume</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeNonmonetaryNotionalAmountVolume" xlink:label="loc_us-gaap_DerivativeNonmonetaryNotionalAmountVolume_8F649C4AF43485C55C5A935F505C7320" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeNonmonetaryNotionalAmountVolume_8F649C4AF43485C55C5A935F505C7320" xlink:to="lab_us-gaap_DerivativeNonmonetaryNotionalAmountVolume_8F649C4AF43485C55C5A935F505C7320" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure_669601EB3C95D8E44D46935F505D3EE1_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure_669601EB3C95D8E44D46935F505D3EE1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total notional amount of natural gas (in MMBtu)</link:label>
    <link:label id="lab_us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure_669601EB3C95D8E44D46935F505D3EE1_label_en-US" xlink:label="lab_us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure_669601EB3C95D8E44D46935F505D3EE1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative, Nonmonetary Notional Amount, Energy Measure</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure" xlink:label="loc_us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure_669601EB3C95D8E44D46935F505D3EE1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure_669601EB3C95D8E44D46935F505D3EE1" xlink:to="lab_us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure_669601EB3C95D8E44D46935F505D3EE1" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeSwapTypeAverageFixedPrice_7718B53882F7E132AB9C935F505D752E_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeSwapTypeAverageFixedPrice_7718B53882F7E132AB9C935F505D752E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Average swap price (in dollars per barrel)</link:label>
    <link:label id="lab_us-gaap_DerivativeSwapTypeAverageFixedPrice_7718B53882F7E132AB9C935F505D752E_label_en-US" xlink:label="lab_us-gaap_DerivativeSwapTypeAverageFixedPrice_7718B53882F7E132AB9C935F505D752E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative, Swap Type, Average Fixed Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeSwapTypeAverageFixedPrice" xlink:label="loc_us-gaap_DerivativeSwapTypeAverageFixedPrice_7718B53882F7E132AB9C935F505D752E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeSwapTypeAverageFixedPrice_7718B53882F7E132AB9C935F505D752E" xlink:to="lab_us-gaap_DerivativeSwapTypeAverageFixedPrice_7718B53882F7E132AB9C935F505D752E" xlink:type="arc" />
    <link:label id="lab_oas_DerivativeSubFloorPrice_2B354CC04B3B711EEB13935F505DA7FE_terseLabel_en-US" xlink:label="lab_oas_DerivativeSubFloorPrice_2B354CC04B3B711EEB13935F505DA7FE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Average sub-floor price (in dollars per barrel)</link:label>
    <link:label id="lab_oas_DerivativeSubFloorPrice_2B354CC04B3B711EEB13935F505DA7FE_label_en-US" xlink:label="lab_oas_DerivativeSubFloorPrice_2B354CC04B3B711EEB13935F505DA7FE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative, Sub-Floor Price</link:label>
    <link:label id="lab_oas_DerivativeSubFloorPrice_2B354CC04B3B711EEB13935F505DA7FE_documentation_en-US" xlink:label="lab_oas_DerivativeSubFloorPrice_2B354CC04B3B711EEB13935F505DA7FE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative, Sub-Floor Price</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_DerivativeSubFloorPrice" xlink:label="loc_oas_DerivativeSubFloorPrice_2B354CC04B3B711EEB13935F505DA7FE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_DerivativeSubFloorPrice_2B354CC04B3B711EEB13935F505DA7FE" xlink:to="lab_oas_DerivativeSubFloorPrice_2B354CC04B3B711EEB13935F505DA7FE" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeAverageFloorPrice_96123D74D47343321951935F505D3F05_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeAverageFloorPrice_96123D74D47343321951935F505D3F05" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Average floor price (in dollars per barrel)</link:label>
    <link:label id="lab_us-gaap_DerivativeAverageFloorPrice_96123D74D47343321951935F505D3F05_label_en-US" xlink:label="lab_us-gaap_DerivativeAverageFloorPrice_96123D74D47343321951935F505D3F05" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative, Average Floor Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeAverageFloorPrice" xlink:label="loc_us-gaap_DerivativeAverageFloorPrice_96123D74D47343321951935F505D3F05" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeAverageFloorPrice_96123D74D47343321951935F505D3F05" xlink:to="lab_us-gaap_DerivativeAverageFloorPrice_96123D74D47343321951935F505D3F05" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeAverageCapPrice_4CF6031910AEF367BE69935F505DA70A_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeAverageCapPrice_4CF6031910AEF367BE69935F505DA70A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Average ceiling price (in dollars per barrel)</link:label>
    <link:label id="lab_us-gaap_DerivativeAverageCapPrice_4CF6031910AEF367BE69935F505DA70A_label_en-US" xlink:label="lab_us-gaap_DerivativeAverageCapPrice_4CF6031910AEF367BE69935F505DA70A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative, Average Cap Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeAverageCapPrice" xlink:label="loc_us-gaap_DerivativeAverageCapPrice_4CF6031910AEF367BE69935F505DA70A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeAverageCapPrice_4CF6031910AEF367BE69935F505DA70A" xlink:to="lab_us-gaap_DerivativeAverageCapPrice_4CF6031910AEF367BE69935F505DA70A" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeNet_4397CC1754E841754674935F505E5C03_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeNet_4397CC1754E841754674935F505E5C03" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair value assets (liabilities)</link:label>
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeNet_4397CC1754E841754674935F505E5C03_label_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeNet_4397CC1754E841754674935F505E5C03" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative, Fair Value, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeNet" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeNet_4397CC1754E841754674935F505E5C03" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeNet_4397CC1754E841754674935F505E5C03" xlink:to="lab_us-gaap_DerivativeFairValueOfDerivativeNet_4397CC1754E841754674935F505E5C03" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_1FE26C64CA12682D3269602EBF3ACE03_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_1FE26C64CA12682D3269602EBF3ACE03" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Property, Plant and Equipment</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_1FE26C64CA12682D3269602EBF3ACE03_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_1FE26C64CA12682D3269602EBF3ACE03" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTextBlock" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTextBlock_1FE26C64CA12682D3269602EBF3ACE03" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTextBlock_1FE26C64CA12682D3269602EBF3ACE03" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_1FE26C64CA12682D3269602EBF3ACE03" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_2D9B67912427455AABCF602EBF6A5DE1_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_2D9B67912427455AABCF602EBF6A5DE1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Hierarchy of Fair Value, Assets and Liabilities Measured on Recurring Basis</link:label>
    <link:label id="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_2D9B67912427455AABCF602EBF6A5DE1_label_en-US" xlink:label="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_2D9B67912427455AABCF602EBF6A5DE1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_2D9B67912427455AABCF602EBF6A5DE1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_2D9B67912427455AABCF602EBF6A5DE1" xlink:to="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_2D9B67912427455AABCF602EBF6A5DE1" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasePayments_56FD499BA03C8D23E9B08E86D4073BEE_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasePayments_56FD499BA03C8D23E9B08E86D4073BEE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating cash flows from operating leases</link:label>
    <link:label id="lab_us-gaap_OperatingLeasePayments_56FD499BA03C8D23E9B08E86D4073BEE_label_en-US" xlink:label="lab_us-gaap_OperatingLeasePayments_56FD499BA03C8D23E9B08E86D4073BEE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Payments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeasePayments" xlink:label="loc_us-gaap_OperatingLeasePayments_56FD499BA03C8D23E9B08E86D4073BEE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasePayments_56FD499BA03C8D23E9B08E86D4073BEE" xlink:to="lab_us-gaap_OperatingLeasePayments_56FD499BA03C8D23E9B08E86D4073BEE" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseInterestPaymentOnLiability_170E553F43A4A3D43B488E86D4070931_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseInterestPaymentOnLiability_170E553F43A4A3D43B488E86D4070931" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating cash flows from finance leases</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseInterestPaymentOnLiability_170E553F43A4A3D43B488E86D4070931_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseInterestPaymentOnLiability_170E553F43A4A3D43B488E86D4070931" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Interest Payment on Liability</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseInterestPaymentOnLiability" xlink:label="loc_us-gaap_FinanceLeaseInterestPaymentOnLiability_170E553F43A4A3D43B488E86D4070931" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseInterestPaymentOnLiability_170E553F43A4A3D43B488E86D4070931" xlink:to="lab_us-gaap_FinanceLeaseInterestPaymentOnLiability_170E553F43A4A3D43B488E86D4070931" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeasePrincipalPayments_3E1DE3AEB8ADD755A63E8E86D408D723_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeasePrincipalPayments_3E1DE3AEB8ADD755A63E8E86D408D723" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financing cash flows from finance leases</link:label>
    <link:label id="lab_us-gaap_FinanceLeasePrincipalPayments_3E1DE3AEB8ADD755A63E8E86D408D723_label_en-US" xlink:label="lab_us-gaap_FinanceLeasePrincipalPayments_3E1DE3AEB8ADD755A63E8E86D408D723" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Principal Payments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeasePrincipalPayments" xlink:label="loc_us-gaap_FinanceLeasePrincipalPayments_3E1DE3AEB8ADD755A63E8E86D408D723" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeasePrincipalPayments_3E1DE3AEB8ADD755A63E8E86D408D723" xlink:to="lab_us-gaap_FinanceLeasePrincipalPayments_3E1DE3AEB8ADD755A63E8E86D408D723" xlink:type="arc" />
    <link:label id="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_200A0E0D77AFDA791D858E86D4084A6A_terseLabel_en-US" xlink:label="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_200A0E0D77AFDA791D858E86D4084A6A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Right-of-use assets obtained in exchange for operating lease obligations</link:label>
    <link:label id="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_200A0E0D77AFDA791D858E86D4084A6A_label_en-US" xlink:label="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_200A0E0D77AFDA791D858E86D4084A6A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Right-of-Use Asset Obtained in Exchange for Operating Lease Liability</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_200A0E0D77AFDA791D858E86D4084A6A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_200A0E0D77AFDA791D858E86D4084A6A" xlink:to="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_200A0E0D77AFDA791D858E86D4084A6A" xlink:type="arc" />
    <link:label id="lab_us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability_8FD3CDA18F8FDC0756618E86D4083546_terseLabel_en-US" xlink:label="lab_us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability_8FD3CDA18F8FDC0756618E86D4083546" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Right-of-use assets obtained in exchange for finance lease obligations</link:label>
    <link:label id="lab_us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability_8FD3CDA18F8FDC0756618E86D4083546_label_en-US" xlink:label="lab_us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability_8FD3CDA18F8FDC0756618E86D4083546" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Right-of-Use Asset Obtained in Exchange for Finance Lease Liability</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability_8FD3CDA18F8FDC0756618E86D4083546" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability_8FD3CDA18F8FDC0756618E86D4083546" xlink:to="lab_us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability_8FD3CDA18F8FDC0756618E86D4083546" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommonStockParOrStatedValuePerShare_1D4808E7FA00DBD4E90E602EBDF39573_verboseLabel_en-US" xlink:label="lab_us-gaap_CommonStockParOrStatedValuePerShare_1D4808E7FA00DBD4E90E602EBDF39573" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Common stock, par value (in usd per share)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_1D4808E7FA00DBD4E90E602EBDF39573" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockParOrStatedValuePerShare_1D4808E7FA00DBD4E90E602EBDF39573" xlink:to="lab_us-gaap_CommonStockParOrStatedValuePerShare_1D4808E7FA00DBD4E90E602EBDF39573" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommonStockSharesAuthorized_07058E96162B52844D8A602EBDF37CC1_verboseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesAuthorized_07058E96162B52844D8A602EBDF37CC1" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Common stock, shares authorized (in shares)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_07058E96162B52844D8A602EBDF37CC1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockSharesAuthorized_07058E96162B52844D8A602EBDF37CC1" xlink:to="lab_us-gaap_CommonStockSharesAuthorized_07058E96162B52844D8A602EBDF37CC1" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommonStockSharesIssued_0D2D5AB2E346B920E2E9602EBDF3CA65_verboseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesIssued_0D2D5AB2E346B920E2E9602EBDF3CA65" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Common stock, shares issued (in shares)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaap_CommonStockSharesIssued_0D2D5AB2E346B920E2E9602EBDF3CA65" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockSharesIssued_0D2D5AB2E346B920E2E9602EBDF3CA65" xlink:to="lab_us-gaap_CommonStockSharesIssued_0D2D5AB2E346B920E2E9602EBDF3CA65" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommonStockSharesOutstanding_AFCCD247CE55F1E85E7B602EBDF3CD1B_verboseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding_AFCCD247CE55F1E85E7B602EBDF3CD1B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Common stock, shares outstanding (in shares)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_AFCCD247CE55F1E85E7B602EBDF3CD1B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockSharesOutstanding_AFCCD247CE55F1E85E7B602EBDF3CD1B" xlink:to="lab_us-gaap_CommonStockSharesOutstanding_AFCCD247CE55F1E85E7B602EBDF3CD1B" xlink:type="arc" />
    <link:label id="lab_us-gaap_TreasuryStockShares_FAC5E46FD90A65BD8222602EBDF36878_terseLabel_en-US" xlink:label="lab_us-gaap_TreasuryStockShares_FAC5E46FD90A65BD8222602EBDF36878" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Treasury stock, shares (in shares)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TreasuryStockShares" xlink:label="loc_us-gaap_TreasuryStockShares_FAC5E46FD90A65BD8222602EBDF36878" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TreasuryStockShares_FAC5E46FD90A65BD8222602EBDF36878" xlink:to="lab_us-gaap_TreasuryStockShares_FAC5E46FD90A65BD8222602EBDF36878" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_1835499FD5D6A6196DC9602EBE64A2BC_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_1835499FD5D6A6196DC9602EBE64A2BC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summarized Financial Information of Segments</link:label>
    <link:label id="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_1835499FD5D6A6196DC9602EBE64A2BC_label_en-US" xlink:label="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_1835499FD5D6A6196DC9602EBE64A2BC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Segment Reporting Information, by Segment [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_1835499FD5D6A6196DC9602EBE64A2BC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_1835499FD5D6A6196DC9602EBE64A2BC" xlink:to="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_1835499FD5D6A6196DC9602EBE64A2BC" xlink:type="arc" />
    <link:label id="lab_oas_OwnershipPercentageGuarantor_F51BC13D6E32DD1DF7DD602EBE333103_terseLabel_en-US" xlink:label="lab_oas_OwnershipPercentageGuarantor_F51BC13D6E32DD1DF7DD602EBE333103" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Ownership percentage, guarantors (as percent)</link:label>
    <link:label id="lab_oas_OwnershipPercentageGuarantor_F51BC13D6E32DD1DF7DD602EBE333103_label_en-US" xlink:label="lab_oas_OwnershipPercentageGuarantor_F51BC13D6E32DD1DF7DD602EBE333103" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ownership Percentage Guarantor</link:label>
    <link:label id="lab_oas_OwnershipPercentageGuarantor_F51BC13D6E32DD1DF7DD602EBE333103_documentation_en-US" xlink:label="lab_oas_OwnershipPercentageGuarantor_F51BC13D6E32DD1DF7DD602EBE333103" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Ownership percentage, guarantor</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_OwnershipPercentageGuarantor" xlink:label="loc_oas_OwnershipPercentageGuarantor_F51BC13D6E32DD1DF7DD602EBE333103" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_OwnershipPercentageGuarantor_F51BC13D6E32DD1DF7DD602EBE333103" xlink:to="lab_oas_OwnershipPercentageGuarantor_F51BC13D6E32DD1DF7DD602EBE333103" xlink:type="arc" />
    <link:label id="lab_srt_ScheduleOfCondensedFinancialStatementsTable_8F6A42F04E551B6598338E86D389E037_terseLabel_en-US" xlink:label="lab_srt_ScheduleOfCondensedFinancialStatementsTable_8F6A42F04E551B6598338E86D389E037" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Condensed Financial Statements [Table]</link:label>
    <link:label id="lab_srt_ScheduleOfCondensedFinancialStatementsTable_8F6A42F04E551B6598338E86D389E037_label_en-US" xlink:label="lab_srt_ScheduleOfCondensedFinancialStatementsTable_8F6A42F04E551B6598338E86D389E037" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Condensed Financial Statements [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ScheduleOfCondensedFinancialStatementsTable" xlink:label="loc_srt_ScheduleOfCondensedFinancialStatementsTable_8F6A42F04E551B6598338E86D389E037" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ScheduleOfCondensedFinancialStatementsTable_8F6A42F04E551B6598338E86D389E037" xlink:to="lab_srt_ScheduleOfCondensedFinancialStatementsTable_8F6A42F04E551B6598338E86D389E037" xlink:type="arc" />
    <link:label id="lab_srt_ConsolidatedEntitiesAxis_1CDC43D07E4887A155628E86D389F192_terseLabel_en-US" xlink:label="lab_srt_ConsolidatedEntitiesAxis_1CDC43D07E4887A155628E86D389F192" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consolidated Entities [Axis]</link:label>
    <link:label id="lab_srt_ConsolidatedEntitiesAxis_1CDC43D07E4887A155628E86D389F192_label_en-US" xlink:label="lab_srt_ConsolidatedEntitiesAxis_1CDC43D07E4887A155628E86D389F192" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Consolidated Entities [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ConsolidatedEntitiesAxis" xlink:label="loc_srt_ConsolidatedEntitiesAxis_1CDC43D07E4887A155628E86D389F192" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ConsolidatedEntitiesAxis_1CDC43D07E4887A155628E86D389F192" xlink:to="lab_srt_ConsolidatedEntitiesAxis_1CDC43D07E4887A155628E86D389F192" xlink:type="arc" />
    <link:label id="lab_srt_ConsolidatedEntitiesDomain_3269DA2F6A0DB62E92FC8E86D38A7615_terseLabel_en-US" xlink:label="lab_srt_ConsolidatedEntitiesDomain_3269DA2F6A0DB62E92FC8E86D38A7615" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consolidated Entities [Domain]</link:label>
    <link:label id="lab_srt_ConsolidatedEntitiesDomain_3269DA2F6A0DB62E92FC8E86D38A7615_label_en-US" xlink:label="lab_srt_ConsolidatedEntitiesDomain_3269DA2F6A0DB62E92FC8E86D38A7615" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Consolidated Entities [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ConsolidatedEntitiesDomain" xlink:label="loc_srt_ConsolidatedEntitiesDomain_3269DA2F6A0DB62E92FC8E86D38A7615" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ConsolidatedEntitiesDomain_3269DA2F6A0DB62E92FC8E86D38A7615" xlink:to="lab_srt_ConsolidatedEntitiesDomain_3269DA2F6A0DB62E92FC8E86D38A7615" xlink:type="arc" />
    <link:label id="lab_srt_ParentCompanyMember_5AC486A8B26570998CD88E86D38A4EBE_terseLabel_en-US" xlink:label="lab_srt_ParentCompanyMember_5AC486A8B26570998CD88E86D38A4EBE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Parent/ Issuer</link:label>
    <link:label id="lab_srt_ParentCompanyMember_5AC486A8B26570998CD88E86D38A4EBE_label_en-US" xlink:label="lab_srt_ParentCompanyMember_5AC486A8B26570998CD88E86D38A4EBE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Parent Company [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ParentCompanyMember" xlink:label="loc_srt_ParentCompanyMember_5AC486A8B26570998CD88E86D38A4EBE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ParentCompanyMember_5AC486A8B26570998CD88E86D38A4EBE" xlink:to="lab_srt_ParentCompanyMember_5AC486A8B26570998CD88E86D38A4EBE" xlink:type="arc" />
    <link:label id="lab_srt_GuarantorSubsidiariesMember_2B53AF7F8A4B4D31D4158E86D38A16DB_terseLabel_en-US" xlink:label="lab_srt_GuarantorSubsidiariesMember_2B53AF7F8A4B4D31D4158E86D38A16DB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Combined Guarantor Subsidiaries</link:label>
    <link:label id="lab_srt_GuarantorSubsidiariesMember_2B53AF7F8A4B4D31D4158E86D38A16DB_label_en-US" xlink:label="lab_srt_GuarantorSubsidiariesMember_2B53AF7F8A4B4D31D4158E86D38A16DB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Guarantor Subsidiaries [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_GuarantorSubsidiariesMember" xlink:label="loc_srt_GuarantorSubsidiariesMember_2B53AF7F8A4B4D31D4158E86D38A16DB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_GuarantorSubsidiariesMember_2B53AF7F8A4B4D31D4158E86D38A16DB" xlink:to="lab_srt_GuarantorSubsidiariesMember_2B53AF7F8A4B4D31D4158E86D38A16DB" xlink:type="arc" />
    <link:label id="lab_srt_NonGuarantorSubsidiariesMember_E391043B1C4E5DD833BF8E86D38A1851_terseLabel_en-US" xlink:label="lab_srt_NonGuarantorSubsidiariesMember_E391043B1C4E5DD833BF8E86D38A1851" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Combined Non-guarantor Subsidiaries</link:label>
    <link:label id="lab_srt_NonGuarantorSubsidiariesMember_E391043B1C4E5DD833BF8E86D38A1851_label_en-US" xlink:label="lab_srt_NonGuarantorSubsidiariesMember_E391043B1C4E5DD833BF8E86D38A1851" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-Guarantor Subsidiaries [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_NonGuarantorSubsidiariesMember" xlink:label="loc_srt_NonGuarantorSubsidiariesMember_E391043B1C4E5DD833BF8E86D38A1851" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_NonGuarantorSubsidiariesMember_E391043B1C4E5DD833BF8E86D38A1851" xlink:to="lab_srt_NonGuarantorSubsidiariesMember_E391043B1C4E5DD833BF8E86D38A1851" xlink:type="arc" />
    <link:label id="lab_srt_ConsolidationEliminationsMember_25D8998C6374D98E40D48E86D3909407_terseLabel_en-US" xlink:label="lab_srt_ConsolidationEliminationsMember_25D8998C6374D98E40D48E86D3909407" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Intercompany Eliminations</link:label>
    <link:label id="lab_srt_ConsolidationEliminationsMember_25D8998C6374D98E40D48E86D3909407_label_en-US" xlink:label="lab_srt_ConsolidationEliminationsMember_25D8998C6374D98E40D48E86D3909407" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Consolidation, Eliminations [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ConsolidationEliminationsMember" xlink:label="loc_srt_ConsolidationEliminationsMember_25D8998C6374D98E40D48E86D3909407" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ConsolidationEliminationsMember_25D8998C6374D98E40D48E86D3909407" xlink:to="lab_srt_ConsolidationEliminationsMember_25D8998C6374D98E40D48E86D3909407" xlink:type="arc" />
    <link:label id="lab_srt_CondensedFinancialStatementsCaptionsLineItems_7A913BEB57E81687895B8E86D3903229_terseLabel_en-US" xlink:label="lab_srt_CondensedFinancialStatementsCaptionsLineItems_7A913BEB57E81687895B8E86D3903229" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Condensed Financial Statements, Captions [Line Items]</link:label>
    <link:label id="lab_srt_CondensedFinancialStatementsCaptionsLineItems_7A913BEB57E81687895B8E86D3903229_label_en-US" xlink:label="lab_srt_CondensedFinancialStatementsCaptionsLineItems_7A913BEB57E81687895B8E86D3903229" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Condensed Financial Statements, Captions [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_CondensedFinancialStatementsCaptionsLineItems" xlink:label="loc_srt_CondensedFinancialStatementsCaptionsLineItems_7A913BEB57E81687895B8E86D3903229" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_7A913BEB57E81687895B8E86D3903229" xlink:to="lab_srt_CondensedFinancialStatementsCaptionsLineItems_7A913BEB57E81687895B8E86D3903229" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetsCurrentAbstract_0D9E93CDB6BF034FB0B88E86D39166E3_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrentAbstract_0D9E93CDB6BF034FB0B88E86D39166E3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_us-gaap_AssetsCurrentAbstract_0D9E93CDB6BF034FB0B88E86D39166E3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsCurrentAbstract_0D9E93CDB6BF034FB0B88E86D39166E3" xlink:to="lab_us-gaap_AssetsCurrentAbstract_0D9E93CDB6BF034FB0B88E86D39166E3" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccountsReceivableNetCurrent_731FF82A5ED1EEE5DBFD8E86D3921687_verboseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_731FF82A5ED1EEE5DBFD8E86D3921687" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Accounts receivable, net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_731FF82A5ED1EEE5DBFD8E86D3921687" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountsReceivableNetCurrent_731FF82A5ED1EEE5DBFD8E86D3921687" xlink:to="lab_us-gaap_AccountsReceivableNetCurrent_731FF82A5ED1EEE5DBFD8E86D3921687" xlink:type="arc" />
    <link:label id="lab_us-gaap_DueFromAffiliateCurrent_90188FF4E190EE0F60068E86D3920930_terseLabel_en-US" xlink:label="lab_us-gaap_DueFromAffiliateCurrent_90188FF4E190EE0F60068E86D3920930" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts receivable - affiliates</link:label>
    <link:label id="lab_us-gaap_DueFromAffiliateCurrent_90188FF4E190EE0F60068E86D3920930_label_en-US" xlink:label="lab_us-gaap_DueFromAffiliateCurrent_90188FF4E190EE0F60068E86D3920930" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Due from Affiliate, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DueFromAffiliateCurrent" xlink:label="loc_us-gaap_DueFromAffiliateCurrent_90188FF4E190EE0F60068E86D3920930" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DueFromAffiliateCurrent_90188FF4E190EE0F60068E86D3920930" xlink:to="lab_us-gaap_DueFromAffiliateCurrent_90188FF4E190EE0F60068E86D3920930" xlink:type="arc" />
    <link:label id="lab_us-gaap_InventoryNet_79C994C6C97DB9E821DE8E86D3928709_verboseLabel_en-US" xlink:label="lab_us-gaap_InventoryNet_79C994C6C97DB9E821DE8E86D3928709" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Inventory</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_79C994C6C97DB9E821DE8E86D3928709" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryNet_79C994C6C97DB9E821DE8E86D3928709" xlink:to="lab_us-gaap_InventoryNet_79C994C6C97DB9E821DE8E86D3928709" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNetAbstract_2F496A28AAB6D24D6C7D8E86D3939ED9_verboseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNetAbstract_2F496A28AAB6D24D6C7D8E86D3939ED9" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Property, plant and equipment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNetAbstract" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_2F496A28AAB6D24D6C7D8E86D3939ED9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_2F496A28AAB6D24D6C7D8E86D3939ED9" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentNetAbstract_2F496A28AAB6D24D6C7D8E86D3939ED9" xlink:type="arc" />
    <link:label id="lab_oas_InvestmentsInAndAdvancesToAffiliates_BB3BE24FD210FA86247A8E86D394D7FC_terseLabel_en-US" xlink:label="lab_oas_InvestmentsInAndAdvancesToAffiliates_BB3BE24FD210FA86247A8E86D394D7FC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investments in and advances to subsidiaries</link:label>
    <link:label id="lab_oas_InvestmentsInAndAdvancesToAffiliates_BB3BE24FD210FA86247A8E86D394D7FC_label_en-US" xlink:label="lab_oas_InvestmentsInAndAdvancesToAffiliates_BB3BE24FD210FA86247A8E86D394D7FC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investments In And Advances To Affiliates</link:label>
    <link:label id="lab_oas_InvestmentsInAndAdvancesToAffiliates_BB3BE24FD210FA86247A8E86D394D7FC_documentation_en-US" xlink:label="lab_oas_InvestmentsInAndAdvancesToAffiliates_BB3BE24FD210FA86247A8E86D394D7FC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Investment in common stock of, contributed capital to, equity in cumulative net income and loss of, and net intercompany advances to/from consolidated subsidiaries.</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_InvestmentsInAndAdvancesToAffiliates" xlink:label="loc_oas_InvestmentsInAndAdvancesToAffiliates_BB3BE24FD210FA86247A8E86D394D7FC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_InvestmentsInAndAdvancesToAffiliates_BB3BE24FD210FA86247A8E86D394D7FC" xlink:to="lab_oas_InvestmentsInAndAdvancesToAffiliates_BB3BE24FD210FA86247A8E86D394D7FC" xlink:type="arc" />
    <link:label id="lab_us-gaap_DeferredIncomeTaxAssetsNet_7DA9950408ABF5F70BD38E86D3958BD6_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxAssetsNet_7DA9950408ABF5F70BD38E86D3958BD6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred income taxes</link:label>
    <link:label id="lab_us-gaap_DeferredIncomeTaxAssetsNet_7DA9950408ABF5F70BD38E86D3958BD6_label_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxAssetsNet_7DA9950408ABF5F70BD38E86D3958BD6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Income Tax Assets, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredIncomeTaxAssetsNet" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_7DA9950408ABF5F70BD38E86D3958BD6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredIncomeTaxAssetsNet_7DA9950408ABF5F70BD38E86D3958BD6" xlink:to="lab_us-gaap_DeferredIncomeTaxAssetsNet_7DA9950408ABF5F70BD38E86D3958BD6" xlink:type="arc" />
    <link:label id="lab_us-gaap_DueToAffiliateCurrent_967644D88D68C30658EC8E86D3969653_verboseLabel_en-US" xlink:label="lab_us-gaap_DueToAffiliateCurrent_967644D88D68C30658EC8E86D3969653" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Accounts payable - affiliates</link:label>
    <link:label id="lab_us-gaap_DueToAffiliateCurrent_967644D88D68C30658EC8E86D3969653_label_en-US" xlink:label="lab_us-gaap_DueToAffiliateCurrent_967644D88D68C30658EC8E86D3969653" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Due to Affiliate, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DueToAffiliateCurrent" xlink:label="loc_us-gaap_DueToAffiliateCurrent_967644D88D68C30658EC8E86D3969653" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DueToAffiliateCurrent_967644D88D68C30658EC8E86D3969653" xlink:to="lab_us-gaap_DueToAffiliateCurrent_967644D88D68C30658EC8E86D3969653" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccruedLiabilitiesCurrent_2A29B09CA51D095FE0E28E86D396EA13_verboseLabel_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrent_2A29B09CA51D095FE0E28E86D396EA13" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Accrued liabilities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_2A29B09CA51D095FE0E28E86D396EA13" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_2A29B09CA51D095FE0E28E86D396EA13" xlink:to="lab_us-gaap_AccruedLiabilitiesCurrent_2A29B09CA51D095FE0E28E86D396EA13" xlink:type="arc" />
    <link:label id="lab_us-gaap_InterestPayableCurrent_67E66D79D1182044BB788E86D3983665_verboseLabel_en-US" xlink:label="lab_us-gaap_InterestPayableCurrent_67E66D79D1182044BB788E86D3983665" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Accrued interest payable</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestPayableCurrent" xlink:label="loc_us-gaap_InterestPayableCurrent_67E66D79D1182044BB788E86D3983665" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestPayableCurrent_67E66D79D1182044BB788E86D3983665" xlink:to="lab_us-gaap_InterestPayableCurrent_67E66D79D1182044BB788E86D3983665" xlink:type="arc" />
    <link:label id="lab_oas_AdvancesFromJointInterestPartnersCurrent_3ED1B4FA92A7EF963E798E86D39C8A69_verboseLabel_en-US" xlink:label="lab_oas_AdvancesFromJointInterestPartnersCurrent_3ED1B4FA92A7EF963E798E86D39C8A69" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Advances from joint interest partners</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_AdvancesFromJointInterestPartnersCurrent" xlink:label="loc_oas_AdvancesFromJointInterestPartnersCurrent_3ED1B4FA92A7EF963E798E86D39C8A69" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_AdvancesFromJointInterestPartnersCurrent_3ED1B4FA92A7EF963E798E86D39C8A69" xlink:to="lab_oas_AdvancesFromJointInterestPartnersCurrent_3ED1B4FA92A7EF963E798E86D39C8A69" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeLiabilitiesNoncurrent_00F6945BCA9D2E5B2F848E86D39DC692_verboseLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilitiesNoncurrent_00F6945BCA9D2E5B2F848E86D39DC692" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Derivative instruments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeLiabilitiesNoncurrent" xlink:label="loc_us-gaap_DerivativeLiabilitiesNoncurrent_00F6945BCA9D2E5B2F848E86D39DC692" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLiabilitiesNoncurrent_00F6945BCA9D2E5B2F848E86D39DC692" xlink:to="lab_us-gaap_DerivativeLiabilitiesNoncurrent_00F6945BCA9D2E5B2F848E86D39DC692" xlink:type="arc" />
    <link:label id="lab_us-gaap_EquityAbstract_EEE2E92E76F5574233F58E86D39E8FBE_terseLabel_en-US" xlink:label="lab_us-gaap_EquityAbstract_EEE2E92E76F5574233F58E86D39E8FBE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stockholders&#8217; equity</link:label>
    <link:label id="lab_us-gaap_EquityAbstract_EEE2E92E76F5574233F58E86D39E8FBE_label_en-US" xlink:label="lab_us-gaap_EquityAbstract_EEE2E92E76F5574233F58E86D39E8FBE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityAbstract" xlink:label="loc_us-gaap_EquityAbstract_EEE2E92E76F5574233F58E86D39E8FBE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EquityAbstract_EEE2E92E76F5574233F58E86D39E8FBE" xlink:to="lab_us-gaap_EquityAbstract_EEE2E92E76F5574233F58E86D39E8FBE" xlink:type="arc" />
    <link:label id="lab_oas_CapitalContributions_A188927F83635E02D5BE8E86D39E5988_terseLabel_en-US" xlink:label="lab_oas_CapitalContributions_A188927F83635E02D5BE8E86D39E5988" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Capital contributions from affiliates</link:label>
    <link:label id="lab_oas_CapitalContributions_A188927F83635E02D5BE8E86D39E5988_label_en-US" xlink:label="lab_oas_CapitalContributions_A188927F83635E02D5BE8E86D39E5988" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Contributions</link:label>
    <link:label id="lab_oas_CapitalContributions_A188927F83635E02D5BE8E86D39E5988_documentation_en-US" xlink:label="lab_oas_CapitalContributions_A188927F83635E02D5BE8E86D39E5988" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Total capital contributions from the parent company. Includes long-term advances payable from the subsidiaries to the parent.</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_CapitalContributions" xlink:label="loc_oas_CapitalContributions_A188927F83635E02D5BE8E86D39E5988" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_CapitalContributions_A188927F83635E02D5BE8E86D39E5988" xlink:to="lab_oas_CapitalContributions_A188927F83635E02D5BE8E86D39E5988" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommonStockValue_47E861DAE2C9749B6E028E86D39F0A93_verboseLabel_en-US" xlink:label="lab_us-gaap_CommonStockValue_47E861DAE2C9749B6E028E86D39F0A93" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Common stock, $0.01 par value: 450,000,000 shares authorized; 320,010,501 shares issued and 317,987,427 shares outstanding at June 30, 2018 and 270,627,014 shares issued and 269,295,466 shares outstanding at December 31, 2017</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaap_CommonStockValue_47E861DAE2C9749B6E028E86D39F0A93" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockValue_47E861DAE2C9749B6E028E86D39F0A93" xlink:to="lab_us-gaap_CommonStockValue_47E861DAE2C9749B6E028E86D39F0A93" xlink:type="arc" />
    <link:label id="lab_us-gaap_TreasuryStockValue_0EF2FB506610076D41208E86D39FCDD4_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_TreasuryStockValue_0EF2FB506610076D41208E86D39FCDD4" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Treasury stock, at cost: 2,023,074 and 1,331,548 shares at June 30, 2018 and December 31, 2017, respectively</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TreasuryStockValue" xlink:label="loc_us-gaap_TreasuryStockValue_0EF2FB506610076D41208E86D39FCDD4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TreasuryStockValue_0EF2FB506610076D41208E86D39FCDD4" xlink:to="lab_us-gaap_TreasuryStockValue_0EF2FB506610076D41208E86D39FCDD4" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetRetirementObligationDisclosureTextBlock_BC99EE0CCB8D151BA9BE602EBEA44B5E_terseLabel_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationDisclosureTextBlock_BC99EE0CCB8D151BA9BE602EBEA44B5E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Asset Retirement Obligations</link:label>
    <link:label id="lab_us-gaap_AssetRetirementObligationDisclosureTextBlock_BC99EE0CCB8D151BA9BE602EBEA44B5E_label_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationDisclosureTextBlock_BC99EE0CCB8D151BA9BE602EBEA44B5E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Retirement Obligation Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetRetirementObligationDisclosureTextBlock" xlink:label="loc_us-gaap_AssetRetirementObligationDisclosureTextBlock_BC99EE0CCB8D151BA9BE602EBEA44B5E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetRetirementObligationDisclosureTextBlock_BC99EE0CCB8D151BA9BE602EBEA44B5E" xlink:to="lab_us-gaap_AssetRetirementObligationDisclosureTextBlock_BC99EE0CCB8D151BA9BE602EBEA44B5E" xlink:type="arc" />
    <link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_603A92C7D128B7802AF88E86D2E3499D_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_603A92C7D128B7802AF88E86D2E3499D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by (used in) operating activities:</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_603A92C7D128B7802AF88E86D2E3499D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_603A92C7D128B7802AF88E86D2E3499D" xlink:to="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_603A92C7D128B7802AF88E86D2E3499D" xlink:type="arc" />
    <link:label id="lab_oas_EquityInEarningsInSubsidiaries_BD938964C65CDD7EB4DA8E86D2E33C68_negatedTerseLabel_en-US" xlink:label="lab_oas_EquityInEarningsInSubsidiaries_BD938964C65CDD7EB4DA8E86D2E33C68" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Equity in earnings (loss) of subsidiaries</link:label>
    <link:label id="lab_oas_EquityInEarningsInSubsidiaries_BD938964C65CDD7EB4DA8E86D2E33C68_label_en-US" xlink:label="lab_oas_EquityInEarningsInSubsidiaries_BD938964C65CDD7EB4DA8E86D2E33C68" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity In Earnings In Subsidiaries</link:label>
    <link:label id="lab_oas_EquityInEarningsInSubsidiaries_BD938964C65CDD7EB4DA8E86D2E33C68_documentation_en-US" xlink:label="lab_oas_EquityInEarningsInSubsidiaries_BD938964C65CDD7EB4DA8E86D2E33C68" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This item represents the entity's proportionate share for the period of the net income (loss) of its consolidated subsidiaries.</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_EquityInEarningsInSubsidiaries" xlink:label="loc_oas_EquityInEarningsInSubsidiaries_BD938964C65CDD7EB4DA8E86D2E33C68" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_EquityInEarningsInSubsidiaries_BD938964C65CDD7EB4DA8E86D2E33C68" xlink:to="lab_oas_EquityInEarningsInSubsidiaries_BD938964C65CDD7EB4DA8E86D2E33C68" xlink:type="arc" />
    <link:label id="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_4FFB53583142B10AFB478E86D2E44D12_verboseLabel_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_4FFB53583142B10AFB478E86D2E44D12" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Deferred income taxes</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_4FFB53583142B10AFB478E86D2E44D12" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_4FFB53583142B10AFB478E86D2E44D12" xlink:to="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_4FFB53583142B10AFB478E86D2E44D12" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeGainLossOnDerivativeNet_DA195849F91D191950A68E86D2E441A5_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DerivativeGainLossOnDerivativeNet_DA195849F91D191950A68E86D2E441A5" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Derivative instruments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeGainLossOnDerivativeNet" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_DA195849F91D191950A68E86D2E441A5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeGainLossOnDerivativeNet_DA195849F91D191950A68E86D2E441A5" xlink:to="lab_us-gaap_DerivativeGainLossOnDerivativeNet_DA195849F91D191950A68E86D2E441A5" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_7FC7483F679880FE1F098E86D2E5B841_verboseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_7FC7483F679880FE1F098E86D2E5B841" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Working capital and other changes:</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_7FC7483F679880FE1F098E86D2E5B841" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_7FC7483F679880FE1F098E86D2E5B841" xlink:to="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_7FC7483F679880FE1F098E86D2E5B841" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_A63C9E306C2D7C342F0E8E86D2E5CD79_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_A63C9E306C2D7C342F0E8E86D2E5CD79" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Change in accounts receivable, net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_A63C9E306C2D7C342F0E8E86D2E5CD79" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_A63C9E306C2D7C342F0E8E86D2E5CD79" xlink:to="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_A63C9E306C2D7C342F0E8E86D2E5CD79" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInInventories_8F7A48F3A2556265B1AF8E86D2E52B83_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInInventories_8F7A48F3A2556265B1AF8E86D2E52B83" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Change in inventory</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_8F7A48F3A2556265B1AF8E86D2E52B83" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInInventories_8F7A48F3A2556265B1AF8E86D2E52B83" xlink:to="lab_us-gaap_IncreaseDecreaseInInventories_8F7A48F3A2556265B1AF8E86D2E52B83" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInPrepaidExpense_3718D10F023AE7E8CED78E86D2E62D7A_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPrepaidExpense_3718D10F023AE7E8CED78E86D2E62D7A" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Change in prepaid expenses</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidExpense" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidExpense_3718D10F023AE7E8CED78E86D2E62D7A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInPrepaidExpense_3718D10F023AE7E8CED78E86D2E62D7A" xlink:to="lab_us-gaap_IncreaseDecreaseInPrepaidExpense_3718D10F023AE7E8CED78E86D2E62D7A" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_E6A6303AC03299C273C18E86D2EB1367_verboseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_E6A6303AC03299C273C18E86D2EB1367" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Change in accounts payable, interest payable and accrued liabilities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_E6A6303AC03299C273C18E86D2EB1367" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_E6A6303AC03299C273C18E86D2EB1367" xlink:to="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_E6A6303AC03299C273C18E86D2EB1367" xlink:type="arc" />
    <link:label id="lab_us-gaap_RepaymentsOfLongTermLinesOfCredit_D26C4F9FE073F5B6E9108E86D2EEF886_negatedLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfLongTermLinesOfCredit_D26C4F9FE073F5B6E9108E86D2EEF886" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Principal payments on revolving credit facility</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RepaymentsOfLongTermLinesOfCredit" xlink:label="loc_us-gaap_RepaymentsOfLongTermLinesOfCredit_D26C4F9FE073F5B6E9108E86D2EEF886" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RepaymentsOfLongTermLinesOfCredit_D26C4F9FE073F5B6E9108E86D2EEF886" xlink:to="lab_us-gaap_RepaymentsOfLongTermLinesOfCredit_D26C4F9FE073F5B6E9108E86D2EEF886" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsOfDebtIssuanceCosts_F78F5002F21DCC4533C28E86D2EE625F_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfDebtIssuanceCosts_F78F5002F21DCC4533C28E86D2EE625F" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Deferred financing costs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsOfDebtIssuanceCosts" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_F78F5002F21DCC4533C28E86D2EE625F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsOfDebtIssuanceCosts_F78F5002F21DCC4533C28E86D2EE625F" xlink:to="lab_us-gaap_PaymentsOfDebtIssuanceCosts_F78F5002F21DCC4533C28E86D2EE625F" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_7ADBD0D36264F6589A328E86D2EE8AF9_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_7ADBD0D36264F6589A328E86D2EE8AF9" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Purchases of treasury stock</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_7ADBD0D36264F6589A328E86D2EE8AF9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_7ADBD0D36264F6589A328E86D2EE8AF9" xlink:to="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_7ADBD0D36264F6589A328E86D2EE8AF9" xlink:type="arc" />
    <link:label id="lab_oas_ProceedsfromPaymentsforContributionsfromtoAffiliates_4441606F2EE41F2474328E86D2EE80DF_terseLabel_en-US" xlink:label="lab_oas_ProceedsfromPaymentsforContributionsfromtoAffiliates_4441606F2EE41F2474328E86D2EE80DF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investment in / capital contributions from subsidiaries</link:label>
    <link:label id="lab_oas_ProceedsfromPaymentsforContributionsfromtoAffiliates_4441606F2EE41F2474328E86D2EE80DF_label_en-US" xlink:label="lab_oas_ProceedsfromPaymentsforContributionsfromtoAffiliates_4441606F2EE41F2474328E86D2EE80DF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from (Payments for) Contributions from (to) Affiliates</link:label>
    <link:label id="lab_oas_ProceedsfromPaymentsforContributionsfromtoAffiliates_4441606F2EE41F2474328E86D2EE80DF_documentation_en-US" xlink:label="lab_oas_ProceedsfromPaymentsforContributionsfromtoAffiliates_4441606F2EE41F2474328E86D2EE80DF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Proceeds from (Payments for) Contributions from (to) Affiliates</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_ProceedsfromPaymentsforContributionsfromtoAffiliates" xlink:label="loc_oas_ProceedsfromPaymentsforContributionsfromtoAffiliates_4441606F2EE41F2474328E86D2EE80DF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_ProceedsfromPaymentsforContributionsfromtoAffiliates_4441606F2EE41F2474328E86D2EE80DF" xlink:to="lab_oas_ProceedsfromPaymentsforContributionsfromtoAffiliates_4441606F2EE41F2474328E86D2EE80DF" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseRightOfUseAsset_EDC4F7D4EB316C56E3D38F50F372F21A_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseRightOfUseAsset_EDC4F7D4EB316C56E3D38F50F372F21A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finance lease assets</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseRightOfUseAsset_EDC4F7D4EB316C56E3D38F50F372F21A_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseRightOfUseAsset_EDC4F7D4EB316C56E3D38F50F372F21A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Right-of-Use Asset</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAsset" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_EDC4F7D4EB316C56E3D38F50F372F21A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseRightOfUseAsset_EDC4F7D4EB316C56E3D38F50F372F21A" xlink:to="lab_us-gaap_FinanceLeaseRightOfUseAsset_EDC4F7D4EB316C56E3D38F50F372F21A" xlink:type="arc" />
    <link:label id="lab_oas_LesseeRightOfUseAsset_F132D3C512368FA30AD28F50F372DF32_totalLabel_en-US" xlink:label="lab_oas_LesseeRightOfUseAsset_F132D3C512368FA30AD28F50F372DF32" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total lease assets</link:label>
    <link:label id="lab_oas_LesseeRightOfUseAsset_F132D3C512368FA30AD28F50F372DF32_label_en-US" xlink:label="lab_oas_LesseeRightOfUseAsset_F132D3C512368FA30AD28F50F372DF32" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Right-Of-Use Asset</link:label>
    <link:label id="lab_oas_LesseeRightOfUseAsset_F132D3C512368FA30AD28F50F372DF32_documentation_en-US" xlink:label="lab_oas_LesseeRightOfUseAsset_F132D3C512368FA30AD28F50F372DF32" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Lessee, Right-Of-Use Asset</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_LesseeRightOfUseAsset" xlink:label="loc_oas_LesseeRightOfUseAsset_F132D3C512368FA30AD28F50F372DF32" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_LesseeRightOfUseAsset_F132D3C512368FA30AD28F50F372DF32" xlink:to="lab_oas_LesseeRightOfUseAsset_F132D3C512368FA30AD28F50F372DF32" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseLiabilityCurrent_B82AE94997850AC5A2B68F50F3736E79_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityCurrent_B82AE94997850AC5A2B68F50F3736E79" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating lease liabilities, current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_B82AE94997850AC5A2B68F50F3736E79" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLiabilityCurrent_B82AE94997850AC5A2B68F50F3736E79" xlink:to="lab_us-gaap_OperatingLeaseLiabilityCurrent_B82AE94997850AC5A2B68F50F3736E79" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityCurrent_D74051802756BBD493FF8F50F3735D59_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityCurrent_D74051802756BBD493FF8F50F3735D59" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finance lease liabilities, current</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityCurrent_D74051802756BBD493FF8F50F3735D59_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityCurrent_D74051802756BBD493FF8F50F3735D59" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseLiabilityCurrent" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_D74051802756BBD493FF8F50F3735D59" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityCurrent_D74051802756BBD493FF8F50F3735D59" xlink:to="lab_us-gaap_FinanceLeaseLiabilityCurrent_D74051802756BBD493FF8F50F3735D59" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_06A00547BA6ECF38453F8F50F3733EDB_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_06A00547BA6ECF38453F8F50F3733EDB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating lease liabilities, noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_06A00547BA6ECF38453F8F50F3733EDB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_06A00547BA6ECF38453F8F50F3733EDB" xlink:to="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_06A00547BA6ECF38453F8F50F3733EDB" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_6418CEAD387812A479998F50F3730F05_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_6418CEAD387812A479998F50F3730F05" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finance lease liabilities, noncurrent</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_6418CEAD387812A479998F50F3730F05_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_6418CEAD387812A479998F50F3730F05" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_6418CEAD387812A479998F50F3730F05" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_6418CEAD387812A479998F50F3730F05" xlink:to="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_6418CEAD387812A479998F50F3730F05" xlink:type="arc" />
    <link:label id="lab_oas_LesseeLeaseLiability_D94F4A56A7FCB5289B7D8F50F373F031_totalLabel_en-US" xlink:label="lab_oas_LesseeLeaseLiability_D94F4A56A7FCB5289B7D8F50F373F031" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total lease liabilities</link:label>
    <link:label id="lab_oas_LesseeLeaseLiability_D94F4A56A7FCB5289B7D8F50F373F031_label_en-US" xlink:label="lab_oas_LesseeLeaseLiability_D94F4A56A7FCB5289B7D8F50F373F031" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Lease Liability</link:label>
    <link:label id="lab_oas_LesseeLeaseLiability_D94F4A56A7FCB5289B7D8F50F373F031_documentation_en-US" xlink:label="lab_oas_LesseeLeaseLiability_D94F4A56A7FCB5289B7D8F50F373F031" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Lessee, Lease Liability</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_LesseeLeaseLiability" xlink:label="loc_oas_LesseeLeaseLiability_D94F4A56A7FCB5289B7D8F50F373F031" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_LesseeLeaseLiability_D94F4A56A7FCB5289B7D8F50F373F031" xlink:to="lab_oas_LesseeLeaseLiability_D94F4A56A7FCB5289B7D8F50F373F031" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeLeaseDescriptionTable_395B754B44490FED1C928E65E6ACC636_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeLeaseDescriptionTable_395B754B44490FED1C928E65E6ACC636" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lessee, Lease, Description [Table]</link:label>
    <link:label id="lab_us-gaap_LesseeLeaseDescriptionTable_395B754B44490FED1C928E65E6ACC636_label_en-US" xlink:label="lab_us-gaap_LesseeLeaseDescriptionTable_395B754B44490FED1C928E65E6ACC636" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Lease, Description [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeLeaseDescriptionTable" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_395B754B44490FED1C928E65E6ACC636" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_395B754B44490FED1C928E65E6ACC636" xlink:to="lab_us-gaap_LesseeLeaseDescriptionTable_395B754B44490FED1C928E65E6ACC636" xlink:type="arc" />
    <link:label id="lab_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_BE2C3421664EF163C8D88E65E6AD5645_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_BE2C3421664EF163C8D88E65E6AD5645" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Adjustments for New Accounting Pronouncements [Axis]</link:label>
    <link:label id="lab_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_BE2C3421664EF163C8D88E65E6AD5645_label_en-US" xlink:label="lab_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_BE2C3421664EF163C8D88E65E6AD5645" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments for New Accounting Pronouncements [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_BE2C3421664EF163C8D88E65E6AD5645" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_BE2C3421664EF163C8D88E65E6AD5645" xlink:to="lab_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_BE2C3421664EF163C8D88E65E6AD5645" xlink:type="arc" />
    <link:label id="lab_us-gaap_TypeOfAdoptionMember_B522148CB4C29B6249398E65E6AD81D6_terseLabel_en-US" xlink:label="lab_us-gaap_TypeOfAdoptionMember_B522148CB4C29B6249398E65E6AD81D6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Type of Adoption [Domain]</link:label>
    <link:label id="lab_us-gaap_TypeOfAdoptionMember_B522148CB4C29B6249398E65E6AD81D6_label_en-US" xlink:label="lab_us-gaap_TypeOfAdoptionMember_B522148CB4C29B6249398E65E6AD81D6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Type of Adoption [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_B522148CB4C29B6249398E65E6AD81D6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TypeOfAdoptionMember_B522148CB4C29B6249398E65E6AD81D6" xlink:to="lab_us-gaap_TypeOfAdoptionMember_B522148CB4C29B6249398E65E6AD81D6" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccountingStandardsUpdate201602Member_8E51FBD1689F4B657C3E8E65E6AD1CD0_terseLabel_en-US" xlink:label="lab_us-gaap_AccountingStandardsUpdate201602Member_8E51FBD1689F4B657C3E8E65E6AD1CD0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounting Standards Update 2016-02</link:label>
    <link:label id="lab_us-gaap_AccountingStandardsUpdate201602Member_8E51FBD1689F4B657C3E8E65E6AD1CD0_label_en-US" xlink:label="lab_us-gaap_AccountingStandardsUpdate201602Member_8E51FBD1689F4B657C3E8E65E6AD1CD0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounting Standards Update 2016-02 [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountingStandardsUpdate201602Member" xlink:label="loc_us-gaap_AccountingStandardsUpdate201602Member_8E51FBD1689F4B657C3E8E65E6AD1CD0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountingStandardsUpdate201602Member_8E51FBD1689F4B657C3E8E65E6AD1CD0" xlink:to="lab_us-gaap_AccountingStandardsUpdate201602Member_8E51FBD1689F4B657C3E8E65E6AD1CD0" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeLeaseDescriptionLineItems_26163F903B42E35A35358E65E6AE0400_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeLeaseDescriptionLineItems_26163F903B42E35A35358E65E6AE0400" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lessee, Lease, Description [Line Items]</link:label>
    <link:label id="lab_us-gaap_LesseeLeaseDescriptionLineItems_26163F903B42E35A35358E65E6AE0400_label_en-US" xlink:label="lab_us-gaap_LesseeLeaseDescriptionLineItems_26163F903B42E35A35358E65E6AE0400" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Lease, Description [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeLeaseDescriptionLineItems" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_26163F903B42E35A35358E65E6AE0400" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_26163F903B42E35A35358E65E6AE0400" xlink:to="lab_us-gaap_LesseeLeaseDescriptionLineItems_26163F903B42E35A35358E65E6AE0400" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseRightOfUseAsset_4A8401141A068D2F054D8E65E6AE2433_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseRightOfUseAsset_4A8401141A068D2F054D8E65E6AE2433" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating lease assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_4A8401141A068D2F054D8E65E6AE2433" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseRightOfUseAsset_4A8401141A068D2F054D8E65E6AE2433" xlink:to="lab_us-gaap_OperatingLeaseRightOfUseAsset_4A8401141A068D2F054D8E65E6AE2433" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseLiability_F9BC2059BE769BB3B31F8E65E6AEF31A_verboseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiability_F9BC2059BE769BB3B31F8E65E6AEF31A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Operating lease liabilities</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseLiability_F9BC2059BE769BB3B31F8E65E6AEF31A_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiability_F9BC2059BE769BB3B31F8E65E6AEF31A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Liability</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_F9BC2059BE769BB3B31F8E65E6AEF31A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLiability_F9BC2059BE769BB3B31F8E65E6AEF31A" xlink:to="lab_us-gaap_OperatingLeaseLiability_F9BC2059BE769BB3B31F8E65E6AEF31A" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseRightOfUseAsset_476BBD8F0C824F5DC8378E65E6AE64F4_verboseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseRightOfUseAsset_476BBD8F0C824F5DC8378E65E6AE64F4" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Finance lease ROU assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAsset" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_476BBD8F0C824F5DC8378E65E6AE64F4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseRightOfUseAsset_476BBD8F0C824F5DC8378E65E6AE64F4" xlink:to="lab_us-gaap_FinanceLeaseRightOfUseAsset_476BBD8F0C824F5DC8378E65E6AE64F4" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiability_FD8C5051BECAFAE41C9F8E65E6AE36B2_verboseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiability_FD8C5051BECAFAE41C9F8E65E6AE36B2" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Finance lease liabilities</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiability_FD8C5051BECAFAE41C9F8E65E6AE36B2_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiability_FD8C5051BECAFAE41C9F8E65E6AE36B2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseLiability" xlink:label="loc_us-gaap_FinanceLeaseLiability_FD8C5051BECAFAE41C9F8E65E6AE36B2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiability_FD8C5051BECAFAE41C9F8E65E6AE36B2" xlink:to="lab_us-gaap_FinanceLeaseLiability_FD8C5051BECAFAE41C9F8E65E6AE36B2" xlink:type="arc" />
    <link:label id="lab_oas_FinanceLeaseRightOfUseAssetAccumulatedDepreciation_F3A772AAB2EF9F41A69C8E65E6AFF3CF_terseLabel_en-US" xlink:label="lab_oas_FinanceLeaseRightOfUseAssetAccumulatedDepreciation_F3A772AAB2EF9F41A69C8E65E6AFF3CF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finance lease ROU assets accumulated amortization</link:label>
    <link:label id="lab_oas_FinanceLeaseRightOfUseAssetAccumulatedDepreciation_F3A772AAB2EF9F41A69C8E65E6AFF3CF_label_en-US" xlink:label="lab_oas_FinanceLeaseRightOfUseAssetAccumulatedDepreciation_F3A772AAB2EF9F41A69C8E65E6AFF3CF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Right-Of-Use Asset, Accumulated Depreciation</link:label>
    <link:label id="lab_oas_FinanceLeaseRightOfUseAssetAccumulatedDepreciation_F3A772AAB2EF9F41A69C8E65E6AFF3CF_documentation_en-US" xlink:label="lab_oas_FinanceLeaseRightOfUseAssetAccumulatedDepreciation_F3A772AAB2EF9F41A69C8E65E6AFF3CF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Finance Lease, Right-Of-Use Asset, Accumulated Depreciation</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_FinanceLeaseRightOfUseAssetAccumulatedDepreciation" xlink:label="loc_oas_FinanceLeaseRightOfUseAssetAccumulatedDepreciation_F3A772AAB2EF9F41A69C8E65E6AFF3CF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_FinanceLeaseRightOfUseAssetAccumulatedDepreciation_F3A772AAB2EF9F41A69C8E65E6AFF3CF" xlink:to="lab_oas_FinanceLeaseRightOfUseAssetAccumulatedDepreciation_F3A772AAB2EF9F41A69C8E65E6AFF3CF" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities_7179DD31D4371B5C42AD8E86D7878644_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities_7179DD31D4371B5C42AD8E86D7878644" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative credit risk valuation adjustment, derivative liabilities</link:label>
    <link:label id="lab_us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities_7179DD31D4371B5C42AD8E86D7878644_label_en-US" xlink:label="lab_us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities_7179DD31D4371B5C42AD8E86D7878644" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Credit Risk Valuation Adjustment, Derivative Liabilities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities" xlink:label="loc_us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities_7179DD31D4371B5C42AD8E86D7878644" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities_7179DD31D4371B5C42AD8E86D7878644" xlink:to="lab_us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities_7179DD31D4371B5C42AD8E86D7878644" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeAssets_9BAD2DEA40041F8445D68E86D7874AD4_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeAssets_9BAD2DEA40041F8445D68E86D7874AD4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative credit risk valuation adjustment, derivative assets</link:label>
    <link:label id="lab_us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeAssets_9BAD2DEA40041F8445D68E86D7874AD4_label_en-US" xlink:label="lab_us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeAssets_9BAD2DEA40041F8445D68E86D7874AD4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Credit Risk Valuation Adjustment, Derivative Assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeAssets" xlink:label="loc_us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeAssets_9BAD2DEA40041F8445D68E86D7874AD4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeAssets_9BAD2DEA40041F8445D68E86D7874AD4" xlink:to="lab_us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeAssets_9BAD2DEA40041F8445D68E86D7874AD4" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_5D85333BCB0AAB94E0E58E86D44B6658_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_5D85333BCB0AAB94E0E58E86D44B6658" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Leases</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_5D85333BCB0AAB94E0E58E86D44B6658_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_5D85333BCB0AAB94E0E58E86D44B6658" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease Liabilities, Payments Due [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract" xlink:label="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_5D85333BCB0AAB94E0E58E86D44B6658" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_5D85333BCB0AAB94E0E58E86D44B6658" xlink:to="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_5D85333BCB0AAB94E0E58E86D44B6658" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_7C918866B37275DF34698E86D44B07A8_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_7C918866B37275DF34698E86D44B07A8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019 (excluding the three months ended March 31, 2019)</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_7C918866B37275DF34698E86D44B07A8_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_7C918866B37275DF34698E86D44B07A8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_7C918866B37275DF34698E86D44B07A8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_7C918866B37275DF34698E86D44B07A8" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_7C918866B37275DF34698E86D44B07A8" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_20004C1CDC6443B81F608E86D44CA377_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_20004C1CDC6443B81F608E86D44CA377" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_20004C1CDC6443B81F608E86D44CA377_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_20004C1CDC6443B81F608E86D44CA377" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, Payments, Due Year Two</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_20004C1CDC6443B81F608E86D44CA377" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_20004C1CDC6443B81F608E86D44CA377" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_20004C1CDC6443B81F608E86D44CA377" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_D0C706ED9E47520BE9E78E86D44CDA2F_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_D0C706ED9E47520BE9E78E86D44CDA2F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_D0C706ED9E47520BE9E78E86D44CDA2F_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_D0C706ED9E47520BE9E78E86D44CDA2F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, Payments, Due Year Three</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_D0C706ED9E47520BE9E78E86D44CDA2F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_D0C706ED9E47520BE9E78E86D44CDA2F" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_D0C706ED9E47520BE9E78E86D44CDA2F" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_C987CE4BC3576D08D8708E86D44C412F_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_C987CE4BC3576D08D8708E86D44C412F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2022</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_C987CE4BC3576D08D8708E86D44C412F_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_C987CE4BC3576D08D8708E86D44C412F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, Payments, Due Year Four</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_C987CE4BC3576D08D8708E86D44C412F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_C987CE4BC3576D08D8708E86D44C412F" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_C987CE4BC3576D08D8708E86D44C412F" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_45EE7F1EFFD36B35C6318E86D44C54B3_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_45EE7F1EFFD36B35C6318E86D44C54B3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2023</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_45EE7F1EFFD36B35C6318E86D44C54B3_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_45EE7F1EFFD36B35C6318E86D44C54B3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, Payments, Due Year Five</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_45EE7F1EFFD36B35C6318E86D44C54B3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_45EE7F1EFFD36B35C6318E86D44C54B3" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_45EE7F1EFFD36B35C6318E86D44C54B3" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_0BC6DDD9CB29F12D22828E86D4520511_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_0BC6DDD9CB29F12D22828E86D4520511" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Thereafter</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_0BC6DDD9CB29F12D22828E86D4520511_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_0BC6DDD9CB29F12D22828E86D4520511" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, Payments, Due after Year Five</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_0BC6DDD9CB29F12D22828E86D4520511" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_0BC6DDD9CB29F12D22828E86D4520511" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_0BC6DDD9CB29F12D22828E86D4520511" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_7866AE83818D6001694B8E86D45249F2_totalLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_7866AE83818D6001694B8E86D45249F2" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total future lease payments</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_7866AE83818D6001694B8E86D45249F2_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_7866AE83818D6001694B8E86D45249F2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, Payments, Due</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_7866AE83818D6001694B8E86D45249F2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_7866AE83818D6001694B8E86D45249F2" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_7866AE83818D6001694B8E86D45249F2" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_0C6CA9C8565D7E08B68A8E86D452D19C_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_0C6CA9C8565D7E08B68A8E86D452D19C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Less: Imputed interest</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_0C6CA9C8565D7E08B68A8E86D452D19C_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_0C6CA9C8565D7E08B68A8E86D452D19C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, Undiscounted Excess Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_0C6CA9C8565D7E08B68A8E86D452D19C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_0C6CA9C8565D7E08B68A8E86D452D19C" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_0C6CA9C8565D7E08B68A8E86D452D19C" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseLiability_751A0BACD0F89A5DB56A8E86D452692A_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiability_751A0BACD0F89A5DB56A8E86D452692A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Present value of future lease payments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_751A0BACD0F89A5DB56A8E86D452692A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLiability_751A0BACD0F89A5DB56A8E86D452692A" xlink:to="lab_us-gaap_OperatingLeaseLiability_751A0BACD0F89A5DB56A8E86D452692A" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_E47E722D22BA18A68A3B8E86D452191A_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_E47E722D22BA18A68A3B8E86D452191A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finance Leases</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_E47E722D22BA18A68A3B8E86D452191A_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_E47E722D22BA18A68A3B8E86D452191A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease Liabilities, Payments, Due [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract" xlink:label="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_E47E722D22BA18A68A3B8E86D452191A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_E47E722D22BA18A68A3B8E86D452191A" xlink:to="lab_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_E47E722D22BA18A68A3B8E86D452191A" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear_15489F1A4FE9589B57928E86D4531DAC_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear_15489F1A4FE9589B57928E86D4531DAC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019 (excluding the three months ended March 31, 2019)</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear_15489F1A4FE9589B57928E86D4531DAC_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear_15489F1A4FE9589B57928E86D4531DAC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Payments, Remainder of Fiscal Year</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear_15489F1A4FE9589B57928E86D4531DAC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear_15489F1A4FE9589B57928E86D4531DAC" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear_15489F1A4FE9589B57928E86D4531DAC" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_3CFC5E7495036427F4608E86D4538D71_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_3CFC5E7495036427F4608E86D4538D71" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_3CFC5E7495036427F4608E86D4538D71_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_3CFC5E7495036427F4608E86D4538D71" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Payments, Due Year Two</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_3CFC5E7495036427F4608E86D4538D71" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_3CFC5E7495036427F4608E86D4538D71" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_3CFC5E7495036427F4608E86D4538D71" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_9E474593BB10A7E4ACE88E86D453FA83_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_9E474593BB10A7E4ACE88E86D453FA83" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_9E474593BB10A7E4ACE88E86D453FA83_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_9E474593BB10A7E4ACE88E86D453FA83" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Payments, Due Year Three</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_9E474593BB10A7E4ACE88E86D453FA83" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_9E474593BB10A7E4ACE88E86D453FA83" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_9E474593BB10A7E4ACE88E86D453FA83" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_5C362349F53144D9F8778E86D453FD0E_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_5C362349F53144D9F8778E86D453FD0E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2022</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_5C362349F53144D9F8778E86D453FD0E_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_5C362349F53144D9F8778E86D453FD0E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Payments, Due Year Four</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_5C362349F53144D9F8778E86D453FD0E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_5C362349F53144D9F8778E86D453FD0E" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_5C362349F53144D9F8778E86D453FD0E" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_B27126DCEE2A4E2930C48E86D453943C_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_B27126DCEE2A4E2930C48E86D453943C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2023</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_B27126DCEE2A4E2930C48E86D453943C_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_B27126DCEE2A4E2930C48E86D453943C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Payments, Due Year Five</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_B27126DCEE2A4E2930C48E86D453943C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_B27126DCEE2A4E2930C48E86D453943C" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_B27126DCEE2A4E2930C48E86D453943C" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_BC10FB43A956990B6F7B8E86D4536222_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_BC10FB43A956990B6F7B8E86D4536222" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Thereafter</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_BC10FB43A956990B6F7B8E86D4536222_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_BC10FB43A956990B6F7B8E86D4536222" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Payments, Due after Year Five</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_BC10FB43A956990B6F7B8E86D4536222" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_BC10FB43A956990B6F7B8E86D4536222" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_BC10FB43A956990B6F7B8E86D4536222" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_125B46523CF59C312D008E86D4549D05_totalLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_125B46523CF59C312D008E86D4549D05" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total future lease payments</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_125B46523CF59C312D008E86D4549D05_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_125B46523CF59C312D008E86D4549D05" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Payments, Due</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_125B46523CF59C312D008E86D4549D05" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_125B46523CF59C312D008E86D4549D05" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_125B46523CF59C312D008E86D4549D05" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_AEDD3D1AAC2E779ABCAF8E86D454B036_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_AEDD3D1AAC2E779ABCAF8E86D454B036" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Less: Imputed interest</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_AEDD3D1AAC2E779ABCAF8E86D454B036_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_AEDD3D1AAC2E779ABCAF8E86D454B036" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Undiscounted Excess Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount" xlink:label="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_AEDD3D1AAC2E779ABCAF8E86D454B036" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_AEDD3D1AAC2E779ABCAF8E86D454B036" xlink:to="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_AEDD3D1AAC2E779ABCAF8E86D454B036" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiability_E1CF3754D4295DEDBF848E86D4548A95_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiability_E1CF3754D4295DEDBF848E86D4548A95" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Present value of future lease payments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseLiability" xlink:label="loc_us-gaap_FinanceLeaseLiability_E1CF3754D4295DEDBF848E86D4548A95" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiability_E1CF3754D4295DEDBF848E86D4548A95" xlink:to="lab_us-gaap_FinanceLeaseLiability_E1CF3754D4295DEDBF848E86D4548A95" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentTable_BE76F326AEF298AC82647A57D5241418_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentTable_BE76F326AEF298AC82647A57D5241418" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Long-term Debt Instruments [Table]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentTable_BE76F326AEF298AC82647A57D5241418_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentTable_BE76F326AEF298AC82647A57D5241418" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Long-term Debt Instruments [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_BE76F326AEF298AC82647A57D5241418" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentTable_BE76F326AEF298AC82647A57D5241418" xlink:to="lab_us-gaap_DebtInstrumentTable_BE76F326AEF298AC82647A57D5241418" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongtermDebtTypeAxis_6BBF2E4ADDB426B0E8137A57D5240F1F_terseLabel_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeAxis_6BBF2E4ADDB426B0E8137A57D5240F1F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term Debt, Type [Axis]</link:label>
    <link:label id="lab_us-gaap_LongtermDebtTypeAxis_6BBF2E4ADDB426B0E8137A57D5240F1F_label_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeAxis_6BBF2E4ADDB426B0E8137A57D5240F1F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Type [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_6BBF2E4ADDB426B0E8137A57D5240F1F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_6BBF2E4ADDB426B0E8137A57D5240F1F" xlink:to="lab_us-gaap_LongtermDebtTypeAxis_6BBF2E4ADDB426B0E8137A57D5240F1F" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongtermDebtTypeDomain_A62647745C734E87A8AF7A57D524F470_terseLabel_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeDomain_A62647745C734E87A8AF7A57D524F470" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term Debt, Type [Domain]</link:label>
    <link:label id="lab_us-gaap_LongtermDebtTypeDomain_A62647745C734E87A8AF7A57D524F470_label_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeDomain_A62647745C734E87A8AF7A57D524F470" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Type [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_A62647745C734E87A8AF7A57D524F470" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_A62647745C734E87A8AF7A57D524F470" xlink:to="lab_us-gaap_LongtermDebtTypeDomain_A62647745C734E87A8AF7A57D524F470" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditMember_CD56ED7FEAC17CC6DAAB7A57D5251183_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditMember_CD56ED7FEAC17CC6DAAB7A57D5251183" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Credit Facility</link:label>
    <link:label id="lab_us-gaap_LineOfCreditMember_CD56ED7FEAC17CC6DAAB7A57D5251183_label_en-US" xlink:label="lab_us-gaap_LineOfCreditMember_CD56ED7FEAC17CC6DAAB7A57D5251183" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditMember" xlink:label="loc_us-gaap_LineOfCreditMember_CD56ED7FEAC17CC6DAAB7A57D5251183" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditMember_CD56ED7FEAC17CC6DAAB7A57D5251183" xlink:to="lab_us-gaap_LineOfCreditMember_CD56ED7FEAC17CC6DAAB7A57D5251183" xlink:type="arc" />
    <link:label id="lab_us-gaap_UnsecuredDebtMember_F77A70F1669F56A107297A57D5258348_terseLabel_en-US" xlink:label="lab_us-gaap_UnsecuredDebtMember_F77A70F1669F56A107297A57D5258348" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Senior Notes</link:label>
    <link:label id="lab_us-gaap_UnsecuredDebtMember_F77A70F1669F56A107297A57D5258348_label_en-US" xlink:label="lab_us-gaap_UnsecuredDebtMember_F77A70F1669F56A107297A57D5258348" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unsecured Debt [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_UnsecuredDebtMember" xlink:label="loc_us-gaap_UnsecuredDebtMember_F77A70F1669F56A107297A57D5258348" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnsecuredDebtMember_F77A70F1669F56A107297A57D5258348" xlink:to="lab_us-gaap_UnsecuredDebtMember_F77A70F1669F56A107297A57D5258348" xlink:type="arc" />
    <link:label id="lab_us-gaap_CreditFacilityAxis_FE4E2D6917C76545CAD67A57D525DB1A_terseLabel_en-US" xlink:label="lab_us-gaap_CreditFacilityAxis_FE4E2D6917C76545CAD67A57D525DB1A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Credit Facility [Axis]</link:label>
    <link:label id="lab_us-gaap_CreditFacilityAxis_FE4E2D6917C76545CAD67A57D525DB1A_label_en-US" xlink:label="lab_us-gaap_CreditFacilityAxis_FE4E2D6917C76545CAD67A57D525DB1A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Credit Facility [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_FE4E2D6917C76545CAD67A57D525DB1A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CreditFacilityAxis_FE4E2D6917C76545CAD67A57D525DB1A" xlink:to="lab_us-gaap_CreditFacilityAxis_FE4E2D6917C76545CAD67A57D525DB1A" xlink:type="arc" />
    <link:label id="lab_us-gaap_CreditFacilityDomain_E7A0F058E928C551427B7A57D5258D4F_terseLabel_en-US" xlink:label="lab_us-gaap_CreditFacilityDomain_E7A0F058E928C551427B7A57D5258D4F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Credit Facility [Domain]</link:label>
    <link:label id="lab_us-gaap_CreditFacilityDomain_E7A0F058E928C551427B7A57D5258D4F_label_en-US" xlink:label="lab_us-gaap_CreditFacilityDomain_E7A0F058E928C551427B7A57D5258D4F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Credit Facility [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_E7A0F058E928C551427B7A57D5258D4F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CreditFacilityDomain_E7A0F058E928C551427B7A57D5258D4F" xlink:to="lab_us-gaap_CreditFacilityDomain_E7A0F058E928C551427B7A57D5258D4F" xlink:type="arc" />
    <link:label id="lab_us-gaap_RevolvingCreditFacilityMember_7C82A6D70E01E079FA487A57D5264D09_terseLabel_en-US" xlink:label="lab_us-gaap_RevolvingCreditFacilityMember_7C82A6D70E01E079FA487A57D5264D09" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revolving Credit Facility</link:label>
    <link:label id="lab_us-gaap_RevolvingCreditFacilityMember_7C82A6D70E01E079FA487A57D5264D09_label_en-US" xlink:label="lab_us-gaap_RevolvingCreditFacilityMember_7C82A6D70E01E079FA487A57D5264D09" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revolving Credit Facility [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_7C82A6D70E01E079FA487A57D5264D09" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevolvingCreditFacilityMember_7C82A6D70E01E079FA487A57D5264D09" xlink:to="lab_us-gaap_RevolvingCreditFacilityMember_7C82A6D70E01E079FA487A57D5264D09" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentAxis_810917EB128D144D16047A57D5274F17_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentAxis_810917EB128D144D16047A57D5274F17" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument [Axis]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentAxis_810917EB128D144D16047A57D5274F17_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentAxis_810917EB128D144D16047A57D5274F17" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_810917EB128D144D16047A57D5274F17" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentAxis_810917EB128D144D16047A57D5274F17" xlink:to="lab_us-gaap_DebtInstrumentAxis_810917EB128D144D16047A57D5274F17" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentNameDomain_4BEC935F050EF62E95A87A57D527119D_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentNameDomain_4BEC935F050EF62E95A87A57D527119D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Name [Domain]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentNameDomain_4BEC935F050EF62E95A87A57D527119D_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentNameDomain_4BEC935F050EF62E95A87A57D527119D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Name [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_4BEC935F050EF62E95A87A57D527119D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_4BEC935F050EF62E95A87A57D527119D" xlink:to="lab_us-gaap_DebtInstrumentNameDomain_4BEC935F050EF62E95A87A57D527119D" xlink:type="arc" />
    <link:label id="lab_oas_SeniorSecuredRevolvingLineofCreditMember_4B6F198182D093214E827A57D528AB3D_terseLabel_en-US" xlink:label="lab_oas_SeniorSecuredRevolvingLineofCreditMember_4B6F198182D093214E827A57D528AB3D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Oasis Credit Facility</link:label>
    <link:label id="lab_oas_SeniorSecuredRevolvingLineofCreditMember_4B6F198182D093214E827A57D528AB3D_label_en-US" xlink:label="lab_oas_SeniorSecuredRevolvingLineofCreditMember_4B6F198182D093214E827A57D528AB3D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Senior Secured Revolving Line of Credit [Member]</link:label>
    <link:label id="lab_oas_SeniorSecuredRevolvingLineofCreditMember_4B6F198182D093214E827A57D528AB3D_documentation_en-US" xlink:label="lab_oas_SeniorSecuredRevolvingLineofCreditMember_4B6F198182D093214E827A57D528AB3D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Senior Secured Revolving Line of Credit [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_SeniorSecuredRevolvingLineofCreditMember" xlink:label="loc_oas_SeniorSecuredRevolvingLineofCreditMember_4B6F198182D093214E827A57D528AB3D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_SeniorSecuredRevolvingLineofCreditMember_4B6F198182D093214E827A57D528AB3D" xlink:to="lab_oas_SeniorSecuredRevolvingLineofCreditMember_4B6F198182D093214E827A57D528AB3D" xlink:type="arc" />
    <link:label id="lab_oas_OMPRevolvingLineofCreditMember_1F283970316BF7676CF47A57D528F48C_terseLabel_en-US" xlink:label="lab_oas_OMPRevolvingLineofCreditMember_1F283970316BF7676CF47A57D528F48C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">OMP Credit Facility</link:label>
    <link:label id="lab_oas_OMPRevolvingLineofCreditMember_1F283970316BF7676CF47A57D528F48C_label_en-US" xlink:label="lab_oas_OMPRevolvingLineofCreditMember_1F283970316BF7676CF47A57D528F48C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">OMP Revolving Line of Credit [Member]</link:label>
    <link:label id="lab_oas_OMPRevolvingLineofCreditMember_1F283970316BF7676CF47A57D528F48C_documentation_en-US" xlink:label="lab_oas_OMPRevolvingLineofCreditMember_1F283970316BF7676CF47A57D528F48C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">OMP Revolving Line of Credit [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_OMPRevolvingLineofCreditMember" xlink:label="loc_oas_OMPRevolvingLineofCreditMember_1F283970316BF7676CF47A57D528F48C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_OMPRevolvingLineofCreditMember_1F283970316BF7676CF47A57D528F48C" xlink:to="lab_oas_OMPRevolvingLineofCreditMember_1F283970316BF7676CF47A57D528F48C" xlink:type="arc" />
    <link:label id="lab_oas_TwoThousandTwentyOneNotesMember_E301397C6CCF90A1DFC97A57D528DD5F_terseLabel_en-US" xlink:label="lab_oas_TwoThousandTwentyOneNotesMember_E301397C6CCF90A1DFC97A57D528DD5F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6.50% senior unsecured notes due November 1, 2021</link:label>
    <link:label id="lab_oas_TwoThousandTwentyOneNotesMember_E301397C6CCF90A1DFC97A57D528DD5F_label_en-US" xlink:label="lab_oas_TwoThousandTwentyOneNotesMember_E301397C6CCF90A1DFC97A57D528DD5F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Thousand Twenty One Notes [Member]</link:label>
    <link:label id="lab_oas_TwoThousandTwentyOneNotesMember_E301397C6CCF90A1DFC97A57D528DD5F_documentation_en-US" xlink:label="lab_oas_TwoThousandTwentyOneNotesMember_E301397C6CCF90A1DFC97A57D528DD5F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Thousand Twenty One Notes [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_TwoThousandTwentyOneNotesMember" xlink:label="loc_oas_TwoThousandTwentyOneNotesMember_E301397C6CCF90A1DFC97A57D528DD5F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_TwoThousandTwentyOneNotesMember_E301397C6CCF90A1DFC97A57D528DD5F" xlink:to="lab_oas_TwoThousandTwentyOneNotesMember_E301397C6CCF90A1DFC97A57D528DD5F" xlink:type="arc" />
    <link:label id="lab_oas_TwoThousandTwentyTwoNotesMember_DD4C2422C4CAF7958BB97A57D529804F_terseLabel_en-US" xlink:label="lab_oas_TwoThousandTwentyTwoNotesMember_DD4C2422C4CAF7958BB97A57D529804F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6.875% senior unsecured notes due March 15, 2022</link:label>
    <link:label id="lab_oas_TwoThousandTwentyTwoNotesMember_DD4C2422C4CAF7958BB97A57D529804F_label_en-US" xlink:label="lab_oas_TwoThousandTwentyTwoNotesMember_DD4C2422C4CAF7958BB97A57D529804F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Thousand Twenty Two Notes [Member]</link:label>
    <link:label id="lab_oas_TwoThousandTwentyTwoNotesMember_DD4C2422C4CAF7958BB97A57D529804F_documentation_en-US" xlink:label="lab_oas_TwoThousandTwentyTwoNotesMember_DD4C2422C4CAF7958BB97A57D529804F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Thousand Twenty Two Notes [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_TwoThousandTwentyTwoNotesMember" xlink:label="loc_oas_TwoThousandTwentyTwoNotesMember_DD4C2422C4CAF7958BB97A57D529804F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_TwoThousandTwentyTwoNotesMember_DD4C2422C4CAF7958BB97A57D529804F" xlink:to="lab_oas_TwoThousandTwentyTwoNotesMember_DD4C2422C4CAF7958BB97A57D529804F" xlink:type="arc" />
    <link:label id="lab_oas_TwoThousandTwentyThreeNotesMember_477F045BDD43EC71B1707A57D52905EC_terseLabel_en-US" xlink:label="lab_oas_TwoThousandTwentyThreeNotesMember_477F045BDD43EC71B1707A57D52905EC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6.875% senior unsecured notes due January 15, 2023</link:label>
    <link:label id="lab_oas_TwoThousandTwentyThreeNotesMember_477F045BDD43EC71B1707A57D52905EC_label_en-US" xlink:label="lab_oas_TwoThousandTwentyThreeNotesMember_477F045BDD43EC71B1707A57D52905EC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Thousand Twenty Three Notes [Member]</link:label>
    <link:label id="lab_oas_TwoThousandTwentyThreeNotesMember_477F045BDD43EC71B1707A57D52905EC_documentation_en-US" xlink:label="lab_oas_TwoThousandTwentyThreeNotesMember_477F045BDD43EC71B1707A57D52905EC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Thousand Twenty Three Notes [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_TwoThousandTwentyThreeNotesMember" xlink:label="loc_oas_TwoThousandTwentyThreeNotesMember_477F045BDD43EC71B1707A57D52905EC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_TwoThousandTwentyThreeNotesMember_477F045BDD43EC71B1707A57D52905EC" xlink:to="lab_oas_TwoThousandTwentyThreeNotesMember_477F045BDD43EC71B1707A57D52905EC" xlink:type="arc" />
    <link:label id="lab_oas_A6.25PercentSeniorNotesDueMay2026Member_C3F62FEEBF20217DE34E7A57D52991D2_terseLabel_en-US" xlink:label="lab_oas_A6.25PercentSeniorNotesDueMay2026Member_C3F62FEEBF20217DE34E7A57D52991D2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6.25% senior unsecured notes due May 1, 2026</link:label>
    <link:label id="lab_oas_A6.25PercentSeniorNotesDueMay2026Member_C3F62FEEBF20217DE34E7A57D52991D2_label_en-US" xlink:label="lab_oas_A6.25PercentSeniorNotesDueMay2026Member_C3F62FEEBF20217DE34E7A57D52991D2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">6.25 Percent Senior Notes Due May 2026 [Member]</link:label>
    <link:label id="lab_oas_A6.25PercentSeniorNotesDueMay2026Member_C3F62FEEBF20217DE34E7A57D52991D2_documentation_en-US" xlink:label="lab_oas_A6.25PercentSeniorNotesDueMay2026Member_C3F62FEEBF20217DE34E7A57D52991D2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">6.25 Percent Senior Notes Due May 2026 [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_A6.25PercentSeniorNotesDueMay2026Member" xlink:label="loc_oas_A6.25PercentSeniorNotesDueMay2026Member_C3F62FEEBF20217DE34E7A57D52991D2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_A6.25PercentSeniorNotesDueMay2026Member_C3F62FEEBF20217DE34E7A57D52991D2" xlink:to="lab_oas_A6.25PercentSeniorNotesDueMay2026Member_C3F62FEEBF20217DE34E7A57D52991D2" xlink:type="arc" />
    <link:label id="lab_oas_A2.625PercentSeniorNotesDueSeptember2023Member_8E5D398AFF25FE06CE9C7A57D52A87EB_terseLabel_en-US" xlink:label="lab_oas_A2.625PercentSeniorNotesDueSeptember2023Member_8E5D398AFF25FE06CE9C7A57D52A87EB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2.625% senior unsecured convertible notes due September 15, 2023</link:label>
    <link:label id="lab_oas_A2.625PercentSeniorNotesDueSeptember2023Member_8E5D398AFF25FE06CE9C7A57D52A87EB_label_en-US" xlink:label="lab_oas_A2.625PercentSeniorNotesDueSeptember2023Member_8E5D398AFF25FE06CE9C7A57D52A87EB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">2.625 Percent Senior Notes Due September 2023 [Member]</link:label>
    <link:label id="lab_oas_A2.625PercentSeniorNotesDueSeptember2023Member_8E5D398AFF25FE06CE9C7A57D52A87EB_documentation_en-US" xlink:label="lab_oas_A2.625PercentSeniorNotesDueSeptember2023Member_8E5D398AFF25FE06CE9C7A57D52A87EB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">2.625 Percent Senior Notes Due September 2023 [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_A2.625PercentSeniorNotesDueSeptember2023Member" xlink:label="loc_oas_A2.625PercentSeniorNotesDueSeptember2023Member_8E5D398AFF25FE06CE9C7A57D52A87EB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_A2.625PercentSeniorNotesDueSeptember2023Member_8E5D398AFF25FE06CE9C7A57D52A87EB" xlink:to="lab_oas_A2.625PercentSeniorNotesDueSeptember2023Member_8E5D398AFF25FE06CE9C7A57D52A87EB" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentLineItems_3272E3FF0991E40F33507A57D52AB33F_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_3272E3FF0991E40F33507A57D52AB33F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument [Line Items]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentLineItems_3272E3FF0991E40F33507A57D52AB33F_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_3272E3FF0991E40F33507A57D52AB33F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_3272E3FF0991E40F33507A57D52AB33F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3272E3FF0991E40F33507A57D52AB33F" xlink:to="lab_us-gaap_DebtInstrumentLineItems_3272E3FF0991E40F33507A57D52AB33F" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_276FC7CF5972124E57FA7A57D52A891C_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_276FC7CF5972124E57FA7A57D52A891C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stated interest rate (as percent)</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_276FC7CF5972124E57FA7A57D52A891C_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_276FC7CF5972124E57FA7A57D52A891C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Interest Rate, Stated Percentage</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_276FC7CF5972124E57FA7A57D52A891C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_276FC7CF5972124E57FA7A57D52A891C" xlink:to="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_276FC7CF5972124E57FA7A57D52A891C" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_3989B16D62786F4B63817A57D52A2EF4_verboseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount_3989B16D62786F4B63817A57D52A2EF4" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Total principal of senior unsecured notes and revolving line of credit</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_3989B16D62786F4B63817A57D52A2EF4_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount_3989B16D62786F4B63817A57D52A2EF4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_3989B16D62786F4B63817A57D52A2EF4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentCarryingAmount_3989B16D62786F4B63817A57D52A2EF4" xlink:to="lab_us-gaap_DebtInstrumentCarryingAmount_3989B16D62786F4B63817A57D52A2EF4" xlink:type="arc" />
    <link:label id="lab_us-gaap_DeferredFinanceCostsNet_9116D8E330F3CB5125B47A57D52B05EC_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DeferredFinanceCostsNet_9116D8E330F3CB5125B47A57D52B05EC" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Less: unamortized deferred financing costs on senior unsecured notes</link:label>
    <link:label id="lab_us-gaap_DeferredFinanceCostsNet_9116D8E330F3CB5125B47A57D52B05EC_label_en-US" xlink:label="lab_us-gaap_DeferredFinanceCostsNet_9116D8E330F3CB5125B47A57D52B05EC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Issuance Costs, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredFinanceCostsNet" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_9116D8E330F3CB5125B47A57D52B05EC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredFinanceCostsNet_9116D8E330F3CB5125B47A57D52B05EC" xlink:to="lab_us-gaap_DeferredFinanceCostsNet_9116D8E330F3CB5125B47A57D52B05EC" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentUnamortizedDiscount_3575F9287213D0A4DF5E7A57D52B582D_negatedLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentUnamortizedDiscount_3575F9287213D0A4DF5E7A57D52B582D" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Less: unamortized debt discount on senior unsecured convertible notes</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentUnamortizedDiscount_3575F9287213D0A4DF5E7A57D52B582D_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentUnamortizedDiscount_3575F9287213D0A4DF5E7A57D52B582D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Unamortized Discount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscount" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_3575F9287213D0A4DF5E7A57D52B582D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentUnamortizedDiscount_3575F9287213D0A4DF5E7A57D52B582D" xlink:to="lab_us-gaap_DebtInstrumentUnamortizedDiscount_3575F9287213D0A4DF5E7A57D52B582D" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongTermDebt_02A889635693665D55AB7A57D52B60BC_totalLabel_en-US" xlink:label="lab_us-gaap_LongTermDebt_02A889635693665D55AB7A57D52B60BC" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total long-term debt</link:label>
    <link:label id="lab_us-gaap_LongTermDebt_02A889635693665D55AB7A57D52B60BC_label_en-US" xlink:label="lab_us-gaap_LongTermDebt_02A889635693665D55AB7A57D52B60BC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_02A889635693665D55AB7A57D52B60BC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebt_02A889635693665D55AB7A57D52B60BC" xlink:to="lab_us-gaap_LongTermDebt_02A889635693665D55AB7A57D52B60BC" xlink:type="arc" />
    <link:label id="lab_oas_OMPOperatingLLCMember_F221EC66D59D928EA1F47A57D500A3DF_terseLabel_en-US" xlink:label="lab_oas_OMPOperatingLLCMember_F221EC66D59D928EA1F47A57D500A3DF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">OMP Operating, LLC</link:label>
    <link:label id="lab_oas_OMPOperatingLLCMember_F221EC66D59D928EA1F47A57D500A3DF_label_en-US" xlink:label="lab_oas_OMPOperatingLLCMember_F221EC66D59D928EA1F47A57D500A3DF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">OMP Operating, LLC [Member]</link:label>
    <link:label id="lab_oas_OMPOperatingLLCMember_F221EC66D59D928EA1F47A57D500A3DF_documentation_en-US" xlink:label="lab_oas_OMPOperatingLLCMember_F221EC66D59D928EA1F47A57D500A3DF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">OMP Operating, LLC [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_OMPOperatingLLCMember" xlink:label="loc_oas_OMPOperatingLLCMember_F221EC66D59D928EA1F47A57D500A3DF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_OMPOperatingLLCMember_F221EC66D59D928EA1F47A57D500A3DF" xlink:to="lab_oas_OMPOperatingLLCMember_F221EC66D59D928EA1F47A57D500A3DF" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodAxis_895CA3503DCFC1981D1D7A57D5009BF4_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodAxis_895CA3503DCFC1981D1D7A57D5009BF4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Redemption, Period [Axis]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodAxis_895CA3503DCFC1981D1D7A57D5009BF4_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodAxis_895CA3503DCFC1981D1D7A57D5009BF4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Redemption, Period [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodAxis" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_895CA3503DCFC1981D1D7A57D5009BF4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_895CA3503DCFC1981D1D7A57D5009BF4" xlink:to="lab_us-gaap_DebtInstrumentRedemptionPeriodAxis_895CA3503DCFC1981D1D7A57D5009BF4" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodDomain_2B7D971DE6FF97EF2C927A57D500DCC3_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodDomain_2B7D971DE6FF97EF2C927A57D500DCC3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Redemption, Period [Domain]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodDomain_2B7D971DE6FF97EF2C927A57D500DCC3_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodDomain_2B7D971DE6FF97EF2C927A57D500DCC3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Redemption, Period [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_2B7D971DE6FF97EF2C927A57D500DCC3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_2B7D971DE6FF97EF2C927A57D500DCC3" xlink:to="lab_us-gaap_DebtInstrumentRedemptionPeriodDomain_2B7D971DE6FF97EF2C927A57D500DCC3" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodOneMember_A0031B1BF13957978A2D7A57D501B90D_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodOneMember_A0031B1BF13957978A2D7A57D501B90D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Conversion Scenario 1</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodOneMember_A0031B1BF13957978A2D7A57D501B90D_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodOneMember_A0031B1BF13957978A2D7A57D501B90D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Redemption, Period One [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodOneMember" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_A0031B1BF13957978A2D7A57D501B90D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_A0031B1BF13957978A2D7A57D501B90D" xlink:to="lab_us-gaap_DebtInstrumentRedemptionPeriodOneMember_A0031B1BF13957978A2D7A57D501B90D" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_A82B4CEFDE57594346467A57D501B8A7_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_A82B4CEFDE57594346467A57D501B8A7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Conversion Scenario 2</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_A82B4CEFDE57594346467A57D501B8A7_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_A82B4CEFDE57594346467A57D501B8A7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Redemption, Period Two [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodTwoMember" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_A82B4CEFDE57594346467A57D501B8A7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_A82B4CEFDE57594346467A57D501B8A7" xlink:to="lab_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_A82B4CEFDE57594346467A57D501B8A7" xlink:type="arc" />
    <link:label id="lab_oas_SwinglineLoanMember_FA68ADBE9822DBA6D6517A7176A672A4_terseLabel_en-US" xlink:label="lab_oas_SwinglineLoanMember_FA68ADBE9822DBA6D6517A7176A672A4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Swingline Loan</link:label>
    <link:label id="lab_oas_SwinglineLoanMember_FA68ADBE9822DBA6D6517A7176A672A4_label_en-US" xlink:label="lab_oas_SwinglineLoanMember_FA68ADBE9822DBA6D6517A7176A672A4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Swingline Loan [Member]</link:label>
    <link:label id="lab_oas_SwinglineLoanMember_FA68ADBE9822DBA6D6517A7176A672A4_documentation_en-US" xlink:label="lab_oas_SwinglineLoanMember_FA68ADBE9822DBA6D6517A7176A672A4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Swingline Loan [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_SwinglineLoanMember" xlink:label="loc_oas_SwinglineLoanMember_FA68ADBE9822DBA6D6517A7176A672A4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_SwinglineLoanMember_FA68ADBE9822DBA6D6517A7176A672A4" xlink:to="lab_oas_SwinglineLoanMember_FA68ADBE9822DBA6D6517A7176A672A4" xlink:type="arc" />
    <link:label id="lab_oas_ABRLoansMember_EA7CFB94D937EA6395C47A57D502CCBF_terseLabel_en-US" xlink:label="lab_oas_ABRLoansMember_EA7CFB94D937EA6395C47A57D502CCBF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABR Loans</link:label>
    <link:label id="lab_oas_ABRLoansMember_EA7CFB94D937EA6395C47A57D502CCBF_label_en-US" xlink:label="lab_oas_ABRLoansMember_EA7CFB94D937EA6395C47A57D502CCBF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABR Loans [Member]</link:label>
    <link:label id="lab_oas_ABRLoansMember_EA7CFB94D937EA6395C47A57D502CCBF_documentation_en-US" xlink:label="lab_oas_ABRLoansMember_EA7CFB94D937EA6395C47A57D502CCBF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABR Loans [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_ABRLoansMember" xlink:label="loc_oas_ABRLoansMember_EA7CFB94D937EA6395C47A57D502CCBF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_ABRLoansMember_EA7CFB94D937EA6395C47A57D502CCBF" xlink:to="lab_oas_ABRLoansMember_EA7CFB94D937EA6395C47A57D502CCBF" xlink:type="arc" />
    <link:label id="lab_oas_EurodollarLoansMember_58611E6D0B29C224C5B17A57D50377CB_terseLabel_en-US" xlink:label="lab_oas_EurodollarLoansMember_58611E6D0B29C224C5B17A57D50377CB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Eurodollar Loans</link:label>
    <link:label id="lab_oas_EurodollarLoansMember_58611E6D0B29C224C5B17A57D50377CB_label_en-US" xlink:label="lab_oas_EurodollarLoansMember_58611E6D0B29C224C5B17A57D50377CB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eurodollar Loans [Member]</link:label>
    <link:label id="lab_oas_EurodollarLoansMember_58611E6D0B29C224C5B17A57D50377CB_documentation_en-US" xlink:label="lab_oas_EurodollarLoansMember_58611E6D0B29C224C5B17A57D50377CB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eurodollar Loans [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_EurodollarLoansMember" xlink:label="loc_oas_EurodollarLoansMember_58611E6D0B29C224C5B17A57D50377CB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_EurodollarLoansMember_58611E6D0B29C224C5B17A57D50377CB" xlink:to="lab_oas_EurodollarLoansMember_58611E6D0B29C224C5B17A57D50377CB" xlink:type="arc" />
    <link:label id="lab_oas_ABRLoansorSwinglineLoansMember_6EB166DBDFB5720576037A57D503C665_terseLabel_en-US" xlink:label="lab_oas_ABRLoansorSwinglineLoansMember_6EB166DBDFB5720576037A57D503C665" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABR Loans or Swingline Loans</link:label>
    <link:label id="lab_oas_ABRLoansorSwinglineLoansMember_6EB166DBDFB5720576037A57D503C665_label_en-US" xlink:label="lab_oas_ABRLoansorSwinglineLoansMember_6EB166DBDFB5720576037A57D503C665" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABR Loans or Swingline Loans [Member]</link:label>
    <link:label id="lab_oas_ABRLoansorSwinglineLoansMember_6EB166DBDFB5720576037A57D503C665_documentation_en-US" xlink:label="lab_oas_ABRLoansorSwinglineLoansMember_6EB166DBDFB5720576037A57D503C665" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABR Loans or Swingline Loans [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_ABRLoansorSwinglineLoansMember" xlink:label="loc_oas_ABRLoansorSwinglineLoansMember_6EB166DBDFB5720576037A57D503C665" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_ABRLoansorSwinglineLoansMember_6EB166DBDFB5720576037A57D503C665" xlink:to="lab_oas_ABRLoansorSwinglineLoansMember_6EB166DBDFB5720576037A57D503C665" xlink:type="arc" />
    <link:label id="lab_us-gaap_LetterOfCreditMember_D578AEBF0922B14602407A57D5049F97_terseLabel_en-US" xlink:label="lab_us-gaap_LetterOfCreditMember_D578AEBF0922B14602407A57D5049F97" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Letter of Credit</link:label>
    <link:label id="lab_us-gaap_LetterOfCreditMember_D578AEBF0922B14602407A57D5049F97_label_en-US" xlink:label="lab_us-gaap_LetterOfCreditMember_D578AEBF0922B14602407A57D5049F97" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Letter of Credit [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LetterOfCreditMember" xlink:label="loc_us-gaap_LetterOfCreditMember_D578AEBF0922B14602407A57D5049F97" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LetterOfCreditMember_D578AEBF0922B14602407A57D5049F97" xlink:to="lab_us-gaap_LetterOfCreditMember_D578AEBF0922B14602407A57D5049F97" xlink:type="arc" />
    <link:label id="lab_us-gaap_BridgeLoanMember_3BB8E951BD4ABF89AD077A57D5047C7A_terseLabel_en-US" xlink:label="lab_us-gaap_BridgeLoanMember_3BB8E951BD4ABF89AD077A57D5047C7A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Swingline Loan</link:label>
    <link:label id="lab_us-gaap_BridgeLoanMember_3BB8E951BD4ABF89AD077A57D5047C7A_label_en-US" xlink:label="lab_us-gaap_BridgeLoanMember_3BB8E951BD4ABF89AD077A57D5047C7A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Bridge Loan [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BridgeLoanMember" xlink:label="loc_us-gaap_BridgeLoanMember_3BB8E951BD4ABF89AD077A57D5047C7A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BridgeLoanMember_3BB8E951BD4ABF89AD077A57D5047C7A" xlink:to="lab_us-gaap_BridgeLoanMember_3BB8E951BD4ABF89AD077A57D5047C7A" xlink:type="arc" />
    <link:label id="lab_us-gaap_VariableRateAxis_F9BC92D480620FC0BC627A57D504CD25_terseLabel_en-US" xlink:label="lab_us-gaap_VariableRateAxis_F9BC92D480620FC0BC627A57D504CD25" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Variable Rate [Axis]</link:label>
    <link:label id="lab_us-gaap_VariableRateAxis_F9BC92D480620FC0BC627A57D504CD25_label_en-US" xlink:label="lab_us-gaap_VariableRateAxis_F9BC92D480620FC0BC627A57D504CD25" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Rate [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableRateAxis" xlink:label="loc_us-gaap_VariableRateAxis_F9BC92D480620FC0BC627A57D504CD25" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableRateAxis_F9BC92D480620FC0BC627A57D504CD25" xlink:to="lab_us-gaap_VariableRateAxis_F9BC92D480620FC0BC627A57D504CD25" xlink:type="arc" />
    <link:label id="lab_us-gaap_VariableRateDomain_E616A183E3596A98993F7A57D504386D_terseLabel_en-US" xlink:label="lab_us-gaap_VariableRateDomain_E616A183E3596A98993F7A57D504386D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Variable Rate [Domain]</link:label>
    <link:label id="lab_us-gaap_VariableRateDomain_E616A183E3596A98993F7A57D504386D_label_en-US" xlink:label="lab_us-gaap_VariableRateDomain_E616A183E3596A98993F7A57D504386D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Rate [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_E616A183E3596A98993F7A57D504386D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableRateDomain_E616A183E3596A98993F7A57D504386D" xlink:to="lab_us-gaap_VariableRateDomain_E616A183E3596A98993F7A57D504386D" xlink:type="arc" />
    <link:label id="lab_us-gaap_FederalFundsEffectiveSwapRateMember_B2EBF36AC664025E82EE7A57D5069456_terseLabel_en-US" xlink:label="lab_us-gaap_FederalFundsEffectiveSwapRateMember_B2EBF36AC664025E82EE7A57D5069456" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Federal Funds Effective Swap Rate</link:label>
    <link:label id="lab_us-gaap_FederalFundsEffectiveSwapRateMember_B2EBF36AC664025E82EE7A57D5069456_label_en-US" xlink:label="lab_us-gaap_FederalFundsEffectiveSwapRateMember_B2EBF36AC664025E82EE7A57D5069456" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Federal Funds Effective Swap Rate [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FederalFundsEffectiveSwapRateMember" xlink:label="loc_us-gaap_FederalFundsEffectiveSwapRateMember_B2EBF36AC664025E82EE7A57D5069456" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FederalFundsEffectiveSwapRateMember_B2EBF36AC664025E82EE7A57D5069456" xlink:to="lab_us-gaap_FederalFundsEffectiveSwapRateMember_B2EBF36AC664025E82EE7A57D5069456" xlink:type="arc" />
    <link:label id="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_BEFEBE2F31CFC38715967A57D5070517_terseLabel_en-US" xlink:label="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_BEFEBE2F31CFC38715967A57D5070517" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">LIBOR</link:label>
    <link:label id="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_BEFEBE2F31CFC38715967A57D5070517_label_en-US" xlink:label="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_BEFEBE2F31CFC38715967A57D5070517" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">London Interbank Offered Rate (LIBOR) [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_BEFEBE2F31CFC38715967A57D5070517" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_BEFEBE2F31CFC38715967A57D5070517" xlink:to="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_BEFEBE2F31CFC38715967A57D5070517" xlink:type="arc" />
    <link:label id="lab_oas_TwoThousandTwentyTwoNotesandTwoThousandTwentyThreeNotesMember_695F07F007CF878106547A57D508034D_terseLabel_en-US" xlink:label="lab_oas_TwoThousandTwentyTwoNotesandTwoThousandTwentyThreeNotesMember_695F07F007CF878106547A57D508034D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2022 and 2023 Notes</link:label>
    <link:label id="lab_oas_TwoThousandTwentyTwoNotesandTwoThousandTwentyThreeNotesMember_695F07F007CF878106547A57D508034D_label_en-US" xlink:label="lab_oas_TwoThousandTwentyTwoNotesandTwoThousandTwentyThreeNotesMember_695F07F007CF878106547A57D508034D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Thousand Twenty Two Notes and Two Thousand Twenty Three Notes [Member]</link:label>
    <link:label id="lab_oas_TwoThousandTwentyTwoNotesandTwoThousandTwentyThreeNotesMember_695F07F007CF878106547A57D508034D_documentation_en-US" xlink:label="lab_oas_TwoThousandTwentyTwoNotesandTwoThousandTwentyThreeNotesMember_695F07F007CF878106547A57D508034D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Thousand Twenty Two Notes and Two Thousand Twenty Three Notes [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_TwoThousandTwentyTwoNotesandTwoThousandTwentyThreeNotesMember" xlink:label="loc_oas_TwoThousandTwentyTwoNotesandTwoThousandTwentyThreeNotesMember_695F07F007CF878106547A57D508034D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_TwoThousandTwentyTwoNotesandTwoThousandTwentyThreeNotesMember_695F07F007CF878106547A57D508034D" xlink:to="lab_oas_TwoThousandTwentyTwoNotesandTwoThousandTwentyThreeNotesMember_695F07F007CF878106547A57D508034D" xlink:type="arc" />
    <link:label id="lab_oas_UnsecuredSeniorNotesMember_5D3B4D2532FDB1F2CF287A57D5085EB3_terseLabel_en-US" xlink:label="lab_oas_UnsecuredSeniorNotesMember_5D3B4D2532FDB1F2CF287A57D5085EB3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unsecured Senior Notes</link:label>
    <link:label id="lab_oas_UnsecuredSeniorNotesMember_5D3B4D2532FDB1F2CF287A57D5085EB3_label_en-US" xlink:label="lab_oas_UnsecuredSeniorNotesMember_5D3B4D2532FDB1F2CF287A57D5085EB3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unsecured Senior Notes [Member]</link:label>
    <link:label id="lab_oas_UnsecuredSeniorNotesMember_5D3B4D2532FDB1F2CF287A57D5085EB3_documentation_en-US" xlink:label="lab_oas_UnsecuredSeniorNotesMember_5D3B4D2532FDB1F2CF287A57D5085EB3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Unsecured Senior Notes [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_UnsecuredSeniorNotesMember" xlink:label="loc_oas_UnsecuredSeniorNotesMember_5D3B4D2532FDB1F2CF287A57D5085EB3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_UnsecuredSeniorNotesMember_5D3B4D2532FDB1F2CF287A57D5085EB3" xlink:to="lab_oas_UnsecuredSeniorNotesMember_5D3B4D2532FDB1F2CF287A57D5085EB3" xlink:type="arc" />
    <link:label id="lab_oas_NotesMember_1C6A4E65A9A4836672167A57D509E978_terseLabel_en-US" xlink:label="lab_oas_NotesMember_1C6A4E65A9A4836672167A57D509E978" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Notes [Member]</link:label>
    <link:label id="lab_oas_NotesMember_1C6A4E65A9A4836672167A57D509E978_label_en-US" xlink:label="lab_oas_NotesMember_1C6A4E65A9A4836672167A57D509E978" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Notes [Member]</link:label>
    <link:label id="lab_oas_NotesMember_1C6A4E65A9A4836672167A57D509E978_documentation_en-US" xlink:label="lab_oas_NotesMember_1C6A4E65A9A4836672167A57D509E978" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Notes [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_NotesMember" xlink:label="loc_oas_NotesMember_1C6A4E65A9A4836672167A57D509E978" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_NotesMember_1C6A4E65A9A4836672167A57D509E978" xlink:to="lab_oas_NotesMember_1C6A4E65A9A4836672167A57D509E978" xlink:type="arc" />
    <link:label id="lab_oas_TheCreditAgreementMember_9D73E0008DB84FED98157A57D50A7705_terseLabel_en-US" xlink:label="lab_oas_TheCreditAgreementMember_9D73E0008DB84FED98157A57D50A7705" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">The Credit Agreement</link:label>
    <link:label id="lab_oas_TheCreditAgreementMember_9D73E0008DB84FED98157A57D50A7705_label_en-US" xlink:label="lab_oas_TheCreditAgreementMember_9D73E0008DB84FED98157A57D50A7705" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">The Credit Agreement [Member]</link:label>
    <link:label id="lab_oas_TheCreditAgreementMember_9D73E0008DB84FED98157A57D50A7705_documentation_en-US" xlink:label="lab_oas_TheCreditAgreementMember_9D73E0008DB84FED98157A57D50A7705" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The Credit Agreement [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_TheCreditAgreementMember" xlink:label="loc_oas_TheCreditAgreementMember_9D73E0008DB84FED98157A57D50A7705" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_TheCreditAgreementMember_9D73E0008DB84FED98157A57D50A7705" xlink:to="lab_oas_TheCreditAgreementMember_9D73E0008DB84FED98157A57D50A7705" xlink:type="arc" />
    <link:label id="lab_oas_AmendedCreditFacilityMember_4B024B5A3309BF1843017A57D50AC524_terseLabel_en-US" xlink:label="lab_oas_AmendedCreditFacilityMember_4B024B5A3309BF1843017A57D50AC524" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amended Credit Facility</link:label>
    <link:label id="lab_oas_AmendedCreditFacilityMember_4B024B5A3309BF1843017A57D50AC524_label_en-US" xlink:label="lab_oas_AmendedCreditFacilityMember_4B024B5A3309BF1843017A57D50AC524" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amended Credit Facility [Member]</link:label>
    <link:label id="lab_oas_AmendedCreditFacilityMember_4B024B5A3309BF1843017A57D50AC524_documentation_en-US" xlink:label="lab_oas_AmendedCreditFacilityMember_4B024B5A3309BF1843017A57D50AC524" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amended Credit Facility [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_AmendedCreditFacilityMember" xlink:label="loc_oas_AmendedCreditFacilityMember_4B024B5A3309BF1843017A57D50AC524" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_AmendedCreditFacilityMember_4B024B5A3309BF1843017A57D50AC524" xlink:to="lab_oas_AmendedCreditFacilityMember_4B024B5A3309BF1843017A57D50AC524" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongTermDebt_D92D468577D387EC68B07A57D50C722C_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebt_D92D468577D387EC68B07A57D50C722C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total long-term debt</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_D92D468577D387EC68B07A57D50C722C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebt_D92D468577D387EC68B07A57D50C722C" xlink:to="lab_us-gaap_LongTermDebt_D92D468577D387EC68B07A57D50C722C" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentUnamortizedDiscount_EF94FADF890DAD2D739F7A57D50C8F6B_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentUnamortizedDiscount_EF94FADF890DAD2D739F7A57D50C8F6B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt discount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscount" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_EF94FADF890DAD2D739F7A57D50C8F6B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentUnamortizedDiscount_EF94FADF890DAD2D739F7A57D50C8F6B" xlink:to="lab_us-gaap_DebtInstrumentUnamortizedDiscount_EF94FADF890DAD2D739F7A57D50C8F6B" xlink:type="arc" />
    <link:label id="lab_us-gaap_DeferredFinanceCostsNet_13B541328B11891228D47A57D50CE9EF_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredFinanceCostsNet_13B541328B11891228D47A57D50CE9EF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt issuance costs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredFinanceCostsNet" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_13B541328B11891228D47A57D50CE9EF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredFinanceCostsNet_13B541328B11891228D47A57D50CE9EF" xlink:to="lab_us-gaap_DeferredFinanceCostsNet_13B541328B11891228D47A57D50CE9EF" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_26FC074F05228AE937C97A57D50CF58F_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount_26FC074F05228AE937C97A57D50CF58F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term debt, gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_26FC074F05228AE937C97A57D50CF58F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentCarryingAmount_26FC074F05228AE937C97A57D50CF58F" xlink:to="lab_us-gaap_DebtInstrumentCarryingAmount_26FC074F05228AE937C97A57D50CF58F" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongTermDebtFairValue_631302BD2055037431F97A57D50D2026_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtFairValue_631302BD2055037431F97A57D50D2026" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term debt, fair value</link:label>
    <link:label id="lab_us-gaap_LongTermDebtFairValue_631302BD2055037431F97A57D50D2026_label_en-US" xlink:label="lab_us-gaap_LongTermDebtFairValue_631302BD2055037431F97A57D50D2026" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Fair Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtFairValue" xlink:label="loc_us-gaap_LongTermDebtFairValue_631302BD2055037431F97A57D50D2026" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtFairValue_631302BD2055037431F97A57D50D2026" xlink:to="lab_us-gaap_LongTermDebtFairValue_631302BD2055037431F97A57D50D2026" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_706CF2DE6F9AFEADADC97A57D50D73D7_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_706CF2DE6F9AFEADADC97A57D50D73D7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Line of credit facility amount</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_706CF2DE6F9AFEADADC97A57D50D73D7_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_706CF2DE6F9AFEADADC97A57D50D73D7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases" xlink:label="loc_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_706CF2DE6F9AFEADADC97A57D50D73D7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_706CF2DE6F9AFEADADC97A57D50D73D7" xlink:to="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_706CF2DE6F9AFEADADC97A57D50D73D7" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2688C58A5D93E2A47D057A57D50E41AB_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2688C58A5D93E2A47D057A57D50E41AB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Credit facility borrowing base</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2688C58A5D93E2A47D057A57D50E41AB_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2688C58A5D93E2A47D057A57D50E41AB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2688C58A5D93E2A47D057A57D50E41AB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2688C58A5D93E2A47D057A57D50E41AB" xlink:to="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2688C58A5D93E2A47D057A57D50E41AB" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_08B507D4AB01C2F9E7267A57D50E0790_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_08B507D4AB01C2F9E7267A57D50E0790" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Line of credit facility, current borrowing capacity</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_08B507D4AB01C2F9E7267A57D50E0790_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_08B507D4AB01C2F9E7267A57D50E0790" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Current Borrowing Capacity</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_08B507D4AB01C2F9E7267A57D50E0790" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_08B507D4AB01C2F9E7267A57D50E0790" xlink:to="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_08B507D4AB01C2F9E7267A57D50E0790" xlink:type="arc" />
    <link:label id="lab_oas_LineofCreditFacilityMaximumBorrowingCapacityAccordianFeature_A2528377BCB94829152A7A57D50E5550_terseLabel_en-US" xlink:label="lab_oas_LineofCreditFacilityMaximumBorrowingCapacityAccordianFeature_A2528377BCB94829152A7A57D50E5550" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum borrowing capacity subject to certain conditions</link:label>
    <link:label id="lab_oas_LineofCreditFacilityMaximumBorrowingCapacityAccordianFeature_A2528377BCB94829152A7A57D50E5550_label_en-US" xlink:label="lab_oas_LineofCreditFacilityMaximumBorrowingCapacityAccordianFeature_A2528377BCB94829152A7A57D50E5550" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity, Accordian Feature</link:label>
    <link:label id="lab_oas_LineofCreditFacilityMaximumBorrowingCapacityAccordianFeature_A2528377BCB94829152A7A57D50E5550_documentation_en-US" xlink:label="lab_oas_LineofCreditFacilityMaximumBorrowingCapacityAccordianFeature_A2528377BCB94829152A7A57D50E5550" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity, Accordian Feature</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_LineofCreditFacilityMaximumBorrowingCapacityAccordianFeature" xlink:label="loc_oas_LineofCreditFacilityMaximumBorrowingCapacityAccordianFeature_A2528377BCB94829152A7A57D50E5550" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_LineofCreditFacilityMaximumBorrowingCapacityAccordianFeature_A2528377BCB94829152A7A57D50E5550" xlink:to="lab_oas_LineofCreditFacilityMaximumBorrowingCapacityAccordianFeature_A2528377BCB94829152A7A57D50E5550" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtWeightedAverageInterestRate_990E24DCE59FCD88FEB17A57D50ECB1B_terseLabel_en-US" xlink:label="lab_us-gaap_DebtWeightedAverageInterestRate_990E24DCE59FCD88FEB17A57D50ECB1B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average interest rate (as percent)</link:label>
    <link:label id="lab_us-gaap_DebtWeightedAverageInterestRate_990E24DCE59FCD88FEB17A57D50ECB1B_label_en-US" xlink:label="lab_us-gaap_DebtWeightedAverageInterestRate_990E24DCE59FCD88FEB17A57D50ECB1B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt, Weighted Average Interest Rate</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtWeightedAverageInterestRate" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_990E24DCE59FCD88FEB17A57D50ECB1B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtWeightedAverageInterestRate_990E24DCE59FCD88FEB17A57D50ECB1B" xlink:to="lab_us-gaap_DebtWeightedAverageInterestRate_990E24DCE59FCD88FEB17A57D50ECB1B" xlink:type="arc" />
    <link:label id="lab_us-gaap_LettersOfCreditOutstandingAmount_42EB37EEC34F2C9C85E47A57D50F540D_terseLabel_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_42EB37EEC34F2C9C85E47A57D50F540D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Letters of credit outstanding</link:label>
    <link:label id="lab_us-gaap_LettersOfCreditOutstandingAmount_42EB37EEC34F2C9C85E47A57D50F540D_label_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_42EB37EEC34F2C9C85E47A57D50F540D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Letters of Credit Outstanding, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_42EB37EEC34F2C9C85E47A57D50F540D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LettersOfCreditOutstandingAmount_42EB37EEC34F2C9C85E47A57D50F540D" xlink:to="lab_us-gaap_LettersOfCreditOutstandingAmount_42EB37EEC34F2C9C85E47A57D50F540D" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_FAC3337C78809CAD401F7A57D50FADA8_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_FAC3337C78809CAD401F7A57D50FADA8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Line of credit facility, remaining borrowing capacity</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_FAC3337C78809CAD401F7A57D50FADA8_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_FAC3337C78809CAD401F7A57D50FADA8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Remaining Borrowing Capacity</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_FAC3337C78809CAD401F7A57D50FADA8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_FAC3337C78809CAD401F7A57D50FADA8" xlink:to="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_FAC3337C78809CAD401F7A57D50FADA8" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_E317FAA8A8C57EA47EFE7A57D50FD6BD_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_E317FAA8A8C57EA47EFE7A57D50FD6BD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commitment fee percentage</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_E317FAA8A8C57EA47EFE7A57D50FD6BD_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_E317FAA8A8C57EA47EFE7A57D50FD6BD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Unused Capacity, Commitment Fee Percentage</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_E317FAA8A8C57EA47EFE7A57D50FD6BD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_E317FAA8A8C57EA47EFE7A57D50FD6BD" xlink:to="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_E317FAA8A8C57EA47EFE7A57D50FD6BD" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_EAC3871B3C333A1461D67A57D50F3624_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_EAC3871B3C333A1461D67A57D50F3624" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt issued</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_EAC3871B3C333A1461D67A57D50F3624_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_EAC3871B3C333A1461D67A57D50F3624" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Face Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_EAC3871B3C333A1461D67A57D50F3624" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentFaceAmount_EAC3871B3C333A1461D67A57D50F3624" xlink:to="lab_us-gaap_DebtInstrumentFaceAmount_EAC3871B3C333A1461D67A57D50F3624" xlink:type="arc" />
    <link:label id="lab_us-gaap_UnsecuredDebt_D4EFDD67AD8B75E62C3E7A57D50F5B39_terseLabel_en-US" xlink:label="lab_us-gaap_UnsecuredDebt_D4EFDD67AD8B75E62C3E7A57D50F5B39" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unsecured debt</link:label>
    <link:label id="lab_us-gaap_UnsecuredDebt_D4EFDD67AD8B75E62C3E7A57D50F5B39_label_en-US" xlink:label="lab_us-gaap_UnsecuredDebt_D4EFDD67AD8B75E62C3E7A57D50F5B39" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unsecured Debt</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_UnsecuredDebt" xlink:label="loc_us-gaap_UnsecuredDebt_D4EFDD67AD8B75E62C3E7A57D50F5B39" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnsecuredDebt_D4EFDD67AD8B75E62C3E7A57D50F5B39" xlink:to="lab_us-gaap_UnsecuredDebt_D4EFDD67AD8B75E62C3E7A57D50F5B39" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_F3BEF76A98562129CCF47A57D5101297_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_F3BEF76A98562129CCF47A57D5101297" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of trading days</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_F3BEF76A98562129CCF47A57D5101297_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_F3BEF76A98562129CCF47A57D5101297" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Convertible, Threshold Trading Days</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentConvertibleThresholdTradingDays" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_F3BEF76A98562129CCF47A57D5101297" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_F3BEF76A98562129CCF47A57D5101297" xlink:to="lab_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_F3BEF76A98562129CCF47A57D5101297" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_16084EA25B42F62FEC9B7A57D51028FB_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_16084EA25B42F62FEC9B7A57D51028FB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of consecutive trading days</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_16084EA25B42F62FEC9B7A57D51028FB_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_16084EA25B42F62FEC9B7A57D51028FB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Convertible, Threshold Consecutive Trading Days</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_16084EA25B42F62FEC9B7A57D51028FB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_16084EA25B42F62FEC9B7A57D51028FB" xlink:to="lab_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_16084EA25B42F62FEC9B7A57D51028FB" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_DDC0EBF77C6F54BC33FF7A57D5111763_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_DDC0EBF77C6F54BC33FF7A57D5111763" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock price relative to conversion price (percent)</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_DDC0EBF77C6F54BC33FF7A57D5111763_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_DDC0EBF77C6F54BC33FF7A57D5111763" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_DDC0EBF77C6F54BC33FF7A57D5111763" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_DDC0EBF77C6F54BC33FF7A57D5111763" xlink:to="lab_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_DDC0EBF77C6F54BC33FF7A57D5111763" xlink:type="arc" />
    <link:label id="lab_oas_DebtInstrumentConvertibleThresholdPercentageofStockPricetoProductofStockSalePriceandConversionRate_F8AB6704C8C262C4A0F37A57D511C6F7_terseLabel_en-US" xlink:label="lab_oas_DebtInstrumentConvertibleThresholdPercentageofStockPricetoProductofStockSalePriceandConversionRate_F8AB6704C8C262C4A0F37A57D511C6F7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock price relative to product of sale price and conversion rate (percent)</link:label>
    <link:label id="lab_oas_DebtInstrumentConvertibleThresholdPercentageofStockPricetoProductofStockSalePriceandConversionRate_F8AB6704C8C262C4A0F37A57D511C6F7_label_en-US" xlink:label="lab_oas_DebtInstrumentConvertibleThresholdPercentageofStockPricetoProductofStockSalePriceandConversionRate_F8AB6704C8C262C4A0F37A57D511C6F7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Convertible, Threshold Percentage of Stock Price to Product of Stock Sale Price and Conversion Rate</link:label>
    <link:label id="lab_oas_DebtInstrumentConvertibleThresholdPercentageofStockPricetoProductofStockSalePriceandConversionRate_F8AB6704C8C262C4A0F37A57D511C6F7_documentation_en-US" xlink:label="lab_oas_DebtInstrumentConvertibleThresholdPercentageofStockPricetoProductofStockSalePriceandConversionRate_F8AB6704C8C262C4A0F37A57D511C6F7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt Instrument, Convertible, Threshold Percentage of Stock Price to Product of Stock Sale Price and Conversion Rate</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_DebtInstrumentConvertibleThresholdPercentageofStockPricetoProductofStockSalePriceandConversionRate" xlink:label="loc_oas_DebtInstrumentConvertibleThresholdPercentageofStockPricetoProductofStockSalePriceandConversionRate_F8AB6704C8C262C4A0F37A57D511C6F7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_DebtInstrumentConvertibleThresholdPercentageofStockPricetoProductofStockSalePriceandConversionRate_F8AB6704C8C262C4A0F37A57D511C6F7" xlink:to="lab_oas_DebtInstrumentConvertibleThresholdPercentageofStockPricetoProductofStockSalePriceandConversionRate_F8AB6704C8C262C4A0F37A57D511C6F7" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleConversionRatio1_CB568E98427AD6F933F27A57D5117ED4_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleConversionRatio1_CB568E98427AD6F933F27A57D5117ED4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt conversion rate per $1000 principal (in shares per $1000)</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleConversionRatio1_CB568E98427AD6F933F27A57D5117ED4_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleConversionRatio1_CB568E98427AD6F933F27A57D5117ED4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Convertible, Conversion Ratio</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentConvertibleConversionRatio1" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionRatio1_CB568E98427AD6F933F27A57D5117ED4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentConvertibleConversionRatio1_CB568E98427AD6F933F27A57D5117ED4" xlink:to="lab_us-gaap_DebtInstrumentConvertibleConversionRatio1_CB568E98427AD6F933F27A57D5117ED4" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleConversionPrice1_A6EDEF2702BC01010B937A57D511DF7A_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleConversionPrice1_A6EDEF2702BC01010B937A57D511DF7A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt conversion price (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleConversionPrice1_A6EDEF2702BC01010B937A57D511DF7A_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleConversionPrice1_A6EDEF2702BC01010B937A57D511DF7A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Convertible, Conversion Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_A6EDEF2702BC01010B937A57D511DF7A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_A6EDEF2702BC01010B937A57D511DF7A" xlink:to="lab_us-gaap_DebtInstrumentConvertibleConversionPrice1_A6EDEF2702BC01010B937A57D511DF7A" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_62DBDC1FD11E2F7C127A7A57D51276E5_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_62DBDC1FD11E2F7C127A7A57D51276E5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Spread on variable rate</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_62DBDC1FD11E2F7C127A7A57D51276E5_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_62DBDC1FD11E2F7C127A7A57D51276E5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Basis Spread on Variable Rate</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_62DBDC1FD11E2F7C127A7A57D51276E5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_62DBDC1FD11E2F7C127A7A57D51276E5" xlink:to="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_62DBDC1FD11E2F7C127A7A57D51276E5" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_1E6309B5122EB7A948C179987AD4996C_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_1E6309B5122EB7A948C179987AD4996C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Business Acquisitions, by Acquisition [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_1E6309B5122EB7A948C179987AD4996C_label_en-US" xlink:label="lab_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_1E6309B5122EB7A948C179987AD4996C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Business Acquisitions, by Acquisition [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_1E6309B5122EB7A948C179987AD4996C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_1E6309B5122EB7A948C179987AD4996C" xlink:to="lab_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_1E6309B5122EB7A948C179987AD4996C" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_DDAE8CBBD9BC53F9505C79987AD4AF9D_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_DDAE8CBBD9BC53F9505C79987AD4AF9D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Type [Axis]</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_DDAE8CBBD9BC53F9505C79987AD4AF9D_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_DDAE8CBBD9BC53F9505C79987AD4AF9D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Type [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_DDAE8CBBD9BC53F9505C79987AD4AF9D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_DDAE8CBBD9BC53F9505C79987AD4AF9D" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_DDAE8CBBD9BC53F9505C79987AD4AF9D" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_DBC8E5471FF3FE8CF03779987AD4D24A_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_DBC8E5471FF3FE8CF03779987AD4D24A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Type [Domain]</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_DBC8E5471FF3FE8CF03779987AD4D24A_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_DBC8E5471FF3FE8CF03779987AD4D24A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Type [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_DBC8E5471FF3FE8CF03779987AD4D24A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_DBC8E5471FF3FE8CF03779987AD4D24A" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_DBC8E5471FF3FE8CF03779987AD4D24A" xlink:type="arc" />
    <link:label id="lab_oas_ProvedOilAndGasPropertiesMember_991B3DEFF4513381FEC779987AD41BA5_terseLabel_en-US" xlink:label="lab_oas_ProvedOilAndGasPropertiesMember_991B3DEFF4513381FEC779987AD41BA5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proved Oil And Gas Properties</link:label>
    <link:label id="lab_oas_ProvedOilAndGasPropertiesMember_991B3DEFF4513381FEC779987AD41BA5_label_en-US" xlink:label="lab_oas_ProvedOilAndGasPropertiesMember_991B3DEFF4513381FEC779987AD41BA5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proved Oil And Gas Properties [Member]</link:label>
    <link:label id="lab_oas_ProvedOilAndGasPropertiesMember_991B3DEFF4513381FEC779987AD41BA5_documentation_en-US" xlink:label="lab_oas_ProvedOilAndGasPropertiesMember_991B3DEFF4513381FEC779987AD41BA5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Proved Oil And Gas Properties [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_ProvedOilAndGasPropertiesMember" xlink:label="loc_oas_ProvedOilAndGasPropertiesMember_991B3DEFF4513381FEC779987AD41BA5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_ProvedOilAndGasPropertiesMember_991B3DEFF4513381FEC779987AD41BA5" xlink:to="lab_oas_ProvedOilAndGasPropertiesMember_991B3DEFF4513381FEC779987AD41BA5" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentOtherTypesMember_567C78AB4DF19754345D79CA1B1431FA_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentOtherTypesMember_567C78AB4DF19754345D79CA1B1431FA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Other Types</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentOtherTypesMember_567C78AB4DF19754345D79CA1B1431FA_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentOtherTypesMember_567C78AB4DF19754345D79CA1B1431FA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Other Types [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentOtherTypesMember" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentOtherTypesMember_567C78AB4DF19754345D79CA1B1431FA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentOtherTypesMember_567C78AB4DF19754345D79CA1B1431FA" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentOtherTypesMember_567C78AB4DF19754345D79CA1B1431FA" xlink:type="arc" />
    <link:label id="lab_us-gaap_BusinessAcquisitionLineItems_42F20272F5B5BDA3FD9D79987AD4AF50_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionLineItems_42F20272F5B5BDA3FD9D79987AD4AF50" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Business Acquisition [Line Items]</link:label>
    <link:label id="lab_us-gaap_BusinessAcquisitionLineItems_42F20272F5B5BDA3FD9D79987AD4AF50_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionLineItems_42F20272F5B5BDA3FD9D79987AD4AF50" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Acquisition [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_42F20272F5B5BDA3FD9D79987AD4AF50" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_42F20272F5B5BDA3FD9D79987AD4AF50" xlink:to="lab_us-gaap_BusinessAcquisitionLineItems_42F20272F5B5BDA3FD9D79987AD4AF50" xlink:type="arc" />
    <link:label id="lab_us-gaap_CapitalizedCostsAssetRetirementCosts_5934BF28355A28B22EAB79987AD4F899_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalizedCostsAssetRetirementCosts_5934BF28355A28B22EAB79987AD4F899" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Estimate of future asset retirement costs</link:label>
    <link:label id="lab_us-gaap_CapitalizedCostsAssetRetirementCosts_5934BF28355A28B22EAB79987AD4F899_label_en-US" xlink:label="lab_us-gaap_CapitalizedCostsAssetRetirementCosts_5934BF28355A28B22EAB79987AD4F899" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capitalized Costs, Asset Retirement Costs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CapitalizedCostsAssetRetirementCosts" xlink:label="loc_us-gaap_CapitalizedCostsAssetRetirementCosts_5934BF28355A28B22EAB79987AD4F899" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CapitalizedCostsAssetRetirementCosts_5934BF28355A28B22EAB79987AD4F899" xlink:to="lab_us-gaap_CapitalizedCostsAssetRetirementCosts_5934BF28355A28B22EAB79987AD4F899" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_B864AD9F2DEDA2DE3B70989715410B95_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_B864AD9F2DEDA2DE3B70989715410B95" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disposal Groups, Including Discontinued Operations [Table]</link:label>
    <link:label id="lab_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_B864AD9F2DEDA2DE3B70989715410B95_label_en-US" xlink:label="lab_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_B864AD9F2DEDA2DE3B70989715410B95" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disposal Groups, Including Discontinued Operations [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_B864AD9F2DEDA2DE3B70989715410B95" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_B864AD9F2DEDA2DE3B70989715410B95" xlink:to="lab_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_B864AD9F2DEDA2DE3B70989715410B95" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_0EEB8B81570E06BD586298971542AEBA_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_0EEB8B81570E06BD586298971542AEBA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disposal Group Name [Axis]</link:label>
    <link:label id="lab_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_0EEB8B81570E06BD586298971542AEBA_label_en-US" xlink:label="lab_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_0EEB8B81570E06BD586298971542AEBA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disposal Group Name [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_0EEB8B81570E06BD586298971542AEBA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_0EEB8B81570E06BD586298971542AEBA" xlink:to="lab_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_0EEB8B81570E06BD586298971542AEBA" xlink:type="arc" />
    <link:label id="lab_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_633B22A62CEF10321EB39897154276E5_terseLabel_en-US" xlink:label="lab_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_633B22A62CEF10321EB39897154276E5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disposal Group Name [Domain]</link:label>
    <link:label id="lab_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_633B22A62CEF10321EB39897154276E5_label_en-US" xlink:label="lab_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_633B22A62CEF10321EB39897154276E5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disposal Group Name [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_633B22A62CEF10321EB39897154276E5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_633B22A62CEF10321EB39897154276E5" xlink:to="lab_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_633B22A62CEF10321EB39897154276E5" xlink:type="arc" />
    <link:label id="lab_oas_ForemanButteDivestitureMember_EFCAC3F094F4B401AE6498971542F5A2_terseLabel_en-US" xlink:label="lab_oas_ForemanButteDivestitureMember_EFCAC3F094F4B401AE6498971542F5A2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Foreman Butte Area</link:label>
    <link:label id="lab_oas_ForemanButteDivestitureMember_EFCAC3F094F4B401AE6498971542F5A2_label_en-US" xlink:label="lab_oas_ForemanButteDivestitureMember_EFCAC3F094F4B401AE6498971542F5A2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Foreman Butte Divestiture [Member]</link:label>
    <link:label id="lab_oas_ForemanButteDivestitureMember_EFCAC3F094F4B401AE6498971542F5A2_documentation_en-US" xlink:label="lab_oas_ForemanButteDivestitureMember_EFCAC3F094F4B401AE6498971542F5A2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Foreman Butte Divestiture [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_ForemanButteDivestitureMember" xlink:label="loc_oas_ForemanButteDivestitureMember_EFCAC3F094F4B401AE6498971542F5A2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_ForemanButteDivestitureMember_EFCAC3F094F4B401AE6498971542F5A2" xlink:to="lab_oas_ForemanButteDivestitureMember_EFCAC3F094F4B401AE6498971542F5A2" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_C2C20D8B18F3F1857B2998971542942C_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_C2C20D8B18F3F1857B2998971542942C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]</link:label>
    <link:label id="lab_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_C2C20D8B18F3F1857B2998971542942C_label_en-US" xlink:label="lab_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_C2C20D8B18F3F1857B2998971542942C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_C2C20D8B18F3F1857B2998971542942C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_C2C20D8B18F3F1857B2998971542942C" xlink:to="lab_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_C2C20D8B18F3F1857B2998971542942C" xlink:type="arc" />
    <link:label id="lab_us-gaap_RevenueFromContractWithCustomerTextBlock_3F5BEFC8BD2CFAB8454A602EBF96680B_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerTextBlock_3F5BEFC8BD2CFAB8454A602EBF96680B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenue Recognition</link:label>
    <link:label id="lab_us-gaap_RevenueFromContractWithCustomerTextBlock_3F5BEFC8BD2CFAB8454A602EBF96680B_label_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerTextBlock_3F5BEFC8BD2CFAB8454A602EBF96680B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue from Contract with Customer [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueFromContractWithCustomerTextBlock" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerTextBlock_3F5BEFC8BD2CFAB8454A602EBF96680B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerTextBlock_3F5BEFC8BD2CFAB8454A602EBF96680B" xlink:to="lab_us-gaap_RevenueFromContractWithCustomerTextBlock_3F5BEFC8BD2CFAB8454A602EBF96680B" xlink:type="arc" />
    <link:label id="lab_oas_OMPGeneralPartnerLLCMember_BFCD946122DC767A1CF079D051C28616_terseLabel_en-US" xlink:label="lab_oas_OMPGeneralPartnerLLCMember_BFCD946122DC767A1CF079D051C28616" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">OMP General Partner LLC</link:label>
    <link:label id="lab_oas_OMPGeneralPartnerLLCMember_BFCD946122DC767A1CF079D051C28616_label_en-US" xlink:label="lab_oas_OMPGeneralPartnerLLCMember_BFCD946122DC767A1CF079D051C28616" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">OMP General Partner LLC [Member]</link:label>
    <link:label id="lab_oas_OMPGeneralPartnerLLCMember_BFCD946122DC767A1CF079D051C28616_documentation_en-US" xlink:label="lab_oas_OMPGeneralPartnerLLCMember_BFCD946122DC767A1CF079D051C28616" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">OMP General Partner LLC [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_OMPGeneralPartnerLLCMember" xlink:label="loc_oas_OMPGeneralPartnerLLCMember_BFCD946122DC767A1CF079D051C28616" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_OMPGeneralPartnerLLCMember_BFCD946122DC767A1CF079D051C28616" xlink:to="lab_oas_OMPGeneralPartnerLLCMember_BFCD946122DC767A1CF079D051C28616" xlink:type="arc" />
    <link:label id="lab_us-gaap_RestrictedStockMember_BC5053E0816BB6860E7479D051C3179D_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedStockMember_BC5053E0816BB6860E7479D051C3179D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restricted Stock</link:label>
    <link:label id="lab_us-gaap_RestrictedStockMember_BC5053E0816BB6860E7479D051C3179D_label_en-US" xlink:label="lab_us-gaap_RestrictedStockMember_BC5053E0816BB6860E7479D051C3179D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restricted Stock [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_BC5053E0816BB6860E7479D051C3179D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestrictedStockMember_BC5053E0816BB6860E7479D051C3179D" xlink:to="lab_us-gaap_RestrictedStockMember_BC5053E0816BB6860E7479D051C3179D" xlink:type="arc" />
    <link:label id="lab_oas_PerformanceShareUnitAwardsMember_48244BCBD9E8AEF9BC1B79D051C4778B_terseLabel_en-US" xlink:label="lab_oas_PerformanceShareUnitAwardsMember_48244BCBD9E8AEF9BC1B79D051C4778B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Performance Share Unit Awards</link:label>
    <link:label id="lab_oas_PerformanceShareUnitAwardsMember_48244BCBD9E8AEF9BC1B79D051C4778B_label_en-US" xlink:label="lab_oas_PerformanceShareUnitAwardsMember_48244BCBD9E8AEF9BC1B79D051C4778B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Performance Share Unit Awards [Member]</link:label>
    <link:label id="lab_oas_PerformanceShareUnitAwardsMember_48244BCBD9E8AEF9BC1B79D051C4778B_documentation_en-US" xlink:label="lab_oas_PerformanceShareUnitAwardsMember_48244BCBD9E8AEF9BC1B79D051C4778B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Performance Share Unit Awards [Member]</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_PerformanceShareUnitAwardsMember" xlink:label="loc_oas_PerformanceShareUnitAwardsMember_48244BCBD9E8AEF9BC1B79D051C4778B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_PerformanceShareUnitAwardsMember_48244BCBD9E8AEF9BC1B79D051C4778B" xlink:to="lab_oas_PerformanceShareUnitAwardsMember_48244BCBD9E8AEF9BC1B79D051C4778B" xlink:type="arc" />
    <link:label id="lab_us-gaap_PhantomShareUnitsPSUsMember_CB01EA8B202281B4788879D051C561FF_terseLabel_en-US" xlink:label="lab_us-gaap_PhantomShareUnitsPSUsMember_CB01EA8B202281B4788879D051C561FF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Phantom Units</link:label>
    <link:label id="lab_us-gaap_PhantomShareUnitsPSUsMember_CB01EA8B202281B4788879D051C561FF_label_en-US" xlink:label="lab_us-gaap_PhantomShareUnitsPSUsMember_CB01EA8B202281B4788879D051C561FF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Phantom Share Units (PSUs) [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PhantomShareUnitsPSUsMember" xlink:label="loc_us-gaap_PhantomShareUnitsPSUsMember_CB01EA8B202281B4788879D051C561FF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PhantomShareUnitsPSUsMember_CB01EA8B202281B4788879D051C561FF" xlink:to="lab_us-gaap_PhantomShareUnitsPSUsMember_CB01EA8B202281B4788879D051C561FF" xlink:type="arc" />
    <link:label id="lab_us-gaap_RestrictedStockUnitsRSUMember_28DBC9D25DBCB37B701079D051C56C3B_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedStockUnitsRSUMember_28DBC9D25DBCB37B701079D051C56C3B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restricted Stock Units (RSUs)</link:label>
    <link:label id="lab_us-gaap_RestrictedStockUnitsRSUMember_28DBC9D25DBCB37B701079D051C56C3B_label_en-US" xlink:label="lab_us-gaap_RestrictedStockUnitsRSUMember_28DBC9D25DBCB37B701079D051C56C3B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restricted Stock Units (RSUs) [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_28DBC9D25DBCB37B701079D051C56C3B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestrictedStockUnitsRSUMember_28DBC9D25DBCB37B701079D051C56C3B" xlink:to="lab_us-gaap_RestrictedStockUnitsRSUMember_28DBC9D25DBCB37B701079D051C56C3B" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_061792C9CC6B42A6B97079D051C7E084_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_061792C9CC6B42A6B97079D051C7E084" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Award vesting period</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_061792C9CC6B42A6B97079D051C7E084_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_061792C9CC6B42A6B97079D051C7E084" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_061792C9CC6B42A6B97079D051C7E084" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_061792C9CC6B42A6B97079D051C7E084" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_061792C9CC6B42A6B97079D051C7E084" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_34D34EC1943E0899EF1F79D051C7CBF7_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_34D34EC1943E0899EF1F79D051C7CBF7" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Stock granted (in shares)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_34D34EC1943E0899EF1F79D051C7CBF7_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_34D34EC1943E0899EF1F79D051C7CBF7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_34D34EC1943E0899EF1F79D051C7CBF7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_34D34EC1943E0899EF1F79D051C7CBF7" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_34D34EC1943E0899EF1F79D051C7CBF7" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_37FC8273177BDA99848E79D051C7A547_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_37FC8273177BDA99848E79D051C7A547" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Granted, weighted average grant date fair value per unit (in usd per share)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_37FC8273177BDA99848E79D051C7A547_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_37FC8273177BDA99848E79D051C7A547" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_37FC8273177BDA99848E79D051C7A547" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_37FC8273177BDA99848E79D051C7A547" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_37FC8273177BDA99848E79D051C7A547" xlink:type="arc" />
    <link:label id="lab_oas_RightsReceivedForEachPerformanceShareUnit1_2D9DB60A3DF8D145266579D051C8C163_terseLabel_en-US" xlink:label="lab_oas_RightsReceivedForEachPerformanceShareUnit1_2D9DB60A3DF8D145266579D051C8C163" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Right to received shares of common stock (in shares)</link:label>
    <link:label id="lab_oas_RightsReceivedForEachPerformanceShareUnit1_2D9DB60A3DF8D145266579D051C8C163_label_en-US" xlink:label="lab_oas_RightsReceivedForEachPerformanceShareUnit1_2D9DB60A3DF8D145266579D051C8C163" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rights Received For Each Performance Share Unit1</link:label>
    <link:label id="lab_oas_RightsReceivedForEachPerformanceShareUnit1_2D9DB60A3DF8D145266579D051C8C163_documentation_en-US" xlink:label="lab_oas_RightsReceivedForEachPerformanceShareUnit1_2D9DB60A3DF8D145266579D051C8C163" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Rights Received For Each Performance Share Unit1</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_RightsReceivedForEachPerformanceShareUnit1" xlink:label="loc_oas_RightsReceivedForEachPerformanceShareUnit1_2D9DB60A3DF8D145266579D051C8C163" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_RightsReceivedForEachPerformanceShareUnit1_2D9DB60A3DF8D145266579D051C8C163" xlink:to="lab_oas_RightsReceivedForEachPerformanceShareUnit1_2D9DB60A3DF8D145266579D051C8C163" xlink:type="arc" />
    <link:label id="lab_oas_PercentageOfPerformanceShareAwardsBasedOnShareholderReturn_40A5FAD9611C9099C0DE79D051C99C62_terseLabel_en-US" xlink:label="lab_oas_PercentageOfPerformanceShareAwardsBasedOnShareholderReturn_40A5FAD9611C9099C0DE79D051C99C62" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">PSU granted percentage of earnings (as a percent)</link:label>
    <link:label id="lab_oas_PercentageOfPerformanceShareAwardsBasedOnShareholderReturn_40A5FAD9611C9099C0DE79D051C99C62_label_en-US" xlink:label="lab_oas_PercentageOfPerformanceShareAwardsBasedOnShareholderReturn_40A5FAD9611C9099C0DE79D051C99C62" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage Of Performance Share Awards Based On Shareholder Return</link:label>
    <link:label id="lab_oas_PercentageOfPerformanceShareAwardsBasedOnShareholderReturn_40A5FAD9611C9099C0DE79D051C99C62_documentation_en-US" xlink:label="lab_oas_PercentageOfPerformanceShareAwardsBasedOnShareholderReturn_40A5FAD9611C9099C0DE79D051C99C62" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage Of Performance Share Awards Based On Shareholder Return</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_PercentageOfPerformanceShareAwardsBasedOnShareholderReturn" xlink:label="loc_oas_PercentageOfPerformanceShareAwardsBasedOnShareholderReturn_40A5FAD9611C9099C0DE79D051C99C62" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_PercentageOfPerformanceShareAwardsBasedOnShareholderReturn_40A5FAD9611C9099C0DE79D051C99C62" xlink:to="lab_oas_PercentageOfPerformanceShareAwardsBasedOnShareholderReturn_40A5FAD9611C9099C0DE79D051C99C62" xlink:type="arc" />
    <link:label id="lab_oas_NumberOfTradingDaysConsiderForAverageClosingPrice_EE31357767B7852835C979D051C98A39_terseLabel_en-US" xlink:label="lab_oas_NumberOfTradingDaysConsiderForAverageClosingPrice_EE31357767B7852835C979D051C98A39" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of trading days</link:label>
    <link:label id="lab_oas_NumberOfTradingDaysConsiderForAverageClosingPrice_EE31357767B7852835C979D051C98A39_label_en-US" xlink:label="lab_oas_NumberOfTradingDaysConsiderForAverageClosingPrice_EE31357767B7852835C979D051C98A39" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Trading Days Consider For Average Closing Price</link:label>
    <link:label id="lab_oas_NumberOfTradingDaysConsiderForAverageClosingPrice_EE31357767B7852835C979D051C98A39_documentation_en-US" xlink:label="lab_oas_NumberOfTradingDaysConsiderForAverageClosingPrice_EE31357767B7852835C979D051C98A39" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number Of Trading Days Consider For Average Closing Price</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_NumberOfTradingDaysConsiderForAverageClosingPrice" xlink:label="loc_oas_NumberOfTradingDaysConsiderForAverageClosingPrice_EE31357767B7852835C979D051C98A39" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_NumberOfTradingDaysConsiderForAverageClosingPrice_EE31357767B7852835C979D051C98A39" xlink:to="lab_oas_NumberOfTradingDaysConsiderForAverageClosingPrice_EE31357767B7852835C979D051C98A39" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_95222C1D95187AAF88CC79D051C9D188_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_95222C1D95187AAF88CC79D051C9D188" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Vesting period</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_95222C1D95187AAF88CC79D051C9D188_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_95222C1D95187AAF88CC79D051C9D188" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_95222C1D95187AAF88CC79D051C9D188" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_95222C1D95187AAF88CC79D051C9D188" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_95222C1D95187AAF88CC79D051C9D188" xlink:type="arc" />
    <link:label id="lab_us-gaap_SignificantAccountingPoliciesTextBlock_B5226B0A0296B79828C3602EBFB535A2_terseLabel_en-US" xlink:label="lab_us-gaap_SignificantAccountingPoliciesTextBlock_B5226B0A0296B79828C3602EBFB535A2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of Significant Accounting Policies</link:label>
    <link:label id="lab_us-gaap_SignificantAccountingPoliciesTextBlock_B5226B0A0296B79828C3602EBFB535A2_label_en-US" xlink:label="lab_us-gaap_SignificantAccountingPoliciesTextBlock_B5226B0A0296B79828C3602EBFB535A2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Significant Accounting Policies [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SignificantAccountingPoliciesTextBlock" xlink:label="loc_us-gaap_SignificantAccountingPoliciesTextBlock_B5226B0A0296B79828C3602EBFB535A2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SignificantAccountingPoliciesTextBlock_B5226B0A0296B79828C3602EBFB535A2" xlink:to="lab_us-gaap_SignificantAccountingPoliciesTextBlock_B5226B0A0296B79828C3602EBFB535A2" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock_73DB53D2B54A08B40591602EBF5A1A54_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock_73DB53D2B54A08B40591602EBF5A1A54" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative Instruments</link:label>
    <link:label id="lab_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock_73DB53D2B54A08B40591602EBF5A1A54_label_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock_73DB53D2B54A08B40591602EBF5A1A54" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Instruments and Hedging Activities Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock_73DB53D2B54A08B40591602EBF5A1A54" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock_73DB53D2B54A08B40591602EBF5A1A54" xlink:to="lab_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock_73DB53D2B54A08B40591602EBF5A1A54" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfDebtTableTextBlock_3A7021D7123DBC1F7471602EBEE7D94D_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfDebtTableTextBlock_3A7021D7123DBC1F7471602EBEE7D94D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Long-Term Debt</link:label>
    <link:label id="lab_us-gaap_ScheduleOfDebtTableTextBlock_3A7021D7123DBC1F7471602EBEE7D94D_label_en-US" xlink:label="lab_us-gaap_ScheduleOfDebtTableTextBlock_3A7021D7123DBC1F7471602EBEE7D94D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Debt [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfDebtTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfDebtTableTextBlock_3A7021D7123DBC1F7471602EBEE7D94D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfDebtTableTextBlock_3A7021D7123DBC1F7471602EBEE7D94D" xlink:to="lab_us-gaap_ScheduleOfDebtTableTextBlock_3A7021D7123DBC1F7471602EBEE7D94D" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentsTextBlock_1CF2F8E15A2D249B611F7989D8C1FD51_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentsTextBlock_1CF2F8E15A2D249B611F7989D8C1FD51" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Impacts of Revisions to the Company&#8217;s Condensed Consolidated Statement of Operations</link:label>
    <link:label id="lab_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentsTextBlock_1CF2F8E15A2D249B611F7989D8C1FD51_label_en-US" xlink:label="lab_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentsTextBlock_1CF2F8E15A2D249B611F7989D8C1FD51" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentsTextBlock" xlink:label="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentsTextBlock_1CF2F8E15A2D249B611F7989D8C1FD51" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentsTextBlock_1CF2F8E15A2D249B611F7989D8C1FD51" xlink:to="lab_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentsTextBlock_1CF2F8E15A2D249B611F7989D8C1FD51" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_CAFD746138E4941FA77B602EBF3AEF96_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_CAFD746138E4941FA77B602EBF3AEF96" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_CAFD746138E4941FA77B602EBF3AEF96_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_CAFD746138E4941FA77B602EBF3AEF96" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_CAFD746138E4941FA77B602EBF3AEF96" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_CAFD746138E4941FA77B602EBF3AEF96" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_CAFD746138E4941FA77B602EBF3AEF96" xlink:type="arc" />
    <link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_25953AC20C8FF67057A5602EBE930B18_terseLabel_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_25953AC20C8FF67057A5602EBE930B18" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity-Based Compensation</link:label>
    <link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_25953AC20C8FF67057A5602EBE930B18_label_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_25953AC20C8FF67057A5602EBE930B18" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of Compensation Related Costs, Share-based Payments [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_25953AC20C8FF67057A5602EBE930B18" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_25953AC20C8FF67057A5602EBE930B18" xlink:to="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_25953AC20C8FF67057A5602EBE930B18" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseExpense_F5BBB61346745D422B16935F4DA23B3F_verboseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseExpense_F5BBB61346745D422B16935F4DA23B3F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Lease operating expenses</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseExpense" xlink:label="loc_us-gaap_OperatingLeaseExpense_F5BBB61346745D422B16935F4DA23B3F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseExpense_F5BBB61346745D422B16935F4DA23B3F" xlink:to="lab_us-gaap_OperatingLeaseExpense_F5BBB61346745D422B16935F4DA23B3F" xlink:type="arc" />
    <link:label id="lab_us-gaap_GainLossOnSaleOfProperty_EEC3BA205DFEC06FE240935F4DA530DF_verboseLabel_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfProperty_EEC3BA205DFEC06FE240935F4DA530DF" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Loss on sale of properties</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GainLossOnSaleOfProperty" xlink:label="loc_us-gaap_GainLossOnSaleOfProperty_EEC3BA205DFEC06FE240935F4DA530DF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GainLossOnSaleOfProperty_EEC3BA205DFEC06FE240935F4DA530DF" xlink:to="lab_us-gaap_GainLossOnSaleOfProperty_EEC3BA205DFEC06FE240935F4DA530DF" xlink:type="arc" />
    <link:label id="lab_oas_EquityInEarningsInSubsidiaries_873017B1FD04ED779BA0935F4DA6F8A3_terseLabel_en-US" xlink:label="lab_oas_EquityInEarningsInSubsidiaries_873017B1FD04ED779BA0935F4DA6F8A3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity In Earnings In Subsidiaries</link:label>
    <link:loc xlink:href="oas-20190331.xsd#oas_EquityInEarningsInSubsidiaries" xlink:label="loc_oas_EquityInEarningsInSubsidiaries_873017B1FD04ED779BA0935F4DA6F8A3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oas_EquityInEarningsInSubsidiaries_873017B1FD04ED779BA0935F4DA6F8A3" xlink:to="lab_oas_EquityInEarningsInSubsidiaries_873017B1FD04ED779BA0935F4DA6F8A3" xlink:type="arc" />
    <link:label id="lab_us-gaap_InterestExpense_A918C81AA5C6E0BD3448935F4DA62585_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_InterestExpense_A918C81AA5C6E0BD3448935F4DA62585" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Interest expense, net of capitalized interest</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_A918C81AA5C6E0BD3448935F4DA62585" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestExpense_A918C81AA5C6E0BD3448935F4DA62585" xlink:to="lab_us-gaap_InterestExpense_A918C81AA5C6E0BD3448935F4DA62585" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherNonoperatingIncomeExpense_6DCABAA771FB39B37229935F4DA7AFCE_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherNonoperatingIncomeExpense_6DCABAA771FB39B37229935F4DA7AFCE" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Other income (expense)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_6DCABAA771FB39B37229935F4DA7AFCE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpense_6DCABAA771FB39B37229935F4DA7AFCE" xlink:to="lab_us-gaap_OtherNonoperatingIncomeExpense_6DCABAA771FB39B37229935F4DA7AFCE" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeTaxExpenseBenefit_026BFCCD6DA4D47134B8935F4DA77206_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxExpenseBenefit_026BFCCD6DA4D47134B8935F4DA77206" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Income tax benefit (expense)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_026BFCCD6DA4D47134B8935F4DA77206" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_026BFCCD6DA4D47134B8935F4DA77206" xlink:to="lab_us-gaap_IncomeTaxExpenseBenefit_026BFCCD6DA4D47134B8935F4DA77206" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_EDADE9AC94CCF590921A79987AE4C813_terseLabel_en-US" xlink:label="lab_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_EDADE9AC94CCF590921A79987AE4C813" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]</link:label>
    <link:label id="lab_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_EDADE9AC94CCF590921A79987AE4C813_label_en-US" xlink:label="lab_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_EDADE9AC94CCF590921A79987AE4C813" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_EDADE9AC94CCF590921A79987AE4C813" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_EDADE9AC94CCF590921A79987AE4C813" xlink:to="lab_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_EDADE9AC94CCF590921A79987AE4C813" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommodityContractMember_B65C1F88B887779DF87F79987AE48706_terseLabel_en-US" xlink:label="lab_us-gaap_CommodityContractMember_B65C1F88B887779DF87F79987AE48706" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commodity derivative instruments</link:label>
    <link:label id="lab_us-gaap_CommodityContractMember_B65C1F88B887779DF87F79987AE48706_label_en-US" xlink:label="lab_us-gaap_CommodityContractMember_B65C1F88B887779DF87F79987AE48706" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commodity Contract [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommodityContractMember" xlink:label="loc_us-gaap_CommodityContractMember_B65C1F88B887779DF87F79987AE48706" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommodityContractMember_B65C1F88B887779DF87F79987AE48706" xlink:to="lab_us-gaap_CommodityContractMember_B65C1F88B887779DF87F79987AE48706" xlink:type="arc" />
    <link:label id="lab_us-gaap_BalanceSheetLocationAxis_553E381CBFE9ED75653379987AE44FCB_terseLabel_en-US" xlink:label="lab_us-gaap_BalanceSheetLocationAxis_553E381CBFE9ED75653379987AE44FCB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Balance Sheet Location [Axis]</link:label>
    <link:label id="lab_us-gaap_BalanceSheetLocationAxis_553E381CBFE9ED75653379987AE44FCB_label_en-US" xlink:label="lab_us-gaap_BalanceSheetLocationAxis_553E381CBFE9ED75653379987AE44FCB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Balance Sheet Location [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_553E381CBFE9ED75653379987AE44FCB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_553E381CBFE9ED75653379987AE44FCB" xlink:to="lab_us-gaap_BalanceSheetLocationAxis_553E381CBFE9ED75653379987AE44FCB" xlink:type="arc" />
    <link:label id="lab_us-gaap_BalanceSheetLocationDomain_929FBC875FA1350D464E79987AE459AB_terseLabel_en-US" xlink:label="lab_us-gaap_BalanceSheetLocationDomain_929FBC875FA1350D464E79987AE459AB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Balance Sheet Location [Domain]</link:label>
    <link:label id="lab_us-gaap_BalanceSheetLocationDomain_929FBC875FA1350D464E79987AE459AB_label_en-US" xlink:label="lab_us-gaap_BalanceSheetLocationDomain_929FBC875FA1350D464E79987AE459AB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Balance Sheet Location [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_929FBC875FA1350D464E79987AE459AB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_929FBC875FA1350D464E79987AE459AB" xlink:to="lab_us-gaap_BalanceSheetLocationDomain_929FBC875FA1350D464E79987AE459AB" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherCurrentAssetsMember_16F30F925F7A0A0466D379987AE48A47_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherCurrentAssetsMember_16F30F925F7A0A0466D379987AE48A47" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Current assets</link:label>
    <link:label id="lab_us-gaap_OtherCurrentAssetsMember_16F30F925F7A0A0466D379987AE48A47_label_en-US" xlink:label="lab_us-gaap_OtherCurrentAssetsMember_16F30F925F7A0A0466D379987AE48A47" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Current Assets [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherCurrentAssetsMember" xlink:label="loc_us-gaap_OtherCurrentAssetsMember_16F30F925F7A0A0466D379987AE48A47" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherCurrentAssetsMember_16F30F925F7A0A0466D379987AE48A47" xlink:to="lab_us-gaap_OtherCurrentAssetsMember_16F30F925F7A0A0466D379987AE48A47" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherNoncurrentAssetsMember_8B266CA56AD46FE90F2279987AE42928_terseLabel_en-US" xlink:label="lab_us-gaap_OtherNoncurrentAssetsMember_8B266CA56AD46FE90F2279987AE42928" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Noncurrent assets</link:label>
    <link:label id="lab_us-gaap_OtherNoncurrentAssetsMember_8B266CA56AD46FE90F2279987AE42928_label_en-US" xlink:label="lab_us-gaap_OtherNoncurrentAssetsMember_8B266CA56AD46FE90F2279987AE42928" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Noncurrent Assets [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherNoncurrentAssetsMember" xlink:label="loc_us-gaap_OtherNoncurrentAssetsMember_8B266CA56AD46FE90F2279987AE42928" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherNoncurrentAssetsMember_8B266CA56AD46FE90F2279987AE42928" xlink:to="lab_us-gaap_OtherNoncurrentAssetsMember_8B266CA56AD46FE90F2279987AE42928" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherCurrentLiabilitiesMember_9E81426CC03818EC323D79987AE40D80_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCurrentLiabilitiesMember_9E81426CC03818EC323D79987AE40D80" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current liabilities</link:label>
    <link:label id="lab_us-gaap_OtherCurrentLiabilitiesMember_9E81426CC03818EC323D79987AE40D80_label_en-US" xlink:label="lab_us-gaap_OtherCurrentLiabilitiesMember_9E81426CC03818EC323D79987AE40D80" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Current Liabilities [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherCurrentLiabilitiesMember" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_9E81426CC03818EC323D79987AE40D80" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherCurrentLiabilitiesMember_9E81426CC03818EC323D79987AE40D80" xlink:to="lab_us-gaap_OtherCurrentLiabilitiesMember_9E81426CC03818EC323D79987AE40D80" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherNoncurrentLiabilitiesMember_6512D7B408667B5DC6E979987AE44953_terseLabel_en-US" xlink:label="lab_us-gaap_OtherNoncurrentLiabilitiesMember_6512D7B408667B5DC6E979987AE44953" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Noncurrent liabilities</link:label>
    <link:label id="lab_us-gaap_OtherNoncurrentLiabilitiesMember_6512D7B408667B5DC6E979987AE44953_label_en-US" xlink:label="lab_us-gaap_OtherNoncurrentLiabilitiesMember_6512D7B408667B5DC6E979987AE44953" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Noncurrent Liabilities [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherNoncurrentLiabilitiesMember" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_6512D7B408667B5DC6E979987AE44953" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherNoncurrentLiabilitiesMember_6512D7B408667B5DC6E979987AE44953" xlink:to="lab_us-gaap_OtherNoncurrentLiabilitiesMember_6512D7B408667B5DC6E979987AE44953" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativesFairValueLineItems_7C47060652D0DE09C0F779987AE4A76B_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativesFairValueLineItems_7C47060652D0DE09C0F779987AE4A76B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivatives, Fair Value [Line Items]</link:label>
    <link:label id="lab_us-gaap_DerivativesFairValueLineItems_7C47060652D0DE09C0F779987AE4A76B_label_en-US" xlink:label="lab_us-gaap_DerivativesFairValueLineItems_7C47060652D0DE09C0F779987AE4A76B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivatives, Fair Value [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativesFairValueLineItems" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_7C47060652D0DE09C0F779987AE4A76B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_7C47060652D0DE09C0F779987AE4A76B" xlink:to="lab_us-gaap_DerivativesFairValueLineItems_7C47060652D0DE09C0F779987AE4A76B" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeAsset_BB9BCBE0FC4D142B0E5C79987AE4CAE8_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeAsset_BB9BCBE0FC4D142B0E5C79987AE4CAE8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative asset, gross amounts recognized</link:label>
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeAsset_BB9BCBE0FC4D142B0E5C79987AE4CAE8_label_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeAsset_BB9BCBE0FC4D142B0E5C79987AE4CAE8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset, Fair Value, Gross Asset</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_BB9BCBE0FC4D142B0E5C79987AE4CAE8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_BB9BCBE0FC4D142B0E5C79987AE4CAE8" xlink:to="lab_us-gaap_DerivativeFairValueOfDerivativeAsset_BB9BCBE0FC4D142B0E5C79987AE4CAE8" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_E264EDF8862E18B563CE79987AE4BB9E_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_E264EDF8862E18B563CE79987AE4BB9E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative liability, gross amount recognized</link:label>
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_E264EDF8862E18B563CE79987AE4BB9E_label_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_E264EDF8862E18B563CE79987AE4BB9E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Fair Value, Gross Liability</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_E264EDF8862E18B563CE79987AE4BB9E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_E264EDF8862E18B563CE79987AE4BB9E" xlink:to="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_E264EDF8862E18B563CE79987AE4BB9E" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeAssetFairValueGrossLiability_AACE6966C50F1A5975D579987AE4DD8A_negatedLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetFairValueGrossLiability_AACE6966C50F1A5975D579987AE4DD8A" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Derivative asset, gross amounts offset</link:label>
    <link:label id="lab_us-gaap_DerivativeAssetFairValueGrossLiability_AACE6966C50F1A5975D579987AE4DD8A_label_en-US" xlink:label="lab_us-gaap_DerivativeAssetFairValueGrossLiability_AACE6966C50F1A5975D579987AE4DD8A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset, Fair Value, Gross Liability</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeAssetFairValueGrossLiability" xlink:label="loc_us-gaap_DerivativeAssetFairValueGrossLiability_AACE6966C50F1A5975D579987AE4DD8A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeAssetFairValueGrossLiability_AACE6966C50F1A5975D579987AE4DD8A" xlink:to="lab_us-gaap_DerivativeAssetFairValueGrossLiability_AACE6966C50F1A5975D579987AE4DD8A" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeLiabilityFairValueGrossAsset_95E83A135533434AA68E79987AE48C50_negatedLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityFairValueGrossAsset_95E83A135533434AA68E79987AE48C50" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Derivative liability, gross amounts offset</link:label>
    <link:label id="lab_us-gaap_DerivativeLiabilityFairValueGrossAsset_95E83A135533434AA68E79987AE48C50_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityFairValueGrossAsset_95E83A135533434AA68E79987AE48C50" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Fair Value, Gross Asset</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeLiabilityFairValueGrossAsset" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_95E83A135533434AA68E79987AE48C50" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_95E83A135533434AA68E79987AE48C50" xlink:to="lab_us-gaap_DerivativeLiabilityFairValueGrossAsset_95E83A135533434AA68E79987AE48C50" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeAssets_882CB3A12E95CA7A728679987AE4D6DF_totalLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssets_882CB3A12E95CA7A728679987AE4D6DF" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Derivative asset, net asset</link:label>
    <link:label id="lab_us-gaap_DerivativeAssets_882CB3A12E95CA7A728679987AE4D6DF_label_en-US" xlink:label="lab_us-gaap_DerivativeAssets_882CB3A12E95CA7A728679987AE4D6DF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeAssets" xlink:label="loc_us-gaap_DerivativeAssets_882CB3A12E95CA7A728679987AE4D6DF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeAssets_882CB3A12E95CA7A728679987AE4D6DF" xlink:to="lab_us-gaap_DerivativeAssets_882CB3A12E95CA7A728679987AE4D6DF" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeLiabilities_A77BCAA3866E2C64F28E79987AE46ACD_totalLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilities_A77BCAA3866E2C64F28E79987AE46ACD" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Derivative liability, net liability</link:label>
    <link:label id="lab_us-gaap_DerivativeLiabilities_A77BCAA3866E2C64F28E79987AE46ACD_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilities_A77BCAA3866E2C64F28E79987AE46ACD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeLiabilities" xlink:label="loc_us-gaap_DerivativeLiabilities_A77BCAA3866E2C64F28E79987AE46ACD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLiabilities_A77BCAA3866E2C64F28E79987AE46ACD" xlink:to="lab_us-gaap_DerivativeLiabilities_A77BCAA3866E2C64F28E79987AE46ACD" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C4DFB1143D635CDEED8779987B03BE98_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C4DFB1143D635CDEED8779987B03BE98" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Measurements, Recurring and Nonrecurring [Table]</link:label>
    <link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C4DFB1143D635CDEED8779987B03BE98_label_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C4DFB1143D635CDEED8779987B03BE98" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Measurements, Recurring and Nonrecurring [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C4DFB1143D635CDEED8779987B03BE98" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C4DFB1143D635CDEED8779987B03BE98" xlink:to="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C4DFB1143D635CDEED8779987B03BE98" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueByMeasurementFrequencyAxis_7467D3250E9DF691E12779987B036394_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByMeasurementFrequencyAxis_7467D3250E9DF691E12779987B036394" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Measurement Frequency [Axis]</link:label>
    <link:label id="lab_us-gaap_FairValueByMeasurementFrequencyAxis_7467D3250E9DF691E12779987B036394_label_en-US" xlink:label="lab_us-gaap_FairValueByMeasurementFrequencyAxis_7467D3250E9DF691E12779987B036394" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Measurement Frequency [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_7467D3250E9DF691E12779987B036394" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_7467D3250E9DF691E12779987B036394" xlink:to="lab_us-gaap_FairValueByMeasurementFrequencyAxis_7467D3250E9DF691E12779987B036394" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueMeasurementFrequencyDomain_A162E718BC1417D2910779987B133B8E_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementFrequencyDomain_A162E718BC1417D2910779987B133B8E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value, Measurement Frequency [Domain]</link:label>
    <link:label id="lab_us-gaap_FairValueMeasurementFrequencyDomain_A162E718BC1417D2910779987B133B8E_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementFrequencyDomain_A162E718BC1417D2910779987B133B8E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Measurement Frequency [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_A162E718BC1417D2910779987B133B8E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_A162E718BC1417D2910779987B133B8E" xlink:to="lab_us-gaap_FairValueMeasurementFrequencyDomain_A162E718BC1417D2910779987B133B8E" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueMeasurementsRecurringMember_E60A668B57130E6824DC79987B132E87_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsRecurringMember_E60A668B57130E6824DC79987B132E87" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Recurring</link:label>
    <link:label id="lab_us-gaap_FairValueMeasurementsRecurringMember_E60A668B57130E6824DC79987B132E87_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsRecurringMember_E60A668B57130E6824DC79987B132E87" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Measurements, Recurring [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_E60A668B57130E6824DC79987B132E87" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueMeasurementsRecurringMember_E60A668B57130E6824DC79987B132E87" xlink:to="lab_us-gaap_FairValueMeasurementsRecurringMember_E60A668B57130E6824DC79987B132E87" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_6FA4BF41339FCB03094479987B13B0F5_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_6FA4BF41339FCB03094479987B13B0F5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Hierarchy and NAV [Axis]</link:label>
    <link:label id="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_6FA4BF41339FCB03094479987B13B0F5_label_en-US" xlink:label="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_6FA4BF41339FCB03094479987B13B0F5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Hierarchy and NAV [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_6FA4BF41339FCB03094479987B13B0F5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_6FA4BF41339FCB03094479987B13B0F5" xlink:to="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_6FA4BF41339FCB03094479987B13B0F5" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_89F42F4FE5BA2D781B6179987B137531_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_89F42F4FE5BA2D781B6179987B137531" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value, Measurements, Fair Value Hierarchy [Domain]</link:label>
    <link:label id="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_89F42F4FE5BA2D781B6179987B137531_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_89F42F4FE5BA2D781B6179987B137531" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Hierarchy and NAV [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_89F42F4FE5BA2D781B6179987B137531" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_89F42F4FE5BA2D781B6179987B137531" xlink:to="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_89F42F4FE5BA2D781B6179987B137531" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueInputsLevel1Member_24FAAB297CA86CE971DE79987B13A322_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel1Member_24FAAB297CA86CE971DE79987B13A322" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Level 1</link:label>
    <link:label id="lab_us-gaap_FairValueInputsLevel1Member_24FAAB297CA86CE971DE79987B13A322_label_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel1Member_24FAAB297CA86CE971DE79987B13A322" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Inputs, Level 1 [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_24FAAB297CA86CE971DE79987B13A322" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueInputsLevel1Member_24FAAB297CA86CE971DE79987B13A322" xlink:to="lab_us-gaap_FairValueInputsLevel1Member_24FAAB297CA86CE971DE79987B13A322" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueInputsLevel2Member_DFC7FFDC9A1BC36E692B79987B13E386_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel2Member_DFC7FFDC9A1BC36E692B79987B13E386" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Level 2</link:label>
    <link:label id="lab_us-gaap_FairValueInputsLevel2Member_DFC7FFDC9A1BC36E692B79987B13E386_label_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel2Member_DFC7FFDC9A1BC36E692B79987B13E386" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Inputs, Level 2 [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_DFC7FFDC9A1BC36E692B79987B13E386" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueInputsLevel2Member_DFC7FFDC9A1BC36E692B79987B13E386" xlink:to="lab_us-gaap_FairValueInputsLevel2Member_DFC7FFDC9A1BC36E692B79987B13E386" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueInputsLevel3Member_A554F3CAA8C61662845579987B139E21_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel3Member_A554F3CAA8C61662845579987B139E21" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Level 3</link:label>
    <link:label id="lab_us-gaap_FairValueInputsLevel3Member_A554F3CAA8C61662845579987B139E21_label_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel3Member_A554F3CAA8C61662845579987B139E21" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Inputs, Level 3 [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_A554F3CAA8C61662845579987B139E21" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueInputsLevel3Member_A554F3CAA8C61662845579987B139E21" xlink:to="lab_us-gaap_FairValueInputsLevel3Member_A554F3CAA8C61662845579987B139E21" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueByAssetClassAxis_C0ABEF78F0395759207779987B13C148_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByAssetClassAxis_C0ABEF78F0395759207779987B13C148" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Asset Class [Axis]</link:label>
    <link:label id="lab_us-gaap_FairValueByAssetClassAxis_C0ABEF78F0395759207779987B13C148_label_en-US" xlink:label="lab_us-gaap_FairValueByAssetClassAxis_C0ABEF78F0395759207779987B13C148" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Class [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByAssetClassAxis" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_C0ABEF78F0395759207779987B13C148" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_C0ABEF78F0395759207779987B13C148" xlink:to="lab_us-gaap_FairValueByAssetClassAxis_C0ABEF78F0395759207779987B13C148" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_CE12DE26B07B86668BA179987B138304_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_CE12DE26B07B86668BA179987B138304" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value by Asset Class [Domain]</link:label>
    <link:label id="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_CE12DE26B07B86668BA179987B138304_label_en-US" xlink:label="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_CE12DE26B07B86668BA179987B138304" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Class [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_CE12DE26B07B86668BA179987B138304" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_CE12DE26B07B86668BA179987B138304" xlink:to="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_CE12DE26B07B86668BA179987B138304" xlink:type="arc" />
    <link:label id="lab_us-gaap_MoneyMarketFundsMember_FEEA9ECC0100BDFD007379987B13C535_terseLabel_en-US" xlink:label="lab_us-gaap_MoneyMarketFundsMember_FEEA9ECC0100BDFD007379987B13C535" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Money market funds</link:label>
    <link:label id="lab_us-gaap_MoneyMarketFundsMember_FEEA9ECC0100BDFD007379987B13C535_label_en-US" xlink:label="lab_us-gaap_MoneyMarketFundsMember_FEEA9ECC0100BDFD007379987B13C535" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Money Market Funds [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MoneyMarketFundsMember" xlink:label="loc_us-gaap_MoneyMarketFundsMember_FEEA9ECC0100BDFD007379987B13C535" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MoneyMarketFundsMember_FEEA9ECC0100BDFD007379987B13C535" xlink:to="lab_us-gaap_MoneyMarketFundsMember_FEEA9ECC0100BDFD007379987B13C535" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1433B3B89597B44BDF5079987B13EF10_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1433B3B89597B44BDF5079987B13EF10" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]</link:label>
    <link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1433B3B89597B44BDF5079987B13EF10_label_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1433B3B89597B44BDF5079987B13EF10" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1433B3B89597B44BDF5079987B13EF10" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1433B3B89597B44BDF5079987B13EF10" xlink:to="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1433B3B89597B44BDF5079987B13EF10" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetsFairValueDisclosureAbstract_2E43B56F50C4289128DC79987B13799F_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsFairValueDisclosureAbstract_2E43B56F50C4289128DC79987B13799F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Assets:</link:label>
    <link:label id="lab_us-gaap_AssetsFairValueDisclosureAbstract_2E43B56F50C4289128DC79987B13799F_label_en-US" xlink:label="lab_us-gaap_AssetsFairValueDisclosureAbstract_2E43B56F50C4289128DC79987B13799F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets, Fair Value Disclosure [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetsFairValueDisclosureAbstract" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_2E43B56F50C4289128DC79987B13799F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_2E43B56F50C4289128DC79987B13799F" xlink:to="lab_us-gaap_AssetsFairValueDisclosureAbstract_2E43B56F50C4289128DC79987B13799F" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetsFairValueDisclosure_15B4828E521E832B585E79987B13B886_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsFairValueDisclosure_15B4828E521E832B585E79987B13B886" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total assets</link:label>
    <link:label id="lab_us-gaap_AssetsFairValueDisclosure_15B4828E521E832B585E79987B13B886_label_en-US" xlink:label="lab_us-gaap_AssetsFairValueDisclosure_15B4828E521E832B585E79987B13B886" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets, Fair Value Disclosure</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetsFairValueDisclosure" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_15B4828E521E832B585E79987B13B886" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_15B4828E521E832B585E79987B13B886" xlink:to="lab_us-gaap_AssetsFairValueDisclosure_15B4828E521E832B585E79987B13B886" xlink:type="arc" />
    <link:label id="lab_us-gaap_LiabilitiesFairValueDisclosureAbstract_55388633A05B0DA11FA579987B13B87F_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesFairValueDisclosureAbstract_55388633A05B0DA11FA579987B13B87F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Liabilities:</link:label>
    <link:label id="lab_us-gaap_LiabilitiesFairValueDisclosureAbstract_55388633A05B0DA11FA579987B13B87F_label_en-US" xlink:label="lab_us-gaap_LiabilitiesFairValueDisclosureAbstract_55388633A05B0DA11FA579987B13B87F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities, Fair Value Disclosure [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_55388633A05B0DA11FA579987B13B87F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_55388633A05B0DA11FA579987B13B87F" xlink:to="lab_us-gaap_LiabilitiesFairValueDisclosureAbstract_55388633A05B0DA11FA579987B13B87F" xlink:type="arc" />
    <link:label id="lab_us-gaap_LiabilitiesFairValueDisclosure_7E3BB39C37E37A3A1D2B79987B13807B_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesFairValueDisclosure_7E3BB39C37E37A3A1D2B79987B13807B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total liabilities</link:label>
    <link:label id="lab_us-gaap_LiabilitiesFairValueDisclosure_7E3BB39C37E37A3A1D2B79987B13807B_label_en-US" xlink:label="lab_us-gaap_LiabilitiesFairValueDisclosure_7E3BB39C37E37A3A1D2B79987B13807B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financial and Nonfinancial Liabilities, Fair Value Disclosure</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosure" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_7E3BB39C37E37A3A1D2B79987B13807B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosure_7E3BB39C37E37A3A1D2B79987B13807B" xlink:to="lab_us-gaap_LiabilitiesFairValueDisclosure_7E3BB39C37E37A3A1D2B79987B13807B" xlink:type="arc" />
    <link:label id="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_38B3C399ADCB87AEFA647A57D5F49241_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_38B3C399ADCB87AEFA647A57D5F49241" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table]</link:label>
    <link:label id="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_38B3C399ADCB87AEFA647A57D5F49241_label_en-US" xlink:label="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_38B3C399ADCB87AEFA647A57D5F49241" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_38B3C399ADCB87AEFA647A57D5F49241" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_38B3C399ADCB87AEFA647A57D5F49241" xlink:to="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_38B3C399ADCB87AEFA647A57D5F49241" xlink:type="arc" />
    <link:label id="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_6217D29C44BDEE9F25597A57D5F4D884_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_6217D29C44BDEE9F25597A57D5F4D884" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]</link:label>
    <link:label id="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_6217D29C44BDEE9F25597A57D5F4D884_label_en-US" xlink:label="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_6217D29C44BDEE9F25597A57D5F4D884" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_6217D29C44BDEE9F25597A57D5F4D884" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_6217D29C44BDEE9F25597A57D5F4D884" xlink:to="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_6217D29C44BDEE9F25597A57D5F4D884" xlink:type="arc" />
    <link:label id="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_D4BFA8FB1AFF95C8D1677A57D5F53E31_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_D4BFA8FB1AFF95C8D1677A57D5F53E31" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]</link:label>
    <link:label id="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_D4BFA8FB1AFF95C8D1677A57D5F53E31_label_en-US" xlink:label="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_D4BFA8FB1AFF95C8D1677A57D5F53E31" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_D4BFA8FB1AFF95C8D1677A57D5F53E31" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_D4BFA8FB1AFF95C8D1677A57D5F53E31" xlink:to="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_D4BFA8FB1AFF95C8D1677A57D5F53E31" xlink:type="arc" />
    <link:label id="lab_us-gaap_RevenueRemainingPerformanceObligation_9FA157192296D32B70717A57D5F5E8A6_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueRemainingPerformanceObligation_9FA157192296D32B70717A57D5F5E8A6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Remaining performance obligation</link:label>
    <link:label id="lab_us-gaap_RevenueRemainingPerformanceObligation_9FA157192296D32B70717A57D5F5E8A6_label_en-US" xlink:label="lab_us-gaap_RevenueRemainingPerformanceObligation_9FA157192296D32B70717A57D5F5E8A6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue, Remaining Performance Obligation, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligation" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_9FA157192296D32B70717A57D5F5E8A6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligation_9FA157192296D32B70717A57D5F5E8A6" xlink:to="lab_us-gaap_RevenueRemainingPerformanceObligation_9FA157192296D32B70717A57D5F5E8A6" xlink:type="arc" />
    <link:label id="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_8AC9961D3AE43DF70F887A58B15967F1_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_8AC9961D3AE43DF70F887A58B15967F1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Remaining performance obligation satisfaction period</link:label>
    <link:label id="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_8AC9961D3AE43DF70F887A58B15967F1_label_en-US" xlink:label="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_8AC9961D3AE43DF70F887A58B15967F1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_8AC9961D3AE43DF70F887A58B15967F1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_8AC9961D3AE43DF70F887A58B15967F1" xlink:to="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_8AC9961D3AE43DF70F887A58B15967F1" xlink:type="arc" />
    <link:label id="lab_us-gaap_VariableInterestEntityDisclosureTextBlock_C30DE715209F403A90E1989688DB6853_terseLabel_en-US" xlink:label="lab_us-gaap_VariableInterestEntityDisclosureTextBlock_C30DE715209F403A90E1989688DB6853" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Oasis Midstream Partners LP</link:label>
    <link:label id="lab_us-gaap_VariableInterestEntityDisclosureTextBlock_C30DE715209F403A90E1989688DB6853_label_en-US" xlink:label="lab_us-gaap_VariableInterestEntityDisclosureTextBlock_C30DE715209F403A90E1989688DB6853" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Interest Entity Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableInterestEntityDisclosureTextBlock" xlink:label="loc_us-gaap_VariableInterestEntityDisclosureTextBlock_C30DE715209F403A90E1989688DB6853" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableInterestEntityDisclosureTextBlock_C30DE715209F403A90E1989688DB6853" xlink:to="lab_us-gaap_VariableInterestEntityDisclosureTextBlock_C30DE715209F403A90E1989688DB6853" xlink:type="arc" />
  </link:labelLink>
</link:linkbase>
