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    <link:label id="lab_gpor_OhioGatheringCompanyLLCandOhioCondensateCompanyLLCMember_855EB27418E57BFDCDD847F7CCA0788C_terseLabel_en-US" xlink:label="lab_gpor_OhioGatheringCompanyLLCandOhioCondensateCompanyLLCMember_855EB27418E57BFDCDD847F7CCA0788C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Ohio Gathering Company, LLC and Ohio Condensate Company, LLC</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsidiariesMember" xlink:label="loc_us-gaap_SubsidiariesMember_4AFBD0D26E1CC6294AAF47F7CCA0103A" xlink:type="locator" />
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    <link:label id="lab_gpor_MidmarGasLlcMember_4419C3A7838384E33AE547F7CCA0A0EB_terseLabel_en-US" xlink:label="lab_gpor_MidmarGasLlcMember_4419C3A7838384E33AE547F7CCA0A0EB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">MidMar Gas LLC</link:label>
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    <link:loc xlink:href="gpor-20160630.xsd#gpor_RiceEnergyIncMember" xlink:label="loc_gpor_RiceEnergyIncMember_93C1680A4A7A9502700F47F7CCA153F3" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_422A08FD649C442A501228DA2E56E19B_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_422A08FD649C442A501228DA2E56E19B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Type [Domain]</link:label>
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    <link:label id="lab_gpor_ProvedPropertiesMember_D1B76BB5A669D3D4420728DA2E56DB82_terseLabel_en-US" xlink:label="lab_gpor_ProvedPropertiesMember_D1B76BB5A669D3D4420728DA2E56DB82" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proved</link:label>
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    <link:loc xlink:href="gpor-20160630.xsd#gpor_ProvedPropertiesMember" xlink:label="loc_gpor_ProvedPropertiesMember_D1B76BB5A669D3D4420728DA2E56DB82" xlink:type="locator" />
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    <link:label id="lab_us-gaap_BusinessAcquisitionLineItems_0433C2FB1A47D88706B328DA2E56AFC4_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionLineItems_0433C2FB1A47D88706B328DA2E56AFC4" 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_0433C2FB1A47D88706B328DA2E56AFC4_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionLineItems_0433C2FB1A47D88706B328DA2E56AFC4" 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/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_0433C2FB1A47D88706B328DA2E56AFC4" xlink:type="locator" />
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    <link:label id="lab_us-gaap_BusinessCombinationConsiderationTransferred1_A1A619B453307767A87928DA2E565554_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationConsiderationTransferred1_A1A619B453307767A87928DA2E565554" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Purchase price</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_A1A619B453307767A87928DA2E565554" xlink:type="locator" />
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    <link:label id="lab_gpor_GasAndOilAreaNet_1BFB1A32BF1AC4DBF35E28DA2E561DD2_terseLabel_en-US" xlink:label="lab_gpor_GasAndOilAreaNet_1BFB1A32BF1AC4DBF35E28DA2E561DD2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gas and oil acreage, net</link:label>
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    <link:loc xlink:href="gpor-20160630.xsd#gpor_GasAndOilAreaNet" xlink:label="loc_gpor_GasAndOilAreaNet_1BFB1A32BF1AC4DBF35E28DA2E561DD2" xlink:type="locator" />
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    <link:label id="lab_gpor_GasAndOilAreaGrossAndNet_92CA71609CDF56E58F3528DA2E56C68C_terseLabel_en-US" xlink:label="lab_gpor_GasAndOilAreaGrossAndNet_92CA71609CDF56E58F3528DA2E56C68C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gross and net acres acquired</link:label>
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    <link:loc xlink:href="gpor-20160630.xsd#gpor_GasAndOilAreaGrossAndNet" xlink:label="loc_gpor_GasAndOilAreaGrossAndNet_92CA71609CDF56E58F3528DA2E56C68C" xlink:type="locator" />
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    <link:label id="lab_gpor_GasAndOilAreaGross_3BB87C338748B535CAFB28DA2E5676A8_terseLabel_en-US" xlink:label="lab_gpor_GasAndOilAreaGross_3BB87C338748B535CAFB28DA2E5676A8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gas and oil acreage, gross</link:label>
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    <link:label id="lab_gpor_GasAndOilAreaGross_3BB87C338748B535CAFB28DA2E5676A8_documentation_en-US" xlink:label="lab_gpor_GasAndOilAreaGross_3BB87C338748B535CAFB28DA2E5676A8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Gas And Oil Area, Gross</link:label>
    <link:loc xlink:href="gpor-20160630.xsd#gpor_GasAndOilAreaGross" xlink:label="loc_gpor_GasAndOilAreaGross_3BB87C338748B535CAFB28DA2E5676A8" xlink:type="locator" />
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    <link:label id="lab_gpor_OilAndGasDeliveryCommitmentsAndContractsDailyProductionVolume_4742910542E1AAF1F56928DA2E56D52D_terseLabel_en-US" xlink:label="lab_gpor_OilAndGasDeliveryCommitmentsAndContractsDailyProductionVolume_4742910542E1AAF1F56928DA2E56D52D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Daily production of well acquired</link:label>
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    <link:label id="lab_gpor_ProductiveOilAndGasWellsNumberOfWellsGross_552DA09567513C03865828DA2E56F303_terseLabel_en-US" xlink:label="lab_gpor_ProductiveOilAndGasWellsNumberOfWellsGross_552DA09567513C03865828DA2E56F303" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gross wells acquired</link:label>
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    <link:label id="lab_gpor_GasGatheringTransportationLength_2C6296A5371F1B5B051328DA2E564110_terseLabel_en-US" xlink:label="lab_gpor_GasGatheringTransportationLength_2C6296A5371F1B5B051328DA2E564110" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gas gathering system (in miles)</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_D3E6CA79B59129241B5151FFBC7C7163_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_D3E6CA79B59129241B5151FFBC7C7163" 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>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_9C7B8591B376B36A059C51FFBC7D1A7C" xlink:type="locator" />
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    <link:label id="lab_gpor_DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations_90D1E142230CFC23F7E051FFBC7D7011_terseLabel_en-US" xlink:label="lab_gpor_DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations_90D1E142230CFC23F7E051FFBC7D7011" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred income tax benefit</link:label>
    <link:label id="lab_gpor_DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations_90D1E142230CFC23F7E051FFBC7D7011_label_en-US" xlink:label="lab_gpor_DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations_90D1E142230CFC23F7E051FFBC7D7011" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Income Tax Expense (Benefit) Including Discontinued Operations</link:label>
    <link:label id="lab_gpor_DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations_90D1E142230CFC23F7E051FFBC7D7011_documentation_en-US" xlink:label="lab_gpor_DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations_90D1E142230CFC23F7E051FFBC7D7011" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Deferred Income Tax Expense (Benefit) Including Discontinued Operations</link:label>
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    <link:label id="lab_us-gaap_AmortizationOfDebtDiscountPremium_383EAC77603BBA5465AF51FFBC7E2FE9_terseLabel_en-US" xlink:label="lab_us-gaap_AmortizationOfDebtDiscountPremium_383EAC77603BBA5465AF51FFBC7E2FE9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization of note discount and premium</link:label>
    <link:label id="lab_us-gaap_AmortizationOfDebtDiscountPremium_383EAC77603BBA5465AF51FFBC7E2FE9_label_en-US" xlink:label="lab_us-gaap_AmortizationOfDebtDiscountPremium_383EAC77603BBA5465AF51FFBC7E2FE9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amortization of Debt Discount (Premium)</link:label>
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    <link:label id="lab_gpor_IncreaseDecreaseInAssetRetirementObligation_797F701D6CEBC49ADD2551FFBC7EDB98_terseLabel_en-US" xlink:label="lab_gpor_IncreaseDecreaseInAssetRetirementObligation_797F701D6CEBC49ADD2551FFBC7EDB98" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Settlement of asset retirement obligation</link:label>
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    <link:label id="lab_gpor_IncreaseDecreaseInAssetRetirementObligation_797F701D6CEBC49ADD2551FFBC7EDB98_documentation_en-US" xlink:label="lab_gpor_IncreaseDecreaseInAssetRetirementObligation_797F701D6CEBC49ADD2551FFBC7EDB98" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Increase (Decrease) In Asset Retirement Obligation</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_58F3613D1DCE33D70DDB51FFBC7ECFF5_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_58F3613D1DCE33D70DDB51FFBC7ECFF5" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by operating activities</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_5AB962107BCE3C139E0751FFBC7F5D50_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_5AB962107BCE3C139E0751FFBC7F5D50" 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_5AB962107BCE3C139E0751FFBC7F5D50_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_5AB962107BCE3C139E0751FFBC7F5D50" 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/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_5AB962107BCE3C139E0751FFBC7F5D50" xlink:type="locator" />
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    <link:label id="lab_gpor_ProceedsFromEscrowAccounts_568A08E3CD19E55719DE51FFBC7F8C0E_terseLabel_en-US" xlink:label="lab_gpor_ProceedsFromEscrowAccounts_568A08E3CD19E55719DE51FFBC7F8C0E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deductions to cash held in escrow</link:label>
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    <link:loc xlink:href="gpor-20160630.xsd#gpor_ProceedsFromEscrowAccounts" xlink:label="loc_gpor_ProceedsFromEscrowAccounts_568A08E3CD19E55719DE51FFBC7F8C0E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment_1E734B15A34644545F3851FFBC7FEB3B_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment_1E734B15A34644545F3851FFBC7FEB3B" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Additions to other property and equipment</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment_1E734B15A34644545F3851FFBC7FEB3B" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireOilAndGasProperty" xlink:label="loc_us-gaap_PaymentsToAcquireOilAndGasProperty_6A25B6170D4EDB05C97F51FFBC7FAA58" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AssetsCurrentAbstract_77113CEF8C3C64B441B42EF523B7EE9F_label_en-US" xlink:label="lab_us-gaap_AssetsCurrentAbstract_77113CEF8C3C64B441B42EF523B7EE9F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets, Current [Abstract]</link:label>
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    <link:label id="lab_gpor_RefinancedBuildingLoanMember_D3BED4A12DE1101E92C54E7708336441_terseLabel_en-US" xlink:label="lab_gpor_RefinancedBuildingLoanMember_D3BED4A12DE1101E92C54E7708336441" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Refinanced Building Loan</link:label>
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    <link:label id="lab_gpor_BuildingLoansMember_3E6D07A7A870F1E2B9634E770835E4CD_terseLabel_en-US" xlink:label="lab_gpor_BuildingLoansMember_3E6D07A7A870F1E2B9634E770835E4CD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Building loan</link:label>
    <link:label id="lab_gpor_BuildingLoansMember_3E6D07A7A870F1E2B9634E770835E4CD_label_en-US" xlink:label="lab_gpor_BuildingLoansMember_3E6D07A7A870F1E2B9634E770835E4CD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Building Loans [Member]</link:label>
    <link:label id="lab_gpor_BuildingLoansMember_3E6D07A7A870F1E2B9634E770835E4CD_documentation_en-US" xlink:label="lab_gpor_BuildingLoansMember_3E6D07A7A870F1E2B9634E770835E4CD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Building Loans [Member]</link:label>
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    <link:label id="lab_gpor_A7.75SeniorNotesMember_9801DC0DD36366CCCF3F4E770835BEDE_terseLabel_en-US" xlink:label="lab_gpor_A7.75SeniorNotesMember_9801DC0DD36366CCCF3F4E770835BEDE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">7.75% Senior Notes</link:label>
    <link:label id="lab_gpor_A7.75SeniorNotesMember_9801DC0DD36366CCCF3F4E770835BEDE_label_en-US" xlink:label="lab_gpor_A7.75SeniorNotesMember_9801DC0DD36366CCCF3F4E770835BEDE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">7.75% Senior Notes [Member]</link:label>
    <link:label id="lab_gpor_A7.75SeniorNotesMember_9801DC0DD36366CCCF3F4E770835BEDE_documentation_en-US" xlink:label="lab_gpor_A7.75SeniorNotesMember_9801DC0DD36366CCCF3F4E770835BEDE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">7.75% Senior Notes [Member]</link:label>
    <link:loc xlink:href="gpor-20160630.xsd#gpor_A7.75SeniorNotesMember" xlink:label="loc_gpor_A7.75SeniorNotesMember_9801DC0DD36366CCCF3F4E770835BEDE" xlink:type="locator" />
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    <link:label id="lab_gpor_InterestCostCapitalizedUndevelopedProperties_7A5DB1A4E096F2BAE3174E770836A00C_terseLabel_en-US" xlink:label="lab_gpor_InterestCostCapitalizedUndevelopedProperties_7A5DB1A4E096F2BAE3174E770836A00C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest cost capitalized, undeveloped properties</link:label>
    <link:label id="lab_gpor_InterestCostCapitalizedUndevelopedProperties_7A5DB1A4E096F2BAE3174E770836A00C_label_en-US" xlink:label="lab_gpor_InterestCostCapitalizedUndevelopedProperties_7A5DB1A4E096F2BAE3174E770836A00C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Cost Capitalized, Undeveloped Properties</link:label>
    <link:label id="lab_gpor_InterestCostCapitalizedUndevelopedProperties_7A5DB1A4E096F2BAE3174E770836A00C_documentation_en-US" xlink:label="lab_gpor_InterestCostCapitalizedUndevelopedProperties_7A5DB1A4E096F2BAE3174E770836A00C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Interest Cost Capitalized, Undeveloped Properties</link:label>
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    <link:label id="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_613B39476FB22C31108C4E7708366AFE_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_613B39476FB22C31108C4E7708366AFE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowing capacity</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_613B39476FB22C31108C4E7708366AFE_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_613B39476FB22C31108C4E7708366AFE" 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/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_613B39476FB22C31108C4E7708366AFE" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_F05C87D55CB07FFE6F944E770837BAFA_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_F05C87D55CB07FFE6F944E770837BAFA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Remaining borrowing capacity</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_F05C87D55CB07FFE6F944E770837BAFA_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_F05C87D55CB07FFE6F944E770837BAFA" 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/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_F05C87D55CB07FFE6F944E770837BAFA" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum_15ED831265D4F5E0C7354E770837C1ED_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum_15ED831265D4F5E0C7354E770837C1ED" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Applicable rate, minimum, percent</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum_15ED831265D4F5E0C7354E770837C1ED_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum_15ED831265D4F5E0C7354E770837C1ED" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum_15ED831265D4F5E0C7354E770837C1ED" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum_15ED831265D4F5E0C7354E770837C1ED" xlink:to="lab_us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum_15ED831265D4F5E0C7354E770837C1ED" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum_1A004DBEB4F2CEF64D8A4E77083772AC_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum_1A004DBEB4F2CEF64D8A4E77083772AC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Applicable rate, maximum, percent</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum_1A004DBEB4F2CEF64D8A4E77083772AC_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum_1A004DBEB4F2CEF64D8A4E77083772AC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum_1A004DBEB4F2CEF64D8A4E77083772AC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum_1A004DBEB4F2CEF64D8A4E77083772AC" xlink:to="lab_us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum_1A004DBEB4F2CEF64D8A4E77083772AC" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_4C6E298D78BF5915AD9A4E77083707ED_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_4C6E298D78BF5915AD9A4E77083707ED" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basis spread, percent</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_4C6E298D78BF5915AD9A4E77083707ED_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_4C6E298D78BF5915AD9A4E77083707ED" 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/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_4C6E298D78BF5915AD9A4E77083707ED" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_4C6E298D78BF5915AD9A4E77083707ED" xlink:to="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_4C6E298D78BF5915AD9A4E77083707ED" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_DD0830B0A5D608538EE04E7708371A15_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_DD0830B0A5D608538EE04E7708371A15" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, description of variable rate basis</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_DD0830B0A5D608538EE04E7708371A15_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_DD0830B0A5D608538EE04E7708371A15" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Description of Variable Rate Basis</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentDescriptionOfVariableRateBasis" xlink:label="loc_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_DD0830B0A5D608538EE04E7708371A15" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_DD0830B0A5D608538EE04E7708371A15" xlink:to="lab_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_DD0830B0A5D608538EE04E7708371A15" xlink:type="arc" />
    <link:label id="lab_gpor_DebtInstrumentDispositionCostsMaximumExpensesAllowed_B0A87932C20458A952634E7708378F8B_terseLabel_en-US" xlink:label="lab_gpor_DebtInstrumentDispositionCostsMaximumExpensesAllowed_B0A87932C20458A952634E7708378F8B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disposition costs, maximum expenses allowed</link:label>
    <link:label id="lab_gpor_DebtInstrumentDispositionCostsMaximumExpensesAllowed_B0A87932C20458A952634E7708378F8B_label_en-US" xlink:label="lab_gpor_DebtInstrumentDispositionCostsMaximumExpensesAllowed_B0A87932C20458A952634E7708378F8B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Disposition Costs Maximum Expenses Allowed</link:label>
    <link:label id="lab_gpor_DebtInstrumentDispositionCostsMaximumExpensesAllowed_B0A87932C20458A952634E7708378F8B_documentation_en-US" xlink:label="lab_gpor_DebtInstrumentDispositionCostsMaximumExpensesAllowed_B0A87932C20458A952634E7708378F8B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt Instrument, Disposition Costs Maximum Expenses Allowed</link:label>
    <link:loc xlink:href="gpor-20160630.xsd#gpor_DebtInstrumentDispositionCostsMaximumExpensesAllowed" xlink:label="loc_gpor_DebtInstrumentDispositionCostsMaximumExpensesAllowed_B0A87932C20458A952634E7708378F8B" xlink:type="locator" />
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    <link:label id="lab_gpor_DebtInstrumentCovenantComplianceFutureEarningsBeforeIncomeTaxDepreciationDepletionAmortizationandExplorationExpensesRatio_8397D14A9255C9F430B74E7708370F69_terseLabel_en-US" xlink:label="lab_gpor_DebtInstrumentCovenantComplianceFutureEarningsBeforeIncomeTaxDepreciationDepletionAmortizationandExplorationExpensesRatio_8397D14A9255C9F430B74E7708370F69" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt covenant ratio for future EBITDAX</link:label>
    <link:label id="lab_gpor_DebtInstrumentCovenantComplianceFutureEarningsBeforeIncomeTaxDepreciationDepletionAmortizationandExplorationExpensesRatio_8397D14A9255C9F430B74E7708370F69_label_en-US" xlink:label="lab_gpor_DebtInstrumentCovenantComplianceFutureEarningsBeforeIncomeTaxDepreciationDepletionAmortizationandExplorationExpensesRatio_8397D14A9255C9F430B74E7708370F69" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Covenant Compliance, Future Earnings Before Income Tax Depreciation Depletion Amortization and Exploration Expenses, Ratio</link:label>
    <link:label id="lab_gpor_DebtInstrumentCovenantComplianceFutureEarningsBeforeIncomeTaxDepreciationDepletionAmortizationandExplorationExpensesRatio_8397D14A9255C9F430B74E7708370F69_documentation_en-US" xlink:label="lab_gpor_DebtInstrumentCovenantComplianceFutureEarningsBeforeIncomeTaxDepreciationDepletionAmortizationandExplorationExpensesRatio_8397D14A9255C9F430B74E7708370F69" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt Instrument, Covenant Compliance, Future Earnings Before Income Tax Depreciation Depletion Amortization and Exploration Expenses, Ratio</link:label>
    <link:loc xlink:href="gpor-20160630.xsd#gpor_DebtInstrumentCovenantComplianceFutureEarningsBeforeIncomeTaxDepreciationDepletionAmortizationandExplorationExpensesRatio" xlink:label="loc_gpor_DebtInstrumentCovenantComplianceFutureEarningsBeforeIncomeTaxDepreciationDepletionAmortizationandExplorationExpensesRatio_8397D14A9255C9F430B74E7708370F69" xlink:type="locator" />
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    <link:label id="lab_gpor_DebtInstrumentCovenantComplianceEarningsBeforeIncomeTaxDepreciationDepletionAmortizationAndExplorationExpensesRatio_7D495E873536D27FB3274E770837B4A5_terseLabel_en-US" xlink:label="lab_gpor_DebtInstrumentCovenantComplianceEarningsBeforeIncomeTaxDepreciationDepletionAmortizationAndExplorationExpensesRatio_7D495E873536D27FB3274E770837B4A5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt covenant ratio for EBITDAX</link:label>
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    <link:label id="lab_us-gaap_LongTermDebt_DFC411B2B0275CD61FF64E770837BA9A_verboseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebt_DFC411B2B0275CD61FF64E770837BA9A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Building loan outstanding amount of building loan refinanced</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentPeriodicPayment_EA303880995838CEAB7F4E7708379F6E_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentPeriodicPayment_EA303880995838CEAB7F4E7708379F6E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loan, periodic payment</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_FAC4F0C76B015F3FC5F74E7708378F04_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount_FAC4F0C76B015F3FC5F74E7708378F04" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Gross</link:label>
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    <link:label id="lab_gpor_DebtInstrumentOutstandingNotesRequiredForRedemption_CC89CA0C6EAE895D47234E7708389827_terseLabel_en-US" xlink:label="lab_gpor_DebtInstrumentOutstandingNotesRequiredForRedemption_CC89CA0C6EAE895D47234E7708389827" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of notes required to be outstanding for redemption, percent</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentInterestRateEffectivePercentage_A6EEF4273F09A7D637134E770838380C_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateEffectivePercentage_A6EEF4273F09A7D637134E770838380C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Effective interest rate, percent</link:label>
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    <link:label id="lab_gpor_DebtInstrumentDiscountIssuePricePercentage_350E395A4A152E20D0E34E7708380EA6_terseLabel_en-US" xlink:label="lab_gpor_DebtInstrumentDiscountIssuePricePercentage_350E395A4A152E20D0E34E7708380EA6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Discount issue price, price, percent</link:label>
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    <link:label id="lab_gpor_DebtInstrumentPremiumIssuePricePercentage_01F1588472CC7AA69EC64E770838A7BF_terseLabel_en-US" xlink:label="lab_gpor_DebtInstrumentPremiumIssuePricePercentage_01F1588472CC7AA69EC64E770838A7BF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Premium issue price, percent</link:label>
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    <link:loc xlink:href="gpor-20160630.xsd#gpor_DebtInstrumentPremiumIssuePricePercentage" xlink:label="loc_gpor_DebtInstrumentPremiumIssuePricePercentage_01F1588472CC7AA69EC64E770838A7BF" xlink:type="locator" />
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    <link:label id="lab_gpor_LineofCreditFacilityRequiredMinimumDownPayment_F2A5903BB14A6937185A4E770838B4DC_terseLabel_en-US" xlink:label="lab_gpor_LineofCreditFacilityRequiredMinimumDownPayment_F2A5903BB14A6937185A4E770838B4DC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Line of credit facility, required minimum down payment, percent</link:label>
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    <link:label id="lab_us-gaap_FurnitureAndFixturesGross_9B8C27736EFCC3D4857EC18B1CE5F3EF_verboseLabel_en-US" xlink:label="lab_us-gaap_FurnitureAndFixturesGross_9B8C27736EFCC3D4857EC18B1CE5F3EF" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Office furniture and fixtures</link:label>
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    <link:loc xlink:href="gpor-20160630.xsd#gpor_AccumulatedDeprecationDepletionAmortizationandImpairmentPropertyPlantandEquipment" xlink:label="loc_gpor_AccumulatedDeprecationDepletionAmortizationandImpairmentPropertyPlantandEquipment_5FECEF8831DB91855BF7C18B1CE5C976" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FinancialInstrumentAxis_3D3A84CFE51C2FCC10ED50D603C82A4A_terseLabel_en-US" xlink:label="lab_us-gaap_FinancialInstrumentAxis_3D3A84CFE51C2FCC10ED50D603C82A4A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financial Instrument [Axis]</link:label>
    <link:label id="lab_us-gaap_FinancialInstrumentAxis_3D3A84CFE51C2FCC10ED50D603C82A4A_label_en-US" xlink:label="lab_us-gaap_FinancialInstrumentAxis_3D3A84CFE51C2FCC10ED50D603C82A4A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financial Instrument [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="loc_us-gaap_FinancialInstrumentAxis_3D3A84CFE51C2FCC10ED50D603C82A4A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_6284DA03C7864E880B2050D603CD8DA5_terseLabel_en-US" xlink:label="lab_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_6284DA03C7864E880B2050D603CD8DA5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financial Instruments [Domain]</link:label>
    <link:label id="lab_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_6284DA03C7864E880B2050D603CD8DA5_label_en-US" xlink:label="lab_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_6284DA03C7864E880B2050D603CD8DA5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financial Instruments [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_6284DA03C7864E880B2050D603CD8DA5" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SwapMember_EBAD2F739EC2F80116E850D603CD3E23_terseLabel_en-US" xlink:label="lab_us-gaap_SwapMember_EBAD2F739EC2F80116E850D603CD3E23" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Swap</link:label>
    <link:label id="lab_us-gaap_SwapMember_EBAD2F739EC2F80116E850D603CD3E23_label_en-US" xlink:label="lab_us-gaap_SwapMember_EBAD2F739EC2F80116E850D603CD3E23" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Swap [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SwapMember" xlink:label="loc_us-gaap_SwapMember_EBAD2F739EC2F80116E850D603CD3E23" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SwapMember_EBAD2F739EC2F80116E850D603CD3E23" xlink:to="lab_us-gaap_SwapMember_EBAD2F739EC2F80116E850D603CD3E23" xlink:type="arc" />
    <link:label id="lab_us-gaap_OptionIndexedToIssuersEquityEquityAxis_83B88DB8BB6B01A45B8750D603CD0BD4_terseLabel_en-US" xlink:label="lab_us-gaap_OptionIndexedToIssuersEquityEquityAxis_83B88DB8BB6B01A45B8750D603CD0BD4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Option Indexed to Issuer's Equity [Axis]</link:label>
    <link:label id="lab_us-gaap_OptionIndexedToIssuersEquityEquityAxis_83B88DB8BB6B01A45B8750D603CD0BD4_label_en-US" xlink:label="lab_us-gaap_OptionIndexedToIssuersEquityEquityAxis_83B88DB8BB6B01A45B8750D603CD0BD4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Option Indexed to Issuer's Equity [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OptionIndexedToIssuersEquityEquityAxis" xlink:label="loc_us-gaap_OptionIndexedToIssuersEquityEquityAxis_83B88DB8BB6B01A45B8750D603CD0BD4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OptionIndexedToIssuersEquityEquityAxis_83B88DB8BB6B01A45B8750D603CD0BD4" xlink:to="lab_us-gaap_OptionIndexedToIssuersEquityEquityAxis_83B88DB8BB6B01A45B8750D603CD0BD4" xlink:type="arc" />
    <link:label id="lab_us-gaap_OptionIndexedToIssuersEquityTypeDomain_6755699BF71191D6519950D603CEE269_terseLabel_en-US" xlink:label="lab_us-gaap_OptionIndexedToIssuersEquityTypeDomain_6755699BF71191D6519950D603CEE269" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Option Indexed to Issuer's Equity, Type [Domain]</link:label>
    <link:label id="lab_us-gaap_OptionIndexedToIssuersEquityTypeDomain_6755699BF71191D6519950D603CEE269_label_en-US" xlink:label="lab_us-gaap_OptionIndexedToIssuersEquityTypeDomain_6755699BF71191D6519950D603CEE269" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Option Indexed to Issuer's Equity, Type [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OptionIndexedToIssuersEquityTypeDomain" xlink:label="loc_us-gaap_OptionIndexedToIssuersEquityTypeDomain_6755699BF71191D6519950D603CEE269" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OptionIndexedToIssuersEquityTypeDomain_6755699BF71191D6519950D603CEE269" xlink:to="lab_us-gaap_OptionIndexedToIssuersEquityTypeDomain_6755699BF71191D6519950D603CEE269" xlink:type="arc" />
    <link:label id="lab_us-gaap_CallOptionMember_B3DB15BB677F6A49398B50D603CE6237_terseLabel_en-US" xlink:label="lab_us-gaap_CallOptionMember_B3DB15BB677F6A49398B50D603CE6237" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Call Option</link:label>
    <link:label id="lab_us-gaap_CallOptionMember_B3DB15BB677F6A49398B50D603CE6237_label_en-US" xlink:label="lab_us-gaap_CallOptionMember_B3DB15BB677F6A49398B50D603CE6237" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Call Option [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CallOptionMember" xlink:label="loc_us-gaap_CallOptionMember_B3DB15BB677F6A49398B50D603CE6237" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CallOptionMember_B3DB15BB677F6A49398B50D603CE6237" xlink:to="lab_us-gaap_CallOptionMember_B3DB15BB677F6A49398B50D603CE6237" xlink:type="arc" />
    <link:label id="lab_gpor_JulyTwoThousandSixteenJuneTwoThousandSeventeenMember_C8A31BDB03A86729991750D603CE9AE3_terseLabel_en-US" xlink:label="lab_gpor_JulyTwoThousandSixteenJuneTwoThousandSeventeenMember_C8A31BDB03A86729991750D603CE9AE3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">July 2016 - June 2017</link:label>
    <link:label id="lab_gpor_JulyTwoThousandSixteenJuneTwoThousandSeventeenMember_C8A31BDB03A86729991750D603CE9AE3_label_en-US" xlink:label="lab_gpor_JulyTwoThousandSixteenJuneTwoThousandSeventeenMember_C8A31BDB03A86729991750D603CE9AE3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">July Two Thousand Sixteen - June Two Thousand Seventeen [Member]</link:label>
    <link:label id="lab_gpor_JulyTwoThousandSixteenJuneTwoThousandSeventeenMember_C8A31BDB03A86729991750D603CE9AE3_documentation_en-US" xlink:label="lab_gpor_JulyTwoThousandSixteenJuneTwoThousandSeventeenMember_C8A31BDB03A86729991750D603CE9AE3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">July Two Thousand Sixteen - June Two Thousand Seventeen [Member]</link:label>
    <link:loc xlink:href="gpor-20160630.xsd#gpor_JulyTwoThousandSixteenJuneTwoThousandSeventeenMember" xlink:label="loc_gpor_JulyTwoThousandSixteenJuneTwoThousandSeventeenMember_C8A31BDB03A86729991750D603CE9AE3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gpor_JulyTwoThousandSixteenJuneTwoThousandSeventeenMember_C8A31BDB03A86729991750D603CE9AE3" xlink:to="lab_gpor_JulyTwoThousandSixteenJuneTwoThousandSeventeenMember_C8A31BDB03A86729991750D603CE9AE3" xlink:type="arc" />
    <link:label id="lab_gpor_JulyTwoThousandSixteenMember_70F4C0C5D2D8FA83564550D603CE9646_terseLabel_en-US" xlink:label="lab_gpor_JulyTwoThousandSixteenMember_70F4C0C5D2D8FA83564550D603CE9646" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">July 2016</link:label>
    <link:label id="lab_gpor_JulyTwoThousandSixteenMember_70F4C0C5D2D8FA83564550D603CE9646_label_en-US" xlink:label="lab_gpor_JulyTwoThousandSixteenMember_70F4C0C5D2D8FA83564550D603CE9646" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">July Two Thousand Sixteen [Member]</link:label>
    <link:label id="lab_gpor_JulyTwoThousandSixteenMember_70F4C0C5D2D8FA83564550D603CE9646_documentation_en-US" xlink:label="lab_gpor_JulyTwoThousandSixteenMember_70F4C0C5D2D8FA83564550D603CE9646" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">July Two Thousand Sixteen [Member]</link:label>
    <link:loc xlink:href="gpor-20160630.xsd#gpor_JulyTwoThousandSixteenMember" xlink:label="loc_gpor_JulyTwoThousandSixteenMember_70F4C0C5D2D8FA83564550D603CE9646" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gpor_JulyTwoThousandSixteenMember_70F4C0C5D2D8FA83564550D603CE9646" xlink:to="lab_gpor_JulyTwoThousandSixteenMember_70F4C0C5D2D8FA83564550D603CE9646" xlink:type="arc" />
    <link:label id="lab_gpor_AugustTwoThousandSixteenSeptemberTwoThousandSixteenMember_B41D6326E4C522FB90D650D603CE22B0_terseLabel_en-US" xlink:label="lab_gpor_AugustTwoThousandSixteenSeptemberTwoThousandSixteenMember_B41D6326E4C522FB90D650D603CE22B0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">August 2016 - September 2016</link:label>
    <link:label id="lab_gpor_AugustTwoThousandSixteenSeptemberTwoThousandSixteenMember_B41D6326E4C522FB90D650D603CE22B0_label_en-US" xlink:label="lab_gpor_AugustTwoThousandSixteenSeptemberTwoThousandSixteenMember_B41D6326E4C522FB90D650D603CE22B0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">August Two Thousand Sixteen - September Two Thousand Sixteen [Member]</link:label>
    <link:label id="lab_gpor_AugustTwoThousandSixteenSeptemberTwoThousandSixteenMember_B41D6326E4C522FB90D650D603CE22B0_documentation_en-US" xlink:label="lab_gpor_AugustTwoThousandSixteenSeptemberTwoThousandSixteenMember_B41D6326E4C522FB90D650D603CE22B0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">August Two Thousand Sixteen - September Two Thousand Sixteen [Member]</link:label>
    <link:loc xlink:href="gpor-20160630.xsd#gpor_AugustTwoThousandSixteenSeptemberTwoThousandSixteenMember" xlink:label="loc_gpor_AugustTwoThousandSixteenSeptemberTwoThousandSixteenMember_B41D6326E4C522FB90D650D603CE22B0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gpor_AugustTwoThousandSixteenSeptemberTwoThousandSixteenMember_B41D6326E4C522FB90D650D603CE22B0" xlink:to="lab_gpor_AugustTwoThousandSixteenSeptemberTwoThousandSixteenMember_B41D6326E4C522FB90D650D603CE22B0" xlink:type="arc" />
    <link:label id="lab_gpor_OctoberTwoThousandSixteenMember_A6C1BD86E09B78C63FA250D603CE45DE_terseLabel_en-US" xlink:label="lab_gpor_OctoberTwoThousandSixteenMember_A6C1BD86E09B78C63FA250D603CE45DE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">October 2016</link:label>
    <link:label id="lab_gpor_OctoberTwoThousandSixteenMember_A6C1BD86E09B78C63FA250D603CE45DE_label_en-US" xlink:label="lab_gpor_OctoberTwoThousandSixteenMember_A6C1BD86E09B78C63FA250D603CE45DE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">October Two Thousand Sixteen [Member]</link:label>
    <link:label id="lab_gpor_OctoberTwoThousandSixteenMember_A6C1BD86E09B78C63FA250D603CE45DE_documentation_en-US" xlink:label="lab_gpor_OctoberTwoThousandSixteenMember_A6C1BD86E09B78C63FA250D603CE45DE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">October Two Thousand Sixteen [Member]</link:label>
    <link:loc xlink:href="gpor-20160630.xsd#gpor_OctoberTwoThousandSixteenMember" xlink:label="loc_gpor_OctoberTwoThousandSixteenMember_A6C1BD86E09B78C63FA250D603CE45DE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gpor_OctoberTwoThousandSixteenMember_A6C1BD86E09B78C63FA250D603CE45DE" xlink:to="lab_gpor_OctoberTwoThousandSixteenMember_A6C1BD86E09B78C63FA250D603CE45DE" xlink:type="arc" />
    <link:label id="lab_gpor_NovemberTwoThousandSixteenDecemberTwoThousandSixteenMember_3377F3DCEC1F131C957A50D603CE2DB5_terseLabel_en-US" xlink:label="lab_gpor_NovemberTwoThousandSixteenDecemberTwoThousandSixteenMember_3377F3DCEC1F131C957A50D603CE2DB5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">November 2016 - December 2016</link:label>
    <link:label id="lab_gpor_NovemberTwoThousandSixteenDecemberTwoThousandSixteenMember_3377F3DCEC1F131C957A50D603CE2DB5_label_en-US" xlink:label="lab_gpor_NovemberTwoThousandSixteenDecemberTwoThousandSixteenMember_3377F3DCEC1F131C957A50D603CE2DB5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">November Two Thousand Sixteen - December Two Thousand Sixteen [Member]</link:label>
    <link:label id="lab_gpor_NovemberTwoThousandSixteenDecemberTwoThousandSixteenMember_3377F3DCEC1F131C957A50D603CE2DB5_documentation_en-US" xlink:label="lab_gpor_NovemberTwoThousandSixteenDecemberTwoThousandSixteenMember_3377F3DCEC1F131C957A50D603CE2DB5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">November Two Thousand Sixteen - December Two Thousand Sixteen [Member]</link:label>
    <link:loc xlink:href="gpor-20160630.xsd#gpor_NovemberTwoThousandSixteenDecemberTwoThousandSixteenMember" xlink:label="loc_gpor_NovemberTwoThousandSixteenDecemberTwoThousandSixteenMember_3377F3DCEC1F131C957A50D603CE2DB5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gpor_NovemberTwoThousandSixteenDecemberTwoThousandSixteenMember_3377F3DCEC1F131C957A50D603CE2DB5" xlink:to="lab_gpor_NovemberTwoThousandSixteenDecemberTwoThousandSixteenMember_3377F3DCEC1F131C957A50D603CE2DB5" xlink:type="arc" />
    <link:label id="lab_gpor_JanuaryTwoThousandSeventeenFebruaryTwoThousandSeventeenMember_2124599F026B9EA677BD50D603CE2C31_terseLabel_en-US" xlink:label="lab_gpor_JanuaryTwoThousandSeventeenFebruaryTwoThousandSeventeenMember_2124599F026B9EA677BD50D603CE2C31" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">January 2017 - February 2017</link:label>
    <link:label id="lab_gpor_JanuaryTwoThousandSeventeenFebruaryTwoThousandSeventeenMember_2124599F026B9EA677BD50D603CE2C31_label_en-US" xlink:label="lab_gpor_JanuaryTwoThousandSeventeenFebruaryTwoThousandSeventeenMember_2124599F026B9EA677BD50D603CE2C31" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">January Two Thousand Seventeen - February Two Thousand Seventeen [Member]</link:label>
    <link:label id="lab_gpor_JanuaryTwoThousandSeventeenFebruaryTwoThousandSeventeenMember_2124599F026B9EA677BD50D603CE2C31_documentation_en-US" xlink:label="lab_gpor_JanuaryTwoThousandSeventeenFebruaryTwoThousandSeventeenMember_2124599F026B9EA677BD50D603CE2C31" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">January Two Thousand Seventeen - February Two Thousand Seventeen [Member]</link:label>
    <link:loc xlink:href="gpor-20160630.xsd#gpor_JanuaryTwoThousandSeventeenFebruaryTwoThousandSeventeenMember" xlink:label="loc_gpor_JanuaryTwoThousandSeventeenFebruaryTwoThousandSeventeenMember_2124599F026B9EA677BD50D603CE2C31" xlink:type="locator" />
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    <link:label id="lab_gpor_MarchTwoThousandSeventeenMember_75CC239D9075C417329350D603CE0E77_documentation_en-US" xlink:label="lab_gpor_MarchTwoThousandSeventeenMember_75CC239D9075C417329350D603CE0E77" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">March Two Thousand Seventeen [Member]</link:label>
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    <link:label id="lab_gpor_AprilTwoThousandSeventeenJuneTwoThousandSeventeenMember_898FC95E16BFA224569850D603CE1135_label_en-US" xlink:label="lab_gpor_AprilTwoThousandSeventeenJuneTwoThousandSeventeenMember_898FC95E16BFA224569850D603CE1135" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">April Two Thousand Seventeen - June Two Thousand Seventeen [Member]</link:label>
    <link:label id="lab_gpor_AprilTwoThousandSeventeenJuneTwoThousandSeventeenMember_898FC95E16BFA224569850D603CE1135_documentation_en-US" xlink:label="lab_gpor_AprilTwoThousandSeventeenJuneTwoThousandSeventeenMember_898FC95E16BFA224569850D603CE1135" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">April Two Thousand Seventeen - June Two Thousand Seventeen [Member]</link:label>
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    <link:label id="lab_gpor_JulyTwoThousandSeventeenOctoberTwoThousandSeventeenMember_8088DB050D10D6637CA550D603CE03A8_label_en-US" xlink:label="lab_gpor_JulyTwoThousandSeventeenOctoberTwoThousandSeventeenMember_8088DB050D10D6637CA550D603CE03A8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">July Two Thousand Seventeen - October Two Thousand Seventeen [Member]</link:label>
    <link:label id="lab_gpor_JulyTwoThousandSeventeenOctoberTwoThousandSeventeenMember_8088DB050D10D6637CA550D603CE03A8_documentation_en-US" xlink:label="lab_gpor_JulyTwoThousandSeventeenOctoberTwoThousandSeventeenMember_8088DB050D10D6637CA550D603CE03A8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">July Two Thousand Seventeen - October Two Thousand Seventeen [Member]</link:label>
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    <link:label id="lab_gpor_NovemberTwoThousandSeventeenDecemberTwoThousandSeventeenMember_7A09F4A96AD0E0AB72F250D603CE00BD_label_en-US" xlink:label="lab_gpor_NovemberTwoThousandSeventeenDecemberTwoThousandSeventeenMember_7A09F4A96AD0E0AB72F250D603CE00BD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">November Two Thousand Seventeen - December Two Thousand Seventeen [Member]</link:label>
    <link:label id="lab_gpor_NovemberTwoThousandSeventeenDecemberTwoThousandSeventeenMember_7A09F4A96AD0E0AB72F250D603CE00BD_documentation_en-US" xlink:label="lab_gpor_NovemberTwoThousandSeventeenDecemberTwoThousandSeventeenMember_7A09F4A96AD0E0AB72F250D603CE00BD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">November Two Thousand Seventeen - December Two Thousand Seventeen [Member]</link:label>
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    <link:label id="lab_gpor_JanuaryTwoThousandEighteenMarchTwoThousandEighteenMember_B4007BDE4F4B76A4684050D603CEC5C4_documentation_en-US" xlink:label="lab_gpor_JanuaryTwoThousandEighteenMarchTwoThousandEighteenMember_B4007BDE4F4B76A4684050D603CEC5C4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">January Two Thousand Eighteen - March Two Thousand Eighteen [Member]</link:label>
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    <link:label id="lab_gpor_AprilTwoThousandEighteenDecemberTwoThousandEighteenMember_857621F418D009C98BD250D603CE641F_documentation_en-US" xlink:label="lab_gpor_AprilTwoThousandEighteenDecemberTwoThousandEighteenMember_857621F418D009C98BD250D603CE641F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">April Two Thousand Eighteen - December Two Thousand Eighteen [Member]</link:label>
    <link:loc xlink:href="gpor-20160630.xsd#gpor_AprilTwoThousandEighteenDecemberTwoThousandEighteenMember" xlink:label="loc_gpor_AprilTwoThousandEighteenDecemberTwoThousandEighteenMember_857621F418D009C98BD250D603CE641F" xlink:type="locator" />
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    <link:label id="lab_gpor_JanuaryTwoThousandNineteenMarchTwoThousandNineteenMember_84D8EDDE7E7DCDE02DC850D603CE83F1_terseLabel_en-US" xlink:label="lab_gpor_JanuaryTwoThousandNineteenMarchTwoThousandNineteenMember_84D8EDDE7E7DCDE02DC850D603CE83F1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">January 2019 - March 2019</link:label>
    <link:label id="lab_gpor_JanuaryTwoThousandNineteenMarchTwoThousandNineteenMember_84D8EDDE7E7DCDE02DC850D603CE83F1_label_en-US" xlink:label="lab_gpor_JanuaryTwoThousandNineteenMarchTwoThousandNineteenMember_84D8EDDE7E7DCDE02DC850D603CE83F1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">January Two Thousand Nineteen - March Two Thousand Nineteen [Member]</link:label>
    <link:label id="lab_gpor_JanuaryTwoThousandNineteenMarchTwoThousandNineteenMember_84D8EDDE7E7DCDE02DC850D603CE83F1_documentation_en-US" xlink:label="lab_gpor_JanuaryTwoThousandNineteenMarchTwoThousandNineteenMember_84D8EDDE7E7DCDE02DC850D603CE83F1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">January Two Thousand Nineteen - March Two Thousand Nineteen [Member]</link:label>
    <link:loc xlink:href="gpor-20160630.xsd#gpor_JanuaryTwoThousandNineteenMarchTwoThousandNineteenMember" xlink:label="loc_gpor_JanuaryTwoThousandNineteenMarchTwoThousandNineteenMember_84D8EDDE7E7DCDE02DC850D603CE83F1" xlink:type="locator" />
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    <link:label id="lab_gpor_JulyTwoThousandSixteenDecemberTwoThousandSixteenMember_19469B816D72C9CEEFE050D603CEEDBF_documentation_en-US" xlink:label="lab_gpor_JulyTwoThousandSixteenDecemberTwoThousandSixteenMember_19469B816D72C9CEEFE050D603CEEDBF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">July Two Thousand Sixteen - December Two Thousand Sixteen [Member]</link:label>
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    <link:label id="lab_gpor_JanuaryTwoThousandSeventeenMarchTwoThousandSeventeenMember_1C79569176A6883A5B8D50D603CFB52C_documentation_en-US" xlink:label="lab_gpor_JanuaryTwoThousandSeventeenMarchTwoThousandSeventeenMember_1C79569176A6883A5B8D50D603CFB52C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">January Two Thousand Seventeen - March Two Thousand Seventeen [Member]</link:label>
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