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  <xs:element id="oxy_DisposalGroupIncludingDiscontinuedOperationCashPurchasePrice" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationCashPurchasePrice" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oxy_DisposalGroupIncludingDiscontinuedOperationClosingAdjustmentsAbstract" abstract="true" name="DisposalGroupIncludingDiscontinuedOperationClosingAdjustmentsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="oxy_DisposalGroupIncludingDiscontinuedOperationWorkingCapitalAdjustment" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationWorkingCapitalAdjustment" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oxy_DisposalGroupIncludingDiscontinuedOperationPostCloseAdjustments" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationPostCloseAdjustments" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oxy_DisposalGroupIncludingDiscontinuedOperationCashPurchasePriceNet" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationCashPurchasePriceNet" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oxy_DisposalGroupIncludingDiscontinuedOperationRevenueAndOtherIncomeAbstract" abstract="true" name="DisposalGroupIncludingDiscontinuedOperationRevenueAndOtherIncomeAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="oxy_DisposalGroupIncludingDiscontinuedOperationInterestDividendsAndOtherIncome" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationInterestDividendsAndOtherIncome" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oxy_DisposalGroupIncludingDiscontinuedOperationGainsOnSalesOfAssetsAndOthersNet" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationGainsOnSalesOfAssetsAndOthersNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oxy_DisposalGroupIncludingDiscontinuedOperationRevenuesOperatingAndNonoperating" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationRevenuesOperatingAndNonoperating" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oxy_DisposalGroupIncludingDiscontinuedOperationCostsAndOtherDeductionsAbstract" abstract="true" name="DisposalGroupIncludingDiscontinuedOperationCostsAndOtherDeductionsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="oxy_DisposalGroupIncludingDiscontinuedOperationOtherOperatingAndNonOperatingExpense" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationOtherOperatingAndNonOperatingExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oxy_DisposalGroupIncludingDiscontinuedOperationAcquisitionRelatedCosts" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationAcquisitionRelatedCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oxy_DisposalGroupIncludingDiscontinuedOperationOtherExpenseNet" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationOtherExpenseNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oxy_DisposalGroupIncludingDiscontinuedOperationCostsAndOtherDeductionsNet" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationCostsAndOtherDeductionsNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oxy_DisposalGroupIncludingDiscontinuedOperationIncomeFromEquityInvestmentsAndOther" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationIncomeFromEquityInvestmentsAndOther" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oxy_DisposalGroupIncludingDiscontinuedOperationIncomeLossBeforeIncomeTaxes" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationIncomeLossBeforeIncomeTaxes" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oxy_CrudeCollarsMember" abstract="true" name="CrudeCollarsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oxy_DerivativeAverageCeilingPrice" abstract="false" name="DerivativeAverageCeilingPrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="srt-types:perUnitItemType"/>
  <xs:element id="oxy_MarketingDerivativesMember" abstract="true" name="MarketingDerivativesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oxy_NaturalGasPerCubicFootMember" abstract="true" name="NaturalGasPerCubicFootMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oxy_DiscontinuedOperationEffectiveTaxRateOfDiscontinuedOperation" abstract="false" name="DiscontinuedOperationEffectiveTaxRateOfDiscontinuedOperation" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oxy_NonNationalPrioritiesListSitesMember" abstract="true" name="NonNationalPrioritiesListSitesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oxy_DiamondAlkaliSuperfundSiteMember" abstract="true" name="DiamondAlkaliSuperfundSiteMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oxy_DiamondAlkaliSuperfundSiteOperableUnitOneMember" abstract="true" name="DiamondAlkaliSuperfundSiteOperableUnitOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oxy_DiamondAlkaliSuperfundSiteOperableUnitTwoMember" abstract="true" name="DiamondAlkaliSuperfundSiteOperableUnitTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oxy_DiamondAlkaliSuperfundSiteOperableUnitFourMember" abstract="true" name="DiamondAlkaliSuperfundSiteOperableUnitFourMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oxy_AldenLeedsMember" abstract="true" name="AldenLeedsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oxy_EnvironmentalRemediationSitesNumber" abstract="false" name="EnvironmentalRemediationSitesNumber" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="oxy_EnvironmentalRemediationContingencyNumberOfSiteCategories" abstract="false" name="EnvironmentalRemediationContingencyNumberOfSiteCategories" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="oxy_EnvironmentalReservesExceedingTenMillionThresholdValueSiteCategory" abstract="false" name="EnvironmentalReservesExceedingTenMillionThresholdValueSiteCategory" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oxy_EnvironmentalReservesExceedingTenMillionSiteCategoryNumberOfSites" abstract="false" name="EnvironmentalReservesExceedingTenMillionSiteCategoryNumberOfSites" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="oxy_EnvironmentalReservesRangeBetweenZeroToOneMillionSiteCategoryNumberOfSites" abstract="false" name="EnvironmentalReservesRangeBetweenZeroToOneMillionSiteCategoryNumberOfSites" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="oxy_EnvironmentalReservesRangeBetweenZeroToOneMillionThresholdValueSiteCategory" abstract="false" name="EnvironmentalReservesRangeBetweenZeroToOneMillionThresholdValueSiteCategory" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oxy_PercentOfEnvironmentalReservesToBeFundedInThreeToFourYears" abstract="false" name="PercentOfEnvironmentalReservesToBeFundedInThreeToFourYears" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oxy_PeriodOfExpending30PercentOfEnvironmentalReserves" abstract="false" name="PeriodOfExpending30PercentOfEnvironmentalReserves" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="oxy_MinimumPeriodOfExpendingSecondHalfOfEnvironmentalReserves" abstract="false" name="MinimumPeriodOfExpendingSecondHalfOfEnvironmentalReserves" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="oxy_EnvironmentalRemediationPossibleAdditionalLossBeyondAccruals" abstract="false" name="EnvironmentalRemediationPossibleAdditionalLossBeyondAccruals" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oxy_SiteContingencyNumberOfOperatingUnits" abstract="false" name="SiteContingencyNumberOfOperatingUnits" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="oxy_RiverStretchWhichRequireRemedialActions" abstract="false" name="RiverStretchWhichRequireRemedialActions" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:lengthItemType"/>
  <xs:element id="oxy_RiverStretchWhichMayRequireRemedialActions" abstract="false" name="RiverStretchWhichMayRequireRemedialActions" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:lengthItemType"/>
  <xs:element id="oxy_NumberOfPartiesSettled" abstract="false" name="NumberOfPartiesSettled" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="oxy_NumberOfCompaniesExcludedFromSettlement" abstract="false" name="NumberOfCompaniesExcludedFromSettlement" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="oxy_EnvironmentalExitCostsCleanUpCostsPercentage" abstract="false" name="EnvironmentalExitCostsCleanUpCostsPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oxy_AccruedLiabilitiesNonCurrentAbstract" abstract="true" name="AccruedLiabilitiesNonCurrentAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="oxy_NationalPrioritiesListSitesMember" abstract="true" name="NationalPrioritiesListSitesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oxy_ThirdPartySitesMember" abstract="true" name="ThirdPartySitesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oxy_EntityOperatedSitesMember" abstract="true" name="EntityOperatedSitesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oxy_ClosedOrNonOperatedEntitySitesMember" abstract="true" name="ClosedOrNonOperatedEntitySitesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oxy_AnadarkoPetroleumCorporationMember" abstract="true" name="AnadarkoPetroleumCorporationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oxy_TronoxSettlementMember" abstract="true" name="TronoxSettlementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oxy_IncomeTaxExpenseBenefitFromReorganization" abstract="false" name="IncomeTaxExpenseBenefitFromReorganization" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oxy_AdditionalCashTaxBenefitsRealizedFromUtilizationOfTaxAttributesFromDeductionOfLegalSettlement" abstract="false" name="AdditionalCashTaxBenefitsRealizedFromUtilizationOfTaxAttributesFromDeductionOfLegalSettlement" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oxy_PaymentsForLegalSettlementsInterestAmount" abstract="false" name="PaymentsForLegalSettlementsInterestAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oxy_LossContingencyPotentialIncomeTaxExpenseBenefit" abstract="false" name="LossContingencyPotentialIncomeTaxExpenseBenefit" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oxy_LossContingencyPotentialIncomeTaxExpenseBenefitAccruedInterest" abstract="false" name="LossContingencyPotentialIncomeTaxExpenseBenefitAccruedInterest" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oxy_StrikePriceOneMember" abstract="true" name="StrikePriceOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oxy_StrikePriceTwoMember" abstract="true" name="StrikePriceTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oxy_ClassOfWarrantOrRightExercised" abstract="false" name="ClassOfWarrantOrRightExercised" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="oxy_ClassOfWarrantOrRightTemporarilyReducedExercisePriceOfWarrantsOrRights" abstract="false" name="ClassOfWarrantOrRightTemporarilyReducedExercisePriceOfWarrantsOrRights" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="oxy_CorporateAndEliminationsMember" abstract="true" name="CorporateAndEliminationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oxy_OtherOperatingSegmentsAndIntersegmentEliminationsMember" abstract="true" name="OtherOperatingSegmentsAndIntersegmentEliminationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oxy_AssetsHeldForSaleMember" abstract="true" name="AssetsHeldForSaleMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
