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    <link:label id="lab_gpor_StingrayCementingLlcMember_DA907DCF06870AEA88CCA360AFDCA41F_terseLabel_en-US" xlink:label="lab_gpor_StingrayCementingLlcMember_DA907DCF06870AEA88CCA360AFDCA41F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investment in Stingray Cementing LLC</link:label>
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    <link:label id="lab_gpor_StingrayEnergyServicesLlcMember_BAB8810BE92043D48E0FA360AFDC8D23_label_en-US" xlink:label="lab_gpor_StingrayEnergyServicesLlcMember_BAB8810BE92043D48E0FA360AFDC8D23" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stingray Energy Services LLC [Member]</link:label>
    <link:label id="lab_gpor_StingrayEnergyServicesLlcMember_BAB8810BE92043D48E0FA360AFDC8D23_documentation_en-US" xlink:label="lab_gpor_StingrayEnergyServicesLlcMember_BAB8810BE92043D48E0FA360AFDC8D23" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Stingray Energy Services LLC [Member]</link:label>
    <link:loc xlink:href="gpor-20180930.xsd#gpor_StingrayEnergyServicesLlcMember" xlink:label="loc_gpor_StingrayEnergyServicesLlcMember_BAB8810BE92043D48E0FA360AFDC8D23" xlink:type="locator" />
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    <link:label id="lab_gpor_SturgeonAcquisitionsLLCMember_F7415C09AADBED1A72FDA360AFDC4D24_terseLabel_en-US" xlink:label="lab_gpor_SturgeonAcquisitionsLLCMember_F7415C09AADBED1A72FDA360AFDC4D24" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investment in Sturgeon Acquisitions LLC</link:label>
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    <link:label id="lab_gpor_StrikeForceMidstreamLLCMember_AA774301A71692EBDFC0A360AFDDD5D8_documentation_en-US" xlink:label="lab_gpor_StrikeForceMidstreamLLCMember_AA774301A71692EBDFC0A360AFDDD5D8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Strike Force Midstream LLC [Member]</link:label>
    <link:loc xlink:href="gpor-20180930.xsd#gpor_StrikeForceMidstreamLLCMember" xlink:label="loc_gpor_StrikeForceMidstreamLLCMember_AA774301A71692EBDFC0A360AFDDD5D8" xlink:type="locator" />
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    <link:label id="lab_gpor_TransportationCommitmentMember_A3B4A19E24CB6F0F6834C23768494122_terseLabel_en-US" xlink:label="lab_gpor_TransportationCommitmentMember_A3B4A19E24CB6F0F6834C23768494122" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Transportation commitment</link:label>
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    <link:label id="lab_gpor_TransportationCommitmentMember_A3B4A19E24CB6F0F6834C23768494122_documentation_en-US" xlink:label="lab_gpor_TransportationCommitmentMember_A3B4A19E24CB6F0F6834C23768494122" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Transportation Commitment [Member]</link:label>
    <link:loc xlink:href="gpor-20180930.xsd#gpor_TransportationCommitmentMember" xlink:label="loc_gpor_TransportationCommitmentMember_A3B4A19E24CB6F0F6834C23768494122" xlink:type="locator" />
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    <link:label id="lab_srt_LitigationCaseTypeDomain_A3736078A72741473BCBC237684C40D0_label_en-US" xlink:label="lab_srt_LitigationCaseTypeDomain_A3736078A72741473BCBC237684C40D0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Litigation Case [Domain]</link:label>
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    <link:label id="lab_gpor_JudicialDistrictCourtfortheParishofCameronMember_84DCA8C0D98DE7AA3A8AC237684CC904_terseLabel_en-US" xlink:label="lab_gpor_JudicialDistrictCourtfortheParishofCameronMember_84DCA8C0D98DE7AA3A8AC237684CC904" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Judicial District Court for the Parish of Cameron</link:label>
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    <link:label id="lab_gpor_JudicialDistrictCourtfortheParishofCameronMember_84DCA8C0D98DE7AA3A8AC237684CC904_documentation_en-US" xlink:label="lab_gpor_JudicialDistrictCourtfortheParishofCameronMember_84DCA8C0D98DE7AA3A8AC237684CC904" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Judicial District Court for the Parish of Cameron [Member]</link:label>
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    <link:label id="lab_gpor_JudicialDistrictCourtfortheParishofVermillionMember_E8783A58B14DEE9B440CC237684D3A9F_terseLabel_en-US" xlink:label="lab_gpor_JudicialDistrictCourtfortheParishofVermillionMember_E8783A58B14DEE9B440CC237684D3A9F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Judicial District Court for the Parish of Vermillion</link:label>
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    <link:label id="lab_gpor_CommitmentsLineItems_697F2C02918C0F9F73B3C237684DC87A_terseLabel_en-US" xlink:label="lab_gpor_CommitmentsLineItems_697F2C02918C0F9F73B3C237684DC87A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commitments [Line Items]</link:label>
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    <link:label id="lab_gpor_PurchasingRemainingPercentInterestInOilAndGasProperty_D199C557981084879D56C237684DF25A_terseLabel_en-US" xlink:label="lab_gpor_PurchasingRemainingPercentInterestInOilAndGasProperty_D199C557981084879D56C237684DF25A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Remaining interest in oil and gas property acquisition, percent</link:label>
    <link:label id="lab_gpor_PurchasingRemainingPercentInterestInOilAndGasProperty_D199C557981084879D56C237684DF25A_label_en-US" xlink:label="lab_gpor_PurchasingRemainingPercentInterestInOilAndGasProperty_D199C557981084879D56C237684DF25A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchasing Remaining Percent Interest In Oil And Gas Property</link:label>
    <link:label id="lab_gpor_PurchasingRemainingPercentInterestInOilAndGasProperty_D199C557981084879D56C237684DF25A_documentation_en-US" xlink:label="lab_gpor_PurchasingRemainingPercentInterestInOilAndGasProperty_D199C557981084879D56C237684DF25A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Purchasing remaining percent interest in oil and gas property.</link:label>
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    <link:label id="lab_gpor_PaymentsHeldForRestrictedCash_02449DD3D31859F6CBD6C237684E2823_terseLabel_en-US" xlink:label="lab_gpor_PaymentsHeldForRestrictedCash_02449DD3D31859F6CBD6C237684E2823" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Payments of seller's obligation to contribute</link:label>
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    <link:label id="lab_gpor_PaymentsHeldForRestrictedCash_02449DD3D31859F6CBD6C237684E2823_documentation_en-US" xlink:label="lab_gpor_PaymentsHeldForRestrictedCash_02449DD3D31859F6CBD6C237684E2823" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">payments to plugging and abandonment escrow account.</link:label>
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    <link:label id="lab_gpor_SignificantPluggingCommitmentMinimumNumberOfWellsToBePlugged_39778950F005B990855AC237684E74FA_terseLabel_en-US" xlink:label="lab_gpor_SignificantPluggingCommitmentMinimumNumberOfWellsToBePlugged_39778950F005B990855AC237684E74FA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Minimum number of wells to be plugged (in wells)</link:label>
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    <link:label id="lab_gpor_TenureOfMinimumWellsToBePlugged_D7ED4226414090D3F2AEC237684E4940_terseLabel_en-US" xlink:label="lab_gpor_TenureOfMinimumWellsToBePlugged_D7ED4226414090D3F2AEC237684E4940" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Tenure of minimum wells to be plugged (in years)</link:label>
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    <link:label id="lab_gpor_PluggingAndAbandonmentEscrowAccount_2BFB1EFA30954E73E9B7C237684F9E58_verboseLabel_en-US" xlink:label="lab_gpor_PluggingAndAbandonmentEscrowAccount_2BFB1EFA30954E73E9B7C237684F9E58" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Plugging and abandonment trust on the WCBB properties</link:label>
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    <link:label id="lab_gpor_NumberOfWellsPlugged_F8B1FE8A193C9FF62BA9C237684FFB6A_terseLabel_en-US" xlink:label="lab_gpor_NumberOfWellsPlugged_F8B1FE8A193C9FF62BA9C237684FFB6A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of wells plugged (in wells)</link:label>
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    <link:label id="lab_us-gaap_LesseeOperatingLeaseTermOfContract_AF997C7870D6DA3FF338C237684F203B_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseTermOfContract_AF997C7870D6DA3FF338C237684F203B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating lease, term (in years)</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_D047B24CBC1144DDC754CEA2C5C37199" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_D047B24CBC1144DDC754CEA2C5C37199" xlink:to="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_D047B24CBC1144DDC754CEA2C5C37199" xlink:type="arc" />
    <link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_9FA112D7DB8F1C546D31CEA2C5C3F1D1_verboseLabel_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_9FA112D7DB8F1C546D31CEA2C5C3F1D1" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Weighted average period of expense recognition period</link:label>
    <link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_9FA112D7DB8F1C546D31CEA2C5C3F1D1_label_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_9FA112D7DB8F1C546D31CEA2C5C3F1D1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_9FA112D7DB8F1C546D31CEA2C5C3F1D1" xlink:type="locator" />
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    <link:label id="lab_srt_ScheduleOfCondensedFinancialStatementsTable_DB1452D963B495F2EE19405966AB4F34_terseLabel_en-US" xlink:label="lab_srt_ScheduleOfCondensedFinancialStatementsTable_DB1452D963B495F2EE19405966AB4F34" 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_DB1452D963B495F2EE19405966AB4F34_label_en-US" xlink:label="lab_srt_ScheduleOfCondensedFinancialStatementsTable_DB1452D963B495F2EE19405966AB4F34" 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_DB1452D963B495F2EE19405966AB4F34" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentAxis_301E0214B46E68BDE66E405966AC9D3C_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentAxis_301E0214B46E68BDE66E405966AC9D3C" 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_301E0214B46E68BDE66E405966AC9D3C_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentAxis_301E0214B46E68BDE66E405966AC9D3C" 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_301E0214B46E68BDE66E405966AC9D3C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentAxis_301E0214B46E68BDE66E405966AC9D3C" xlink:to="lab_us-gaap_DebtInstrumentAxis_301E0214B46E68BDE66E405966AC9D3C" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentNameDomain_9C84D0288BE97F030CD2405966AC01E8_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentNameDomain_9C84D0288BE97F030CD2405966AC01E8" 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_9C84D0288BE97F030CD2405966AC01E8_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentNameDomain_9C84D0288BE97F030CD2405966AC01E8" 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_9C84D0288BE97F030CD2405966AC01E8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_9C84D0288BE97F030CD2405966AC01E8" xlink:to="lab_us-gaap_DebtInstrumentNameDomain_9C84D0288BE97F030CD2405966AC01E8" xlink:type="arc" />
    <link:label id="lab_gpor_A6.625SeniorNotesMember_25B26A6F8E45A6ED0C2F405966ADD48C_terseLabel_en-US" xlink:label="lab_gpor_A6.625SeniorNotesMember_25B26A6F8E45A6ED0C2F405966ADD48C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6.625% senior unsecured notes due 2023</link:label>
    <link:label id="lab_gpor_A6.625SeniorNotesMember_25B26A6F8E45A6ED0C2F405966ADD48C_label_en-US" xlink:label="lab_gpor_A6.625SeniorNotesMember_25B26A6F8E45A6ED0C2F405966ADD48C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">6.625% Senior Notes [Member]</link:label>
    <link:label id="lab_gpor_A6.625SeniorNotesMember_25B26A6F8E45A6ED0C2F405966ADD48C_documentation_en-US" xlink:label="lab_gpor_A6.625SeniorNotesMember_25B26A6F8E45A6ED0C2F405966ADD48C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">6.625% Senior Notes [Member]</link:label>
    <link:loc xlink:href="gpor-20180930.xsd#gpor_A6.625SeniorNotesMember" xlink:label="loc_gpor_A6.625SeniorNotesMember_25B26A6F8E45A6ED0C2F405966ADD48C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gpor_A6.625SeniorNotesMember_25B26A6F8E45A6ED0C2F405966ADD48C" xlink:to="lab_gpor_A6.625SeniorNotesMember_25B26A6F8E45A6ED0C2F405966ADD48C" xlink:type="arc" />
    <link:label id="lab_gpor_A6.000SeniorNotesMember_E3CF590750CF66AD82D7405966AD6122_terseLabel_en-US" xlink:label="lab_gpor_A6.000SeniorNotesMember_E3CF590750CF66AD82D7405966AD6122" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6.000% senior unsecured notes due 2024</link:label>
    <link:label id="lab_gpor_A6.000SeniorNotesMember_E3CF590750CF66AD82D7405966AD6122_label_en-US" xlink:label="lab_gpor_A6.000SeniorNotesMember_E3CF590750CF66AD82D7405966AD6122" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">6.000% Senior Notes [Member]</link:label>
    <link:label id="lab_gpor_A6.000SeniorNotesMember_E3CF590750CF66AD82D7405966AD6122_documentation_en-US" xlink:label="lab_gpor_A6.000SeniorNotesMember_E3CF590750CF66AD82D7405966AD6122" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">6.000% Senior Notes [Member]</link:label>
    <link:loc xlink:href="gpor-20180930.xsd#gpor_A6.000SeniorNotesMember" xlink:label="loc_gpor_A6.000SeniorNotesMember_E3CF590750CF66AD82D7405966AD6122" xlink:type="locator" />
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    <link:label id="lab_gpor_A6.375SeniorNotesMember_32F395FD9F1E814BEB9F405966ADA772_terseLabel_en-US" xlink:label="lab_gpor_A6.375SeniorNotesMember_32F395FD9F1E814BEB9F405966ADA772" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6.375% senior unsecured notes due 2025</link:label>
    <link:label id="lab_gpor_A6.375SeniorNotesMember_32F395FD9F1E814BEB9F405966ADA772_label_en-US" xlink:label="lab_gpor_A6.375SeniorNotesMember_32F395FD9F1E814BEB9F405966ADA772" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">6.375% Senior Notes [Member]</link:label>
    <link:label id="lab_gpor_A6.375SeniorNotesMember_32F395FD9F1E814BEB9F405966ADA772_documentation_en-US" xlink:label="lab_gpor_A6.375SeniorNotesMember_32F395FD9F1E814BEB9F405966ADA772" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">6.375% Senior Notes [Member]</link:label>
    <link:loc xlink:href="gpor-20180930.xsd#gpor_A6.375SeniorNotesMember" xlink:label="loc_gpor_A6.375SeniorNotesMember_32F395FD9F1E814BEB9F405966ADA772" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gpor_A6.375SeniorNotesMember_32F395FD9F1E814BEB9F405966ADA772" xlink:to="lab_gpor_A6.375SeniorNotesMember_32F395FD9F1E814BEB9F405966ADA772" xlink:type="arc" />
    <link:label id="lab_gpor_A6.375SeniorNotesDue2026Member_01FABA4B1F2CE3D112BF405966ADFC53_terseLabel_en-US" xlink:label="lab_gpor_A6.375SeniorNotesDue2026Member_01FABA4B1F2CE3D112BF405966ADFC53" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6.375% senior unsecured notes due 2026</link:label>
    <link:label id="lab_gpor_A6.375SeniorNotesDue2026Member_01FABA4B1F2CE3D112BF405966ADFC53_label_en-US" xlink:label="lab_gpor_A6.375SeniorNotesDue2026Member_01FABA4B1F2CE3D112BF405966ADFC53" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">6.375% Senior Notes Due 2026 [Member]</link:label>
    <link:label id="lab_gpor_A6.375SeniorNotesDue2026Member_01FABA4B1F2CE3D112BF405966ADFC53_documentation_en-US" xlink:label="lab_gpor_A6.375SeniorNotesDue2026Member_01FABA4B1F2CE3D112BF405966ADFC53" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">6.375% Senior Notes Due 2026 [Member]</link:label>
    <link:loc xlink:href="gpor-20180930.xsd#gpor_A6.375SeniorNotesDue2026Member" xlink:label="loc_gpor_A6.375SeniorNotesDue2026Member_01FABA4B1F2CE3D112BF405966ADFC53" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LongtermDebtTypeDomain_39DA3FF2724628A60D7F405966AD0D93_label_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeDomain_39DA3FF2724628A60D7F405966AD0D93" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Type [Domain]</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_3E42EF455699468C63C6403AA7B7D50D" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_3E42EF455699468C63C6403AA7B7D50D" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_DD6052CD2EDDE5A796BF403AA7B71FCF_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_DD6052CD2EDDE5A796BF403AA7B71FCF" 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_OperatingLeasesFutureMinimumPaymentsDueInFourYears_DD6052CD2EDDE5A796BF403AA7B71FCF_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_DD6052CD2EDDE5A796BF403AA7B71FCF" 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_DD6052CD2EDDE5A796BF403AA7B71FCF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_DD6052CD2EDDE5A796BF403AA7B71FCF" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_DD6052CD2EDDE5A796BF403AA7B71FCF" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_F0E70696EA7E3A027401403AA7B73C97_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_F0E70696EA7E3A027401403AA7B73C97" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_F0E70696EA7E3A027401403AA7B73C97_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_F0E70696EA7E3A027401403AA7B73C97" 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_F0E70696EA7E3A027401403AA7B73C97" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_F0E70696EA7E3A027401403AA7B73C97" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_F0E70696EA7E3A027401403AA7B73C97" xlink:type="arc" />
    <link:label id="lab_gpor_SupplyCommitmentRemainderofFiscalYear_E9A29FF735FC780B544E403AA7B7B29F_terseLabel_en-US" xlink:label="lab_gpor_SupplyCommitmentRemainderofFiscalYear_E9A29FF735FC780B544E403AA7B7B29F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Remaining 2018 (in mmbtu)</link:label>
    <link:label id="lab_gpor_SupplyCommitmentRemainderofFiscalYear_E9A29FF735FC780B544E403AA7B7B29F_label_en-US" xlink:label="lab_gpor_SupplyCommitmentRemainderofFiscalYear_E9A29FF735FC780B544E403AA7B7B29F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Supply Commitment, Remainder of Fiscal Year</link:label>
    <link:label id="lab_gpor_SupplyCommitmentRemainderofFiscalYear_E9A29FF735FC780B544E403AA7B7B29F_documentation_en-US" xlink:label="lab_gpor_SupplyCommitmentRemainderofFiscalYear_E9A29FF735FC780B544E403AA7B7B29F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Supply Commitment, Remainder of Fiscal Year</link:label>
    <link:loc xlink:href="gpor-20180930.xsd#gpor_SupplyCommitmentRemainderofFiscalYear" xlink:label="loc_gpor_SupplyCommitmentRemainderofFiscalYear_E9A29FF735FC780B544E403AA7B7B29F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gpor_SupplyCommitmentRemainderofFiscalYear_E9A29FF735FC780B544E403AA7B7B29F" xlink:to="lab_gpor_SupplyCommitmentRemainderofFiscalYear_E9A29FF735FC780B544E403AA7B7B29F" xlink:type="arc" />
    <link:label id="lab_gpor_SupplyCommitmentDueinYearTwo_DDC790547AB1230E775D403AA7B8D94A_terseLabel_en-US" xlink:label="lab_gpor_SupplyCommitmentDueinYearTwo_DDC790547AB1230E775D403AA7B8D94A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019 (in mmbtu)</link:label>
    <link:label id="lab_gpor_SupplyCommitmentDueinYearTwo_DDC790547AB1230E775D403AA7B8D94A_label_en-US" xlink:label="lab_gpor_SupplyCommitmentDueinYearTwo_DDC790547AB1230E775D403AA7B8D94A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Supply Commitment, Due in Year Two</link:label>
    <link:label id="lab_gpor_SupplyCommitmentDueinYearTwo_DDC790547AB1230E775D403AA7B8D94A_documentation_en-US" xlink:label="lab_gpor_SupplyCommitmentDueinYearTwo_DDC790547AB1230E775D403AA7B8D94A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Supply Commitment, Due in Year Two</link:label>
    <link:loc xlink:href="gpor-20180930.xsd#gpor_SupplyCommitmentDueinYearTwo" xlink:label="loc_gpor_SupplyCommitmentDueinYearTwo_DDC790547AB1230E775D403AA7B8D94A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gpor_SupplyCommitmentDueinYearTwo_DDC790547AB1230E775D403AA7B8D94A" xlink:to="lab_gpor_SupplyCommitmentDueinYearTwo_DDC790547AB1230E775D403AA7B8D94A" xlink:type="arc" />
    <link:label id="lab_gpor_SupplyCommitmentDueinYearThree_B24C758BD25242EE3316403AA7B88610_terseLabel_en-US" xlink:label="lab_gpor_SupplyCommitmentDueinYearThree_B24C758BD25242EE3316403AA7B88610" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020 (in mmbtu)</link:label>
    <link:label id="lab_gpor_SupplyCommitmentDueinYearThree_B24C758BD25242EE3316403AA7B88610_label_en-US" xlink:label="lab_gpor_SupplyCommitmentDueinYearThree_B24C758BD25242EE3316403AA7B88610" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Supply Commitment, Due in Year Three</link:label>
    <link:label id="lab_gpor_SupplyCommitmentDueinYearThree_B24C758BD25242EE3316403AA7B88610_documentation_en-US" xlink:label="lab_gpor_SupplyCommitmentDueinYearThree_B24C758BD25242EE3316403AA7B88610" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Supply Commitment, Due in Year Three</link:label>
    <link:loc xlink:href="gpor-20180930.xsd#gpor_SupplyCommitmentDueinYearThree" xlink:label="loc_gpor_SupplyCommitmentDueinYearThree_B24C758BD25242EE3316403AA7B88610" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gpor_SupplyCommitmentDueinYearThree_B24C758BD25242EE3316403AA7B88610" xlink:to="lab_gpor_SupplyCommitmentDueinYearThree_B24C758BD25242EE3316403AA7B88610" xlink:type="arc" />
    <link:label id="lab_gpor_SupplyCommitmentDueinYearFour_A7E5C15F92201D1E5A9B403AA7B98D4C_terseLabel_en-US" xlink:label="lab_gpor_SupplyCommitmentDueinYearFour_A7E5C15F92201D1E5A9B403AA7B98D4C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021 (in mmbtu)</link:label>
    <link:label id="lab_gpor_SupplyCommitmentDueinYearFour_A7E5C15F92201D1E5A9B403AA7B98D4C_label_en-US" xlink:label="lab_gpor_SupplyCommitmentDueinYearFour_A7E5C15F92201D1E5A9B403AA7B98D4C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Supply Commitment, Due in Year Four</link:label>
    <link:label id="lab_gpor_SupplyCommitmentDueinYearFour_A7E5C15F92201D1E5A9B403AA7B98D4C_documentation_en-US" xlink:label="lab_gpor_SupplyCommitmentDueinYearFour_A7E5C15F92201D1E5A9B403AA7B98D4C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Supply Commitment, Due in Year Four</link:label>
    <link:loc xlink:href="gpor-20180930.xsd#gpor_SupplyCommitmentDueinYearFour" xlink:label="loc_gpor_SupplyCommitmentDueinYearFour_A7E5C15F92201D1E5A9B403AA7B98D4C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gpor_SupplyCommitmentDueinYearFour_A7E5C15F92201D1E5A9B403AA7B98D4C" xlink:to="lab_gpor_SupplyCommitmentDueinYearFour_A7E5C15F92201D1E5A9B403AA7B98D4C" xlink:type="arc" />
    <link:label id="lab_gpor_SupplyCommitmentDueinYearFive_31BA6BEF54B4FD86FCB0403AA7B97329_terseLabel_en-US" xlink:label="lab_gpor_SupplyCommitmentDueinYearFive_31BA6BEF54B4FD86FCB0403AA7B97329" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2022 (in mmbtu)</link:label>
    <link:label id="lab_gpor_SupplyCommitmentDueinYearFive_31BA6BEF54B4FD86FCB0403AA7B97329_label_en-US" xlink:label="lab_gpor_SupplyCommitmentDueinYearFive_31BA6BEF54B4FD86FCB0403AA7B97329" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Supply Commitment, Due in Year Five</link:label>
    <link:label id="lab_gpor_SupplyCommitmentDueinYearFive_31BA6BEF54B4FD86FCB0403AA7B97329_documentation_en-US" xlink:label="lab_gpor_SupplyCommitmentDueinYearFive_31BA6BEF54B4FD86FCB0403AA7B97329" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Supply Commitment, Due in Year Five</link:label>
    <link:loc xlink:href="gpor-20180930.xsd#gpor_SupplyCommitmentDueinYearFive" xlink:label="loc_gpor_SupplyCommitmentDueinYearFive_31BA6BEF54B4FD86FCB0403AA7B97329" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gpor_SupplyCommitmentDueinYearFive_31BA6BEF54B4FD86FCB0403AA7B97329" xlink:to="lab_gpor_SupplyCommitmentDueinYearFive_31BA6BEF54B4FD86FCB0403AA7B97329" xlink:type="arc" />
    <link:label id="lab_gpor_SupplyCommitmentDueAfterFifthYear_6AFC06DCD9BA42066AF3403AA7BAAC52_terseLabel_en-US" xlink:label="lab_gpor_SupplyCommitmentDueAfterFifthYear_6AFC06DCD9BA42066AF3403AA7BAAC52" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Thereafter (in mmbtu)</link:label>
    <link:label id="lab_gpor_SupplyCommitmentDueAfterFifthYear_6AFC06DCD9BA42066AF3403AA7BAAC52_label_en-US" xlink:label="lab_gpor_SupplyCommitmentDueAfterFifthYear_6AFC06DCD9BA42066AF3403AA7BAAC52" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Supply Commitment, Due After Fifth Year</link:label>
    <link:label id="lab_gpor_SupplyCommitmentDueAfterFifthYear_6AFC06DCD9BA42066AF3403AA7BAAC52_documentation_en-US" xlink:label="lab_gpor_SupplyCommitmentDueAfterFifthYear_6AFC06DCD9BA42066AF3403AA7BAAC52" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Supply Commitment, Due After Fifth Year</link:label>
    <link:loc xlink:href="gpor-20180930.xsd#gpor_SupplyCommitmentDueAfterFifthYear" xlink:label="loc_gpor_SupplyCommitmentDueAfterFifthYear_6AFC06DCD9BA42066AF3403AA7BAAC52" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gpor_SupplyCommitmentDueAfterFifthYear_6AFC06DCD9BA42066AF3403AA7BAAC52" xlink:to="lab_gpor_SupplyCommitmentDueAfterFifthYear_6AFC06DCD9BA42066AF3403AA7BAAC52" xlink:type="arc" />
    <link:label id="lab_gpor_SupplyCommitmentTotal_E92597007B3CBAD94B06403AA7BA0C88_totalLabel_en-US" xlink:label="lab_gpor_SupplyCommitmentTotal_E92597007B3CBAD94B06403AA7BA0C88" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total (in mmbtu)</link:label>
    <link:label id="lab_gpor_SupplyCommitmentTotal_E92597007B3CBAD94B06403AA7BA0C88_label_en-US" xlink:label="lab_gpor_SupplyCommitmentTotal_E92597007B3CBAD94B06403AA7BA0C88" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Supply Commitment, Total</link:label>
    <link:label id="lab_gpor_SupplyCommitmentTotal_E92597007B3CBAD94B06403AA7BA0C88_documentation_en-US" xlink:label="lab_gpor_SupplyCommitmentTotal_E92597007B3CBAD94B06403AA7BA0C88" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Supply Commitment, Total</link:label>
    <link:loc xlink:href="gpor-20180930.xsd#gpor_SupplyCommitmentTotal" xlink:label="loc_gpor_SupplyCommitmentTotal_E92597007B3CBAD94B06403AA7BA0C88" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gpor_SupplyCommitmentTotal_E92597007B3CBAD94B06403AA7BA0C88" xlink:to="lab_gpor_SupplyCommitmentTotal_E92597007B3CBAD94B06403AA7BA0C88" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherCommitmentsFutureMinimumPaymentsRemainderOfFiscalYear_0854B984A4582E01564C403AA7BAC0DD_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCommitmentsFutureMinimumPaymentsRemainderOfFiscalYear_0854B984A4582E01564C403AA7BAC0DD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Remaining 2018</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherCommitmentsFutureMinimumPaymentsRemainderOfFiscalYear" xlink:label="loc_us-gaap_OtherCommitmentsFutureMinimumPaymentsRemainderOfFiscalYear_0854B984A4582E01564C403AA7BAC0DD" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OtherCommitmentDueInSecondYear_B5793D183E91D058A512403AA7BB3738_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCommitmentDueInSecondYear_B5793D183E91D058A512403AA7BB3738" 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_OtherCommitmentDueInSecondYear_B5793D183E91D058A512403AA7BB3738_label_en-US" xlink:label="lab_us-gaap_OtherCommitmentDueInSecondYear_B5793D183E91D058A512403AA7BB3738" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Commitment, Due in Second Year</link:label>
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    <link:label id="lab_us-gaap_OtherCommitmentDueInThirdYear_F26BD6D9B67CE934DB29403AA7BBDF92_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCommitmentDueInThirdYear_F26BD6D9B67CE934DB29403AA7BBDF92" 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_OtherCommitmentDueInThirdYear_F26BD6D9B67CE934DB29403AA7BBDF92_label_en-US" xlink:label="lab_us-gaap_OtherCommitmentDueInThirdYear_F26BD6D9B67CE934DB29403AA7BBDF92" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Commitment, Due in Third Year</link:label>
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    <link:label id="lab_us-gaap_OtherCommitmentDueInFourthYear_098D682E599A1BD18427403AA7BB845E_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCommitmentDueInFourthYear_098D682E599A1BD18427403AA7BB845E" 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_OtherCommitmentDueInFourthYear_098D682E599A1BD18427403AA7BB845E_label_en-US" xlink:label="lab_us-gaap_OtherCommitmentDueInFourthYear_098D682E599A1BD18427403AA7BB845E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Commitment, Due in Fourth Year</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts" xlink:label="loc_us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts_2EEE901EBD0EDCBB6D1089454A51B1C4" xlink:type="locator" />
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    <link:label id="lab_gpor_DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations_F6C6E09724D77F6263B189454A52EDB9_documentation_en-US" xlink:label="lab_gpor_DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations_F6C6E09724D77F6263B189454A52EDB9" 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_EquityMethodInvestmentRealizedGainLossOnDisposal_087E63BF56D84EB5FA3D89454A52E6E9_label_en-US" xlink:label="lab_us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal_087E63BF56D84EB5FA3D89454A52E6E9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Method Investment, Realized Gain (Loss) on Disposal</link:label>
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    <link:label id="lab_us-gaap_EquityMethodInvestmentDividendsOrDistributions_326F05E2A17DF55F227B89454A535D05_label_en-US" xlink:label="lab_us-gaap_EquityMethodInvestmentDividendsOrDistributions_326F05E2A17DF55F227B89454A535D05" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Equity Method Investment, Distribution</link:label>
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    <link:label id="lab_gpor_IncreaseDecreaseinAccountsReceivableOilandNaturalGas_A109E9AAE122B65CACBF89454A549CD5_documentation_en-US" xlink:label="lab_gpor_IncreaseDecreaseinAccountsReceivableOilandNaturalGas_A109E9AAE122B65CACBF89454A549CD5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Accounts Receivable, Oil and Natural Gas</link:label>
    <link:loc xlink:href="gpor-20180930.xsd#gpor_IncreaseDecreaseinAccountsReceivableOilandNaturalGas" xlink:label="loc_gpor_IncreaseDecreaseinAccountsReceivableOilandNaturalGas_A109E9AAE122B65CACBF89454A549CD5" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_9DF23788956DDAA7533A89454A55527D_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_9DF23788956DDAA7533A89454A55527D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase in accounts payable, accrued liabilities and other</link:label>
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    <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_9DF23788956DDAA7533A89454A55527D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_03F160A4ECFBE455F7B989454A5639B8_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_03F160A4ECFBE455F7B989454A5639B8" 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_PaymentsToAcquireOtherPropertyPlantAndEquipment_24589251171E9E02709289454A56CB84_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment_24589251171E9E02709289454A56CB84" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Other 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_PaymentsToAcquireOtherPropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment_24589251171E9E02709289454A56CB84" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsToAcquireOilAndGasProperty_F462506C52B085B484B089454A57FAEF_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireOilAndGasProperty_F462506C52B085B484B089454A57FAEF" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Additions to oil and natural gas properties</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsToAcquireOilAndGasProperty" xlink:label="loc_us-gaap_PaymentsToAcquireOilAndGasProperty_F462506C52B085B484B089454A57FAEF" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment_DA81476901738706BCDE89454A57AC0C_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment_DA81476901738706BCDE89454A57AC0C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from sale of oil and natural gas properties</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment" xlink:label="loc_us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment_DA81476901738706BCDE89454A57AC0C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromSaleOfOtherPropertyPlantAndEquipment_56402454CF4FD74CFEB589454A5851D9_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfOtherPropertyPlantAndEquipment_56402454CF4FD74CFEB589454A5851D9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from sale of other property and equipment</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProceedsFromSaleOfOtherPropertyPlantAndEquipment" xlink:label="loc_us-gaap_ProceedsFromSaleOfOtherPropertyPlantAndEquipment_56402454CF4FD74CFEB589454A5851D9" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromSaleOfEquityMethodInvestments_83634891BC65F8BDB77889454A59A7CE_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfEquityMethodInvestments_83634891BC65F8BDB77889454A59A7CE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from sale of equity method investments</link:label>
    <link:label id="lab_us-gaap_ProceedsFromSaleOfEquityMethodInvestments_83634891BC65F8BDB77889454A59A7CE_label_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfEquityMethodInvestments_83634891BC65F8BDB77889454A59A7CE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Sale of Equity Method Investments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProceedsFromSaleOfEquityMethodInvestments" xlink:label="loc_us-gaap_ProceedsFromSaleOfEquityMethodInvestments_83634891BC65F8BDB77889454A59A7CE" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsToAcquireEquityMethodInvestments_C3A3324342A58F255DBA89454A5B7BE5_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireEquityMethodInvestments_C3A3324342A58F255DBA89454A5B7BE5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Equity Method Investments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsToAcquireEquityMethodInvestments" xlink:label="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_C3A3324342A58F255DBA89454A5B7BE5" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_8D30BEACAD64EB2A03E889454A5EB7E3_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_8D30BEACAD64EB2A03E889454A5EB7E3" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash used in investing activities</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_B3F012796339B88EB7D689454A5E4EAF_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_B3F012796339B88EB7D689454A5E4EAF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from financing activities:</link:label>
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    <link:label id="lab_us-gaap_RepaymentsOfDebt_C19A47BB697F88ECD13389454A5FAF09_negatedLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfDebt_C19A47BB697F88ECD13389454A5FAF09" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Principal payments on borrowings</link:label>
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    <link:label id="lab_us-gaap_LongTermPurchaseCommitmentTextBlock_FEE5100E8B415604760DCEA2C5A5B33E_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermPurchaseCommitmentTextBlock_FEE5100E8B415604760DCEA2C5A5B33E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of firm transportation commitments</link:label>
    <link:label id="lab_us-gaap_LongTermPurchaseCommitmentTextBlock_FEE5100E8B415604760DCEA2C5A5B33E_label_en-US" xlink:label="lab_us-gaap_LongTermPurchaseCommitmentTextBlock_FEE5100E8B415604760DCEA2C5A5B33E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Purchase Commitment [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_LongTermPurchaseCommitmentTextBlock" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentTextBlock_FEE5100E8B415604760DCEA2C5A5B33E" xlink:type="locator" />
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    <link:label id="lab_gpor_TimberWolfTerminalsLlcMember_BC87F6E820FA0D56CFC5D0B873E59466_verboseLabel_en-US" xlink:label="lab_gpor_TimberWolfTerminalsLlcMember_BC87F6E820FA0D56CFC5D0B873E59466" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Timber Wolf Terminals LLC</link:label>
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    <link:label id="lab_gpor_WindsorMidstreamLlcMember_E7D82F44CE806FC0A0F7D0B873E51C31_verboseLabel_en-US" xlink:label="lab_gpor_WindsorMidstreamLlcMember_E7D82F44CE806FC0A0F7D0B873E51C31" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Windsor Midstream LLC</link:label>
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    <link:label id="lab_gpor_RiceMidstreamHoldingsMember_80995AE685D50FA31F50D0B873E81B0A_terseLabel_en-US" xlink:label="lab_gpor_RiceMidstreamHoldingsMember_80995AE685D50FA31F50D0B873E81B0A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Rice Energy Inc</link:label>
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    <link:label id="lab_gpor_CostMethodInvestmentOwnershipPercentage_CDA378B857FB0A504BEED0B873E8501E_terseLabel_en-US" xlink:label="lab_gpor_CostMethodInvestmentOwnershipPercentage_CDA378B857FB0A504BEED0B873E8501E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Ownership percentage</link:label>
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    <link:loc xlink:href="gpor-20180930.xsd#gpor_CostMethodInvestmentOwnershipPercentage" xlink:label="loc_gpor_CostMethodInvestmentOwnershipPercentage_CDA378B857FB0A504BEED0B873E8501E" xlink:type="locator" />
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    <link:label id="lab_gpor_GasAndOilAreaReserve_010AA4BF46E45204A8C6D0B873E8E749_terseLabel_en-US" xlink:label="lab_gpor_GasAndOilAreaReserve_010AA4BF46E45204A8C6D0B873E8E749" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gas and oil area, reserve (in acres)</link:label>
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    <link:loc xlink:href="gpor-20180930.xsd#gpor_GasAndOilAreaReserve" xlink:label="loc_gpor_GasAndOilAreaReserve_010AA4BF46E45204A8C6D0B873E8E749" xlink:type="locator" />
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