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  <xsd:element abstract="true" id="nbl_AcquisitionsAndDispositionsAbstract" name="AcquisitionsAndDispositionsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_AmountOfGainLossOnDerivativeInstrumentsRecognizedInOtherComprehensiveIncomeLoss" name="AmountOfGainLossOnDerivativeInstrumentsRecognizedInOtherComprehensiveIncomeLoss" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="nbl_AoclAmountNetOfTaxToBeReclassifiedToInterestExpenseOverLifeOfDebt" name="AoclAmountNetOfTaxToBeReclassifiedToInterestExpenseOverLifeOfDebt" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="nbl_AssetImpairments" name="AssetImpairments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="nbl_AssetRetirementObligationOther" name="AssetRetirementObligationOther" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="nbl_AssetRetirementObligationsAssociatedWithNorthSeaAhfs" name="AssetRetirementObligationsAssociatedWithNorthSeaAhfs" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="nbl_AssetsNetOfAhfs" name="AssetsNetOfAhfs" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="nbl_BasisOfPresentationAbstract" name="BasisOfPresentationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_BasisSwaps1Member" name="BasisSwaps1Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_BlocksOAndIOffshoreEquatorialGuineaMember" name="BlocksOAndIOffshoreEquatorialGuineaMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_BusinessAcquisitionPurchasePriceAllocationProvedOilAndGasProperties" name="BusinessAcquisitionPurchasePriceAllocationProvedOilAndGasProperties" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="nbl_BusinessAcquisitionPurchasePriceAllocationUnprovedOilAndGasProperties" name="BusinessAcquisitionPurchasePriceAllocationUnprovedOilAndGasProperties" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="nbl_BusinessAcquisitionsCostOfAcquiredEntityPurchasePrice" name="BusinessAcquisitionsCostOfAcquiredEntityPurchasePrice" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="nbl_CapitalizedExploratoryWellCostOther" name="CapitalizedExploratoryWellCostOther" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_ChinaMember" name="ChinaMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_CommoditySalesReceivable" name="CommoditySalesReceivable" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="nbl_ConsolInstallmentPaymentsDueSeptember302012And2013Member" name="ConsolInstallmentPaymentsDueSeptember302012And2013Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_CrudeOilCommodityContractMember" name="CrudeOilCommodityContractMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_CurrentAssetsMember" name="CurrentAssetsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_CurrentLiabilitiesMember" name="CurrentLiabilitiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_DalitIsraelMember" name="DalitIsraelMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_DebtAbstract" name="DebtAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_DebtInstrumentMaturityDates" name="DebtInstrumentMaturityDates" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_DeepwaterGulfOfMexicoMoratoriumExpense" name="DeepwaterGulfOfMexicoMoratoriumExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="nbl_DeferredIncomeTaxes" name="DeferredIncomeTaxes" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="nbl_DepreciationDepletionAndAmortizationIncludingDiscontinuedOperations" name="DepreciationDepletionAndAmortizationIncludingDiscontinuedOperations" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_DerivativeByRiskAxis" name="DerivativeByRiskAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_DerivativeByRiskDomain" name="DerivativeByRiskDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_DerivativeInstrumentsAndHedgingActivitiesAbstract" name="DerivativeInstrumentsAndHedgingActivitiesAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_DerivativeProductionPeriod" name="DerivativeProductionPeriod" nillable="true" substitutionGroup="xbrli:item" type="us-types:dateStringItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_DerivativeWeightedAverageDifferential" name="DerivativeWeightedAverageDifferential" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="nbl_DiscountRateForImpairmentModel" name="DiscountRateForImpairmentModel" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="nbl_DisposcalGroupIncludingDiscontinuedOperationsDeferredTaxLiabilityNoncurrent" name="DisposcalGroupIncludingDiscontinuedOperationsDeferredTaxLiabilityNoncurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="nbl_EarningAdjustmentAssumedConversionOfDilutiveShares" name="EarningAdjustmentAssumedConversionOfDilutiveShares" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="nbl_EastTexasOnshoreUs" name="EastTexasOnshoreUs" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_EquatorialGuineaMember" name="EquatorialGuineaMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_ExpectedDivestitureProceeds" name="ExpectedDivestitureProceeds" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="nbl_ExpectedIncomeTaxBenefit" name="ExpectedIncomeTaxBenefit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="nbl_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisDisclosureItemsAxis" name="FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisDisclosureItemsAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisDisclosureItemsDomain" name="FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisDisclosureItemsDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisLineItems" name="FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTable" name="FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_FairValueInputsAdjustmentMember" name="FairValueInputsAdjustmentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_FairValueLiabilitiesMeasuredOnRecurringBasisCommodityDerivativeFinancialInstrumentsLiabilities" name="FairValueLiabilitiesMeasuredOnRecurringBasisCommodityDerivativeFinancialInstrumentsLiabilities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="nbl_FairValueLiabilitiesMeasuredOnRecurringBasisDeferredCompensationLiability" name="FairValueLiabilitiesMeasuredOnRecurringBasisDeferredCompensationLiability" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="nbl_FairValueLiabilitiesMeasuredOnRecurringBasisInterestRateDerivativeFinancialInstrumentsLiabilities" name="FairValueLiabilitiesMeasuredOnRecurringBasisInterestRateDerivativeFinancialInstrumentsLiabilities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="nbl_FinancialAssetsAbstract" name="FinancialAssetsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_FinancialLiabilitiesAbstract" name="FinancialLiabilitiesAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_FundingOfJointVenturesFutureDrillingAndCompletionCosts" name="FundingOfJointVenturesFutureDrillingAndCompletionCosts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_GunflintDeepwaterGulfOfMexicoMember" name="GunflintDeepwaterGulfOfMexicoMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_ImpairmentsAbstract" name="ImpairmentsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_IncomeLossFromContinuingOperationsAvailableToCommonStockholdersDiluted" name="IncomeLossFromContinuingOperationsAvailableToCommonStockholdersDiluted" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="nbl_IncomeTaxExaminationEarliestYearUnderExamination" name="IncomeTaxExaminationEarliestYearUnderExamination" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_IncreaseDecreaseInCurrentIncomeTaxesPayable" name="IncreaseDecreaseInCurrentIncomeTaxesPayable" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="nbl_IndexLessDifferential" name="IndexLessDifferential" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_InstallmentPaymentCurrentDueOnJointPartnership" name="InstallmentPaymentCurrentDueOnJointPartnership" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="nbl_InterestInDumbartonAndLochranzaFields" name="InterestInDumbartonAndLochranzaFields" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="nbl_IsraelMember" name="IsraelMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_Leviathan1DeepOffshoreIsraelMember" name="Leviathan1DeepOffshoreIsraelMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_LeviathanMember" name="LeviathanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_MarcellusShaleJointVentureAbstract" name="MarcellusShaleJointVentureAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_MaximumAmountToBePaidEachCalendarYearForFundingOfFutureDrillingAndCompletionCosts" name="MaximumAmountToBePaidEachCalendarYearForFundingOfFutureDrillingAndCompletionCosts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="nbl_MutualFundInvestments" name="MutualFundInvestments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="nbl_NaturalGasCommodityContractMember" name="NaturalGasCommodityContractMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_NaturalGasPriceAgreedUponBenchmarkAverage" name="NaturalGasPriceAgreedUponBenchmarkAverage" nillable="true" substitutionGroup="xbrli:item" type="xbrli:decimalItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_NetBookValueMember" name="NetBookValueMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_NetLiabilityPositionOfSettledInterestRateSwap" name="NetLiabilityPositionOfSettledInterestRateSwap" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="nbl_NetherlandsMember" name="NetherlandsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_NoncurrentAssetsMember" name="NoncurrentAssetsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_NoncurrentLiabilitiesMember" name="NoncurrentLiabilitiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_NoncurrentLiabilitiesOther" name="NoncurrentLiabilitiesOther" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="nbl_NorthSeaDivestitureAbstract" name="NorthSeaDivestitureAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_NorthSeaMember" name="NorthSeaMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_OnshoreUsSubsequentAssetSalesNetBookValue" name="OnshoreUsSubsequentAssetSalesNetBookValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="nbl_OnshoreUsSubsequentAssetSalesProceeds" name="OnshoreUsSubsequentAssetSalesProceeds" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="nbl_OrganizationAndNatureOfOperationsAbstract" name="OrganizationAndNatureOfOperationsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_OtherCurrentAssetsAbstract" name="OtherCurrentAssetsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_OtherIncomeExpenseNet" name="OtherIncomeExpenseNet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_OtherInternationalAndCorporateMember" name="OtherInternationalAndCorporateMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_OtherNoncurrentAssets" name="OtherNoncurrentAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="nbl_OtherOperatingExpenseNetAbstract" name="OtherOperatingExpenseNetAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_OtherPrimarilyOnshoreUs" name="OtherPrimarilyOnshoreUs" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_OtherProjectsMember" name="OtherProjectsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_OtherRevenuesAbstract" name="OtherRevenuesAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_PayableWithImputedInterestDiscount" name="PayableWithImputedInterestDiscount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="nbl_PaymentsOnVentureToExploreAndDevelopOilAndGasProperties" name="PaymentsOnVentureToExploreAndDevelopOilAndGasProperties" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_PendingSaleOfOnshoreUsPropertiesAbstract" name="PendingSaleOfOnshoreUsPropertiesAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_PeriodOverWhichCarriedCostObligationIsExpectedToExtend" name="PeriodOverWhichCarriedCostObligationIsExpectedToExtend" nillable="true" substitutionGroup="xbrli:item" type="us-types:durationStringItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_PiceanceOnshoreUs" name="PiceanceOnshoreUs" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="nbl_ProbableInsuranceClaimsCurrent" name="ProbableInsuranceClaimsCurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="nbl_ProductionAndAdValoremTaxExpense" name="ProductionAndAdValoremTaxExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="nbl_ProductionExpense" name="ProductionExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_ProductonExpenseAbstract" name="ProductonExpenseAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_RatioOfFundingOnShareOfFutureDrillingAndCompletionCosts" name="RatioOfFundingOnShareOfFutureDrillingAndCompletionCosts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="instant" />
  <xsd:element id="nbl_RemainingAnnualInstallmentsToPurchaseJointVenturePartnership" name="RemainingAnnualInstallmentsToPurchaseJointVenturePartnership" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_RepaymentOfCapitalLeaseObligation" name="RepaymentOfCapitalLeaseObligation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="nbl_RevolvingCreditFacilityTerms" name="RevolvingCreditFacilityTerms" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_ScheduleOfOtherBalanceSheetInformationTextBlock" name="ScheduleOfOtherBalanceSheetInformationTextBlock" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_ScheduleOfOtherOperationsInformationTextBlock" name="ScheduleOfOtherOperationsInformationTextBlock" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_SeniorNotesDueApril12027Member" name="SeniorNotesDueApril12027Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_SeniorNotesDueApril152014Member" name="SeniorNotesDueApril152014Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_SeniorNotesDueAugust12097Member" name="SeniorNotesDueAugust12097Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_SeniorNotesDueDecember152021Member" name="SeniorNotesDueDecember152021Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_SeniorNotesDueMarch12019Member" name="SeniorNotesDueMarch12019Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_SeniorNotesDueMarch12041Member" name="SeniorNotesDueMarch12041Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_SouthRatonDeepwaterGulfOfMexico" name="SouthRatonDeepwaterGulfOfMexico" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_Swaps1Member" name="Swaps1Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_Swaps2Member" name="Swaps2Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_Swaps3Member" name="Swaps3Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_Swaps4Member" name="Swaps4Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_Swaps5Member" name="Swaps5Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_Swaps6Member" name="Swaps6Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_ThreeWayCollars1Member" name="ThreeWayCollars1Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_ThreeWayCollars2Member" name="ThreeWayCollars2Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_ThreeWayCollars3Member" name="ThreeWayCollars3Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_ThreeWayCollars4Member" name="ThreeWayCollars4Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_ThreeWayCollars5Member" name="ThreeWayCollars5Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_TotalPurchasePriceAbstract" name="TotalPurchasePriceAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_TwoWayCollar1Member" name="TwoWayCollar1Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_TwoWayCollar2Member" name="TwoWayCollar2Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_UkMember" name="UkMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="nbl_UndevelopedAcresPurchased" name="UndevelopedAcresPurchased" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_UnitedStatesMember" name="UnitedStatesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_YearsRemainingOpenToExaminationAbstract" name="YearsRemainingOpenToExaminationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nbl_YoyoOffshoreCameronMember" name="YoyoOffshoreCameronMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
</xsd:schema>
</XBRL>