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  <element id="xec_OilAndGasDeliveryCommitmentsAndContractsPeriod" name="OilAndGasDeliveryCommitmentsAndContractsPeriod" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <xsd:element id="xec_MaximumFinancialCommitmentResultingFromInabilityToMeetGasDeliveryCommitments" name="MaximumFinancialCommitmentResultingFromInabilityToMeetGasDeliveryCommitments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="xec_TripleCrownGasGatheringAndProcessingSystemMember" name="TripleCrownGasGatheringAndProcessingSystemMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="xec_TexasMember" name="TexasMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="xec_PurchaseOfAdditionalInterestsInOilAndGasProperties" name="PurchaseOfAdditionalInterestsInOilAndGasProperties" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <xsd:element id="xec_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitedAndRetired" name="StockIssuedDuringPeriodValueRestrictedStockAwardForfeitedAndRetired" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="xec_StockIssuedDuringPeriodValueAcceleratedVestingOfStockOptionsRestrictedStockAndRestrictedStockUnits" name="StockIssuedDuringPeriodValueAcceleratedVestingOfStockOptionsRestrictedStockAndRestrictedStockUnits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="xec_StockIssuedDuringPeriodSharesVestingOfRestrictedStockUnits" name="StockIssuedDuringPeriodSharesVestingOfRestrictedStockUnits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="xec_GasMarketingRelatedCosts" name="GasMarketingRelatedCosts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="xec_PercentOfInterestSoldInProperty" name="PercentOfInterestSoldInProperty" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="xec_PropertySales" name="PropertySales" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="xec_IncreaseDecreaseInLossContingencyLossInPeriod" name="IncreaseDecreaseInLossContingencyLossInPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <xsd:element id="xec_DeferredTaxAssetsOperatingLossCarryforwardsDomesticValuationAllowanceAllocatedToContributedCapital" name="DeferredTaxAssetsOperatingLossCarryforwardsDomesticValuationAllowanceAllocatedToContributedCapital" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="xec_TransportationProcessingAndOtherOperatingCosts" name="TransportationProcessingAndOtherOperatingCosts" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="xec_Notes4375Member" name="Notes4375Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="xec_PeriodOfMaturityDateExtension" name="PeriodOfMaturityDateExtension" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="xec_Assetretirementobligationliabilitiessettledportionrelatedtopropertiessold" name="Assetretirementobligationliabilitiessettledportionrelatedtopropertiessold" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="xec_AccountsReceivableTradeNetCurrent" name="AccountsReceivableTradeNetCurrent" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="xec_ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCostLowerThanPreviousYearDueToTimingOfAwardsGranted" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCostLowerThanPreviousYearDueToTimingOfAwardsGranted" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="xec_ResidueGasAndNglsPortionReflectedInRealizedPrices" name="ResidueGasAndNglsPortionReflectedInRealizedPrices" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="xec_DeferredTaxAssetsOperatingLossCarryforwardsNet" name="DeferredTaxAssetsOperatingLossCarryforwardsNet" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
</xsd:schema>


