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  <xs:element id="gte_SevenPointSevenFivePercentSeniorNotesDue2027Member" abstract="true" name="SevenPointSevenFivePercentSeniorNotesDue2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_NinePointFiveZeroPercentSeniorNotesDue2029Member" abstract="true" name="NinePointFiveZeroPercentSeniorNotesDue2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_NinePointSevenFivePercentSeniorNotesDue2031Member" abstract="true" name="NinePointSevenFivePercentSeniorNotesDue2031Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_CreditFacilityCanadaMember" abstract="true" name="CreditFacilityCanadaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_CreditFacilityCanadaAndColombiaMember" abstract="true" name="CreditFacilityCanadaAndColombiaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_DeferredDebtIssuanceCost" abstract="false" name="DeferredDebtIssuanceCost" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gte_NinePointSevenFivePercentSeniorNotesMember" abstract="true" name="NinePointSevenFivePercentSeniorNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_SeniorNotesRollForward" abstract="true" name="SeniorNotesRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="gte_SeniorNotesPrincipalExchanged" abstract="false" name="SeniorNotesPrincipalExchanged" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gte_SeniorNotesEarlyParticipationPremiumsAndDiscountForPrincipalExchanged" abstract="false" name="SeniorNotesEarlyParticipationPremiumsAndDiscountForPrincipalExchanged" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gte_SeniorNotesRoundingAdjustmentOnExchange" abstract="false" name="SeniorNotesRoundingAdjustmentOnExchange" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gte_SeniorNotesPurchasedInOpenMarket" abstract="false" name="SeniorNotesPurchasedInOpenMarket" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gte_ToBeRepaidOnOctober152029Member" abstract="true" name="ToBeRepaidOnOctober152029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_ToBeRepaidOnOctober152030Member" abstract="true" name="ToBeRepaidOnOctober152030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_RepaymentsOfLongTermDebtCashConsideration" abstract="false" name="RepaymentsOfLongTermDebtCashConsideration" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gte_DebtInstrumentNumberOfInstallments" abstract="false" name="DebtInstrumentNumberOfInstallments" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="gte_DebtInstrumentPercentOfPrincipalAmountToBePaid" abstract="false" name="DebtInstrumentPercentOfPrincipalAmountToBePaid" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gte_LongTermDebtMandatoryRedemptionAmount" abstract="false" name="LongTermDebtMandatoryRedemptionAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gte_DebtInstrumentCovenantConsolidatedInterestCoverageRatioMaximum" abstract="false" name="DebtInstrumentCovenantConsolidatedInterestCoverageRatioMaximum" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="gte_DebtInstrumentCovenantNetDebtToEBITDARatioMaximum" abstract="false" name="DebtInstrumentCovenantNetDebtToEBITDARatioMaximum" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="gte_DebtInstrumentRepurchaseAmountCashConsideration" abstract="false" name="DebtInstrumentRepurchaseAmountCashConsideration" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gte_SyndicatedFacilityMember" abstract="true" name="SyndicatedFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_OperatingFacilityMember" abstract="true" name="OperatingFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_CORRAMember" abstract="true" name="CORRAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_PrepaymentAgreementMember" abstract="true" name="PrepaymentAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_LineOfCreditFacilityAdditionalBorrowingCapacity" abstract="false" name="LineOfCreditFacilityAdditionalBorrowingCapacity" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gte_LineOfCreditFacilitySaleAndDeliveryOfAssetsTerm" abstract="false" name="LineOfCreditFacilitySaleAndDeliveryOfAssetsTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="gte_DebtInstrumentCovenantAssetServiceCoverageRatio" abstract="false" name="DebtInstrumentCovenantAssetServiceCoverageRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gte_LineOfCreditFacilityDiscountRate" abstract="false" name="LineOfCreditFacilityDiscountRate" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gte_LineOfCreditFacilityNetPresentValueOfFutureCashFlowsLiquidationPercentage" abstract="false" name="LineOfCreditFacilityNetPresentValueOfFutureCashFlowsLiquidationPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gte_DebtInstrumentCovenantDebtServiceCoverageRatio" abstract="false" name="DebtInstrumentCovenantDebtServiceCoverageRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gte_LineOfCreditFacilityEstimatedDeliveryPercentage" abstract="false" name="LineOfCreditFacilityEstimatedDeliveryPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gte_LongTermLineOfCreditPrepaymentArrangementRollForward" abstract="true" name="LongTermLineOfCreditPrepaymentArrangementRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="gte_A2025ProgramMember" abstract="true" name="A2025ProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_A2024ProgramMember" abstract="true" name="A2024ProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_PerformanceShareUnitsMember" abstract="true" name="PerformanceShareUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_VestedOnDecember312025Member" abstract="true" name="VestedOnDecember312025Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_VestedOnDecember312024Member" abstract="true" name="VestedOnDecember312024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_A2007EquityIncentivePlanMember" abstract="true" name="A2007EquityIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_StockPurchasedDuringPeriodAsPercentOfSharesIssuedAndOutstanding" abstract="false" name="StockPurchasedDuringPeriodAsPercentOfSharesIssuedAndOutstanding" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gte_StockRepurchasedDuringPeriodWeightedAveragePriceperShares" abstract="false" name="StockRepurchasedDuringPeriodWeightedAveragePriceperShares" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="gte_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsPaymentsforUnitsVestedinPeriod" abstract="false" name="SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsPaymentsforUnitsVestedinPeriod" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gte_DeferredShareUnitsMember" abstract="true" name="DeferredShareUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_Customer1Member" abstract="true" name="Customer1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_SurorienteBlockMember" abstract="true" name="SurorienteBlockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_DebtInstrumentCollateralPromissoryNotesProvidedAsCollateralForLettersOfCredit" abstract="false" name="DebtInstrumentCollateralPromissoryNotesProvidedAsCollateralForLettersOfCredit" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gte_DebtInstrumentCollateralLettersOfCreditAndOtherCreditSupportProvidedAsSecurity" abstract="false" name="DebtInstrumentCollateralLettersOfCreditAndOtherCreditSupportProvidedAsSecurity" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gte_RestrictedCashAndCashEquivalentsFairValueDisclosure" abstract="false" name="RestrictedCashAndCashEquivalentsFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gte_WTICMACollarSeptember2026Member" abstract="true" name="WTICMACollarSeptember2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_BrentPutOptionSeptember2026Member" abstract="true" name="BrentPutOptionSeptember2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_BrentPutSpreadSeptember2026Member" abstract="true" name="BrentPutSpreadSeptember2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_WTICMA3WaySeptember2026Member" abstract="true" name="WTICMA3WaySeptember2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_BrentThreeWaySeptember2026Member" abstract="true" name="BrentThreeWaySeptember2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_WTICMACollarDecember2026Member" abstract="true" name="WTICMACollarDecember2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_BrentPutOptionDecember2026Member" abstract="true" name="BrentPutOptionDecember2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_WTICMAThreeWayDecember2026Member" abstract="true" name="WTICMAThreeWayDecember2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_BrentPutSpreadDecember2026Member" abstract="true" name="BrentPutSpreadDecember2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_BrentThreeWayDecember2026Member" abstract="true" name="BrentThreeWayDecember2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_BrentThreeWayMarch2027Member" abstract="true" name="BrentThreeWayMarch2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_DerivativeSoldPutPrice" abstract="false" name="DerivativeSoldPutPrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="srt-types:perUnitItemType"/>
  <xs:element id="gte_DerivativePurchasedPutPrice" abstract="false" name="DerivativePurchasedPutPrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="srt-types:perUnitItemType"/>
  <xs:element id="gte_DerivativeSoldCallPrice" abstract="false" name="DerivativeSoldCallPrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="srt-types:perUnitItemType"/>
  <xs:element id="gte_DerivativePremiumPrice" abstract="false" name="DerivativePremiumPrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="srt-types:perUnitItemType"/>
  <xs:element id="gte_AECO5ASwapSeptember2026Member" abstract="true" name="AECO5ASwapSeptember2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_AECO5ASwapDecember2026Member" abstract="true" name="AECO5ASwapDecember2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_COPCollarsMarch2027Member" abstract="true" name="COPCollarsMarch2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_COPCollarsMay2027Member" abstract="true" name="COPCollarsMay2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gte_IncreaseDecreaseInPrepaidExpensesAndInventory" abstract="false" name="IncreaseDecreaseInPrepaidExpensesAndInventory" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gte_IncreaseDecreaseInOilPrepaymentProceeds" abstract="false" name="IncreaseDecreaseInOilPrepaymentProceeds" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gte_IncreaseDecreaseInAccountsPayableAndAccruedAndOtherLongTermLiabilities" abstract="false" name="IncreaseDecreaseInAccountsPayableAndAccruedAndOtherLongTermLiabilities" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gte_IncreaseDecreaseInPrepaidTaxesAndIncomeTaxesPayableNetOfIncomeTaxesReceivable" abstract="false" name="IncreaseDecreaseInPrepaidTaxesAndIncomeTaxesPayableNetOfIncomeTaxesReceivable" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gte_IncreaseDecreaseInPaymentsToAcquireOilAndGasPropertyAndEquipment" abstract="false" name="IncreaseDecreaseInPaymentsToAcquireOilAndGasPropertyAndEquipment" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gte_LiabilitiesRelatedtoPropertyPlantandEquipmentNet" abstract="false" name="LiabilitiesRelatedtoPropertyPlantandEquipmentNet" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gte_OilSalesMember" abstract="true" name="OilSalesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
