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  <xsd:element abstract="true" id="oas_ProducedWaterMember" name="ProducedWaterMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="oas_ProvedOilAndGasPropertiesMember" name="ProvedOilAndGasPropertiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="oas_ProvedOilAndGasPropertiesNet" name="ProvedOilAndGasPropertiesNet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="oas_PurchasedGasSalesMember" name="PurchasedGasSalesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="oas_PurchasedOilSalesMember" name="PurchasedOilSalesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="oas_RevenuesPayableAndProductionTaxesCurrent" name="RevenuesPayableAndProductionTaxesCurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="oas_RightsReceivedForEachPerformanceShareUnit1" name="RightsReceivedForEachPerformanceShareUnit1" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="oas_RisksandUncertaintiesPolicyPolicyTextBlock" name="RisksandUncertaintiesPolicyPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="oas_SeniorSecuredRevolvingLineofCreditMember" name="SeniorSecuredRevolvingLineofCreditMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="oas_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVolumeWeightedAveragePrice" name="SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVolumeWeightedAveragePrice" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="oas_StockAwardsandPerformanceStockUnitsMember" name="StockAwardsandPerformanceStockUnitsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="oas_TheCreditAgreementMember" name="TheCreditAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="oas_TwoThousandEighteenBasisSwapsMember" name="TwoThousandEighteenBasisSwapsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="oas_TwoThousandEighteenSwapsMember" name="TwoThousandEighteenSwapsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="oas_TwoThousandEighteenTwoWayCollarsMember" name="TwoThousandEighteenTwoWayCollarsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="oas_TwoThousandNineteenBasisSwapsMemberMember" name="TwoThousandNineteenBasisSwapsMemberMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="oas_TwoThousandNineteenNotesMember" name="TwoThousandNineteenNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="oas_TwoThousandNineteenSwapsMember" name="TwoThousandNineteenSwapsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="oas_TwoThousandNineteenThreeWayCollarsMember" name="TwoThousandNineteenThreeWayCollarsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="oas_TwoThousandNineteenTwowayCollarsMember" name="TwoThousandNineteenTwowayCollarsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="oas_TwoThousandTwentyOneNotesMember" name="TwoThousandTwentyOneNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="oas_TwoThousandTwentySixNotesMember" name="TwoThousandTwentySixNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="oas_TwoThousandTwentySwapMember" name="TwoThousandTwentySwapMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="oas_TwoThousandTwentyThreeNotesMember" name="TwoThousandTwentyThreeNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="oas_TwoThousandTwentyThreeWayCollarsMember" name="TwoThousandTwentyThreeWayCollarsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="oas_TwoThousandTwentyTwoNotesMember" name="TwoThousandTwentyTwoNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="oas_TwoThousandTwentyTwoWayCollarsMember" name="TwoThousandTwentyTwoWayCollarsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="oas_UnsecuredSeniorNotesMember" name="UnsecuredSeniorNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="oas_WaterServicesMember" name="WaterServicesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="oas_WellServicingMember" name="WellServicingMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="oas_WillistonNonOpDivestitureMember" name="WillistonNonOpDivestitureMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
</xsd:schema>
