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  <xs:element id="sm_MultiplierAppliedToPsuAwardsAtSettlement" abstract="false" name="MultiplierAppliedToPsuAwardsAtSettlement" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:decimalItemType"/>
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  <xs:element id="sm_NGLSwapsContractYear3Member" abstract="true" name="NGLSwapsContractYear3Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_NGLCollarContractYear3Member" abstract="true" name="NGLCollarContractYear3Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="sm_NGLCollarContractYear2Member" abstract="true" name="NGLCollarContractYear2Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_GasCollarContractFirstQuarterYear3Member" abstract="true" name="GasCollarContractFirstQuarterYear3Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="sm_NYMEXOilSwapContractFourthQuarterYear1Member" abstract="true" name="NYMEXOilSwapContractFourthQuarterYear1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_A6625SeniorUnsecuredNotesDue2027Member" abstract="true" name="A6625SeniorUnsecuredNotesDue2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_NYMEXOilSwapContractYear3Member" abstract="true" name="NYMEXOilSwapContractYear3Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_SeniorSecuredNotesMember" abstract="true" name="SeniorSecuredNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_A5625SeniorUnsecuredNotesDue2025Member" abstract="true" name="A5625SeniorUnsecuredNotesDue2025Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_SouthTexasMember" abstract="true" name="SouthTexasMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_NYMEXOilCollarContractFourthQuarterYear1Member" abstract="true" name="NYMEXOilCollarContractFourthQuarterYear1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_A6125SeniorUnsecuredNotesDue2022And50SeniorUnsecuredNotesDue2024Member" abstract="true" name="A6125SeniorUnsecuredNotesDue2022And50SeniorUnsecuredNotesDue2024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_OperatingLeaseMember" abstract="true" name="OperatingLeaseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_WarrantsPercentOfOutstandingStock" abstract="false" name="WarrantsPercentOfOutstandingStock" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sm_ScheduleOfPotentialEffectsOfMasterNettingArrangementsTableTextBlock" abstract="false" name="ScheduleOfPotentialEffectsOfMasterNettingArrangementsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="sm_WTIMidlandNYMEXWTIMember" abstract="true" name="WTIMidlandNYMEXWTIMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_StockIssuedDuringPeriodSharesRestrictedStockUnitsAndPerformanceShareUnits" abstract="false" name="StockIssuedDuringPeriodSharesRestrictedStockUnitsAndPerformanceShareUnits" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="sm_ScheduleOfLongTermDebtInstrumentsSecuredTableTextBlock" abstract="false" name="ScheduleOfLongTermDebtInstrumentsSecuredTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="sm_GDWAHAMember" abstract="true" name="GDWAHAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_OilContractsMember" abstract="true" name="OilContractsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_NoncashFinancingActivitiesText" abstract="false" name="NoncashFinancingActivitiesText" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sm_GasCollarContractYear3Member" abstract="true" name="GasCollarContractYear3Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_OilBasisSwapContractFourthQuarterYear1Member" abstract="true" name="OilBasisSwapContractFourthQuarterYear1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_WarrantTriggeringDateAmount" abstract="false" name="WarrantTriggeringDateAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sm_CashPortionOfGainLossOnDerivativeInstrument" abstract="false" name="CashPortionOfGainLossOnDerivativeInstrument" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sm_RevenueReceiptDaysAfterSale" abstract="false" name="RevenueReceiptDaysAfterSale" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="sm_AccountsReceivablefromCustomersAbstract" abstract="true" name="AccountsReceivablefromCustomersAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="sm_GasCollarContractYear2Member" abstract="true" name="GasCollarContractYear2Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_OilRevenueMember" abstract="true" name="OilRevenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_NYMEXOilSwapContractYear2Member" abstract="true" name="NYMEXOilSwapContractYear2Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_DrillingRigLeasingContractsMember" abstract="true" name="DrillingRigLeasingContractsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_WAHAMember" abstract="true" name="WAHAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_EarlyTerminationPenaltyforRigContractCancellation" abstract="false" name="EarlyTerminationPenaltyforRigContractCancellation" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sm_NYMEXOilCollarContractThirdQuarterYear2Member" abstract="true" name="NYMEXOilCollarContractThirdQuarterYear2Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_OilBasisSwapContractYear3Member" abstract="true" name="OilBasisSwapContractYear3Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_ImpairmentofUnprovedOilandGasProperties" abstract="false" name="ImpairmentofUnprovedOilandGasProperties" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sm_PotentialPenaltyfornotMeetingMinimumDrillingandCompletionRequirements" abstract="false" name="PotentialPenaltyfornotMeetingMinimumDrillingandCompletionRequirements" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sm_NGLSwapsContractFourthQuarterYear1Member" abstract="true" name="NGLSwapsContractFourthQuarterYear1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_NYMEXWTIICEBrentMember" abstract="true" name="NYMEXWTIICEBrentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_GasBasisSwapContractYear3Member" abstract="true" name="GasBasisSwapContractYear3Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_ImpairmentofProvedOilandGasProperties" abstract="false" name="ImpairmentofProvedOilandGasProperties" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sm_LongTermDebtFairValueTableTextBlock" abstract="false" name="LongTermDebtFairValueTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="sm_NaturalGasRevenueMember" abstract="true" name="NaturalGasRevenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_GasBasisSwapContractYear2Member" abstract="true" name="GasBasisSwapContractYear2Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_ImpairmentsOfOilAndGasPropertiesTableTextBlock" abstract="false" name="ImpairmentsOfOilAndGasPropertiesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
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  <xs:element id="sm_DerivativeCalendarMonthAverageRollDifferentialSwapTypeWeightedAverageContractPrice" abstract="false" name="DerivativeCalendarMonthAverageRollDifferentialSwapTypeWeightedAverageContractPrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="srt-types:perUnitItemType"/>
  <xs:element id="sm_SupplementalCashFlowInformationInvestingActivitiesAbstract" abstract="true" name="SupplementalCashFlowInformationInvestingActivitiesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="sm_NGLContractsMember" abstract="true" name="NGLContractsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_IFTennTXZ0Member" abstract="true" name="IFTennTXZ0Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_NYMEXOilCalendarMonthAverageRollDifferentialContractYear2Member" abstract="true" name="NYMEXOilCalendarMonthAverageRollDifferentialContractYear2Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_GasSwapsContractYear2Member" abstract="true" name="GasSwapsContractYear2Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_A6125SeniorUnsecuredNotesDue2022Member" abstract="true" name="A6125SeniorUnsecuredNotesDue2022Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_OPISPropaneMontBelvieuNonTETMember" abstract="true" name="OPISPropaneMontBelvieuNonTETMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_WellsInProgress" abstract="false" name="WellsInProgress" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sm_DebtInstrumentRepurchasePremium" abstract="false" name="DebtInstrumentRepurchasePremium" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sm_AcceleratedUnamortizedDebtDiscountMember" abstract="true" name="AcceleratedUnamortizedDebtDiscountMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_SeniorUnsecuredNotesMember" abstract="true" name="SeniorUnsecuredNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_DerivativeOilBasisSwapTypeWeightedAverageContractPrice" abstract="false" name="DerivativeOilBasisSwapTypeWeightedAverageContractPrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="srt-types:perUnitItemType"/>
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  <xs:element id="sm_GasContractsMember" abstract="true" name="GasContractsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_GasBasisSwapContractFourthQuarterYear1Member" abstract="true" name="GasBasisSwapContractFourthQuarterYear1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_A50SeniorUnsecuredNotesDue2024Member" abstract="true" name="A50SeniorUnsecuredNotesDue2024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_EmployeeStockPurchasePlanMember" abstract="true" name="EmployeeStockPurchasePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_NYMEXOilCollarContractYear2Member" abstract="true" name="NYMEXOilCollarContractYear2Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_IfHscMember" abstract="true" name="IfHscMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_OilBasisSwapContractYear2Member" abstract="true" name="OilBasisSwapContractYear2Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_ScheduleOfLongTermDebtInstrumentsUnsecuredTableTextBlock" abstract="false" name="ScheduleOfLongTermDebtInstrumentsUnsecuredTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="sm_OilandCondensateRevenueMember" abstract="true" name="OilandCondensateRevenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_LineofCreditFacilityAggregateLenderCommitments" abstract="false" name="LineofCreditFacilityAggregateLenderCommitments" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="sm_NGLSwapsContractYear2Member" abstract="true" name="NGLSwapsContractYear2Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_GasCollarContractFourthQuarterYear1Member" abstract="true" name="GasCollarContractFourthQuarterYear1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_AcceleratedUnamortizedDeferredFinancingCostsMember" abstract="true" name="AcceleratedUnamortizedDeferredFinancingCostsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_OPISNormalButaneMontBelvieuMember" abstract="true" name="OPISNormalButaneMontBelvieuMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_GasSwapsContractYear3Member" abstract="true" name="GasSwapsContractYear3Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_NYMEXOilCalendarMonthAverageRollDifferentialContractYear3Member" abstract="true" name="NYMEXOilCalendarMonthAverageRollDifferentialContractYear3Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_GasSwapsContractFourthQuarterYear1Member" abstract="true" name="GasSwapsContractFourthQuarterYear1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sm_IFWAHAMember" abstract="true" name="IFWAHAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodMultiplierAssumed" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodMultiplierAssumed" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:decimalItemType"/>
  <xs:element id="sm_NGLCollarContractFourthQuarterYear1Member" abstract="true" name="NGLCollarContractFourthQuarterYear1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_WTIHoustonMEHNYMEXWTIMember" abstract="true" name="WTIHoustonMEHNYMEXWTIMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_MidlandBasinMember" abstract="true" name="MidlandBasinMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_SupplementalCashFlowInformationOperatingActivitiesAbstract" abstract="true" name="SupplementalCashFlowInformationOperatingActivitiesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="sm_DerivativeUnderlyingIndexDomain" abstract="true" name="DerivativeUnderlyingIndexDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sm_DerivativeUnderlyingIndexAxis" abstract="true" name="DerivativeUnderlyingIndexAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
</xs:schema>
