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<import namespace="http://www.xbrl.org/2009/arcrole/fact-explanatoryFact" schemaLocation="http://www.xbrl.org/lrr/arcrole/factExplanatory-2009-12-16.xsd"/>
<import namespace="http://xbrl.sec.gov/dei/2018-01-31" schemaLocation="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd"/>
<import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd"/>
<import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd"/>
<import namespace="http://fasb.org/us-types/2018-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2018/elts/us-types-2018-01-31.xsd"/>
<import  namespace="http://fasb.org/us-roles/2018-01-31"  schemaLocation="http://xbrl.fasb.org/us-gaap/2018/elts/us-roles-2018-01-31.xsd"/>
<import  namespace="http://fasb.org/srt-types/2018-01-31"  schemaLocation="http://xbrl.fasb.org/srt/2018/elts/srt-types-2018-01-31.xsd"/>
<import  namespace="http://fasb.org/srt/2018-01-31"  schemaLocation="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd"/>
<element name="DocumentAndEntityInformationAbstract" id="zn_DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="GovernmentalReceivables" id="zn_GovernmentalReceivables" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="PropertyPlantAndEquipmentCostAbstract" id="zn_PropertyPlantAndEquipmentCostAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="LeaseObligationsCurrent" id="zn_LeaseObligationsCurrent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" />
<element name="SeniorConvertibleBonds" id="zn_SeniorConvertibleBonds" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" />
<element name="LeaseObligationsNoncurrent" id="zn_LeaseObligationsNoncurrent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" />
<element name="EmployeeRelatedLiabilitiesNoncurrent" id="zn_EmployeeRelatedLiabilitiesNoncurrent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" />
<element name="MaturitiesCapitalLease" id="zn_MaturitiesCapitalLease" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="ImpairmentOfUnprovedOilAndGasProperties" id="zn_ImpairmentOfUnprovedOilAndGasProperties" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="StockIssuedDuringPeriodValueStockDividendReinvestmentAndDirectStockPurchasePlan" id="zn_StockIssuedDuringPeriodValueStockDividendReinvestmentAndDirectStockPurchasePlan" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" />
<element name="StockIssuedDuringPeriodSharesStockDividendReinvestmentAndDirectStockPurchasePlan" id="zn_StockIssuedDuringPeriodSharesStockDividendReinvestmentAndDirectStockPurchasePlan" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="AdjustmentsToAdditionalPaidInCapitalOptionIssued" id="zn_AdjustmentsToAdditionalPaidInCapitalOptionIssued" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" />
<element name="AdjustmentOfOptionsGrantedForServices" id="zn_AdjustmentOfOptionsGrantedForServices" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="IncreaseDecreaseInLeaseObligationCurrent" id="zn_IncreaseDecreaseInLeaseObligationCurrent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="IncreaseDecreaseInLeaseObligationNonCurrent" id="zn_IncreaseDecreaseInLeaseObligationNonCurrent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="IncreaseDecreaseInRightOfUseLeaseAssets" id="zn_IncreaseDecreaseInRightOfUseLeaseAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" />
<element name="IncreaseDecreaseInAccruedSeverancePayNetOfSeverancePayFund" id="zn_IncreaseDecreaseInAccruedSeverancePayNetOfSeverancePayFund" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="RepaymentsOfCapitalLoan" id="zn_RepaymentsOfCapitalLoan" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" />
<element name="ProceedsFromDeferredOfferingCost" id="zn_ProceedsFromDeferredOfferingCost" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="ProceedsFromIssuanceOfCommonStockAndWarrantsNet" id="zn_ProceedsFromIssuanceOfCommonStockAndWarrantsNet" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="CapitalizedCostsOfOptionsRelatedToOilAndGasProperties" id="zn_CapitalizedCostsOfOptionsRelatedToOilAndGasProperties" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" />
<element name="ConvertibleBondInterestPaidInShares" id="zn_ConvertibleBondInterestPaidInShares" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" />
<element name="ConvertibleSharesRelatedToSeniorConvertibleBonds" id="zn_ConvertibleSharesRelatedToSeniorConvertibleBonds" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="AcquisitionOfPropertyAndEquipmentUnderCapitalLease" id="zn_AcquisitionOfPropertyAndEquipmentUnderCapitalLease" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" />
<element name="CapitalizedConvertibleBondInterestAttributedToOilAndGasProperties" id="zn_CapitalizedConvertibleBondInterestAttributedToOilAndGasProperties" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" />
<element name="RelatedPartiesPolicyTextBlock" id="zn_RelatedPartiesPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="FinancialStatementsInUnitedStatesDollarsPolicyTextBlock" id="zn_FinancialStatementsInUnitedStatesDollarsPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="FixedShortTermTimeDepositsPolicyTextBlock" id="zn_FixedShortTermTimeDepositsPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="FixedLongTermTimeDepositsPolicyTextBlock" id="zn_FixedLongTermTimeDepositsPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="NonEmployeeMember" id="zn_NonEmployeeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="EmployeesAndDirectorsMember" id="zn_EmployeesAndDirectorsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="EmployeeMember" id="zn_EmployeeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="EmployeesAndNonEmployeesMember" id="zn_EmployeesAndNonEmployeesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="WarrantsAndOptionsMember" id="zn_WarrantsAndOptionsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="DividendReinvestmentAndStockPurchasePlanMember" id="zn_DividendReinvestmentAndStockPurchasePlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ScheduleOfWarrantsAndOptionsExercisePricesAndExpirationDatesTableTextBlock" id="zn_ScheduleOfWarrantsAndOptionsExercisePricesAndExpirationDatesTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ScheduleOfOperatingLeaseAssetsAndLiabilitiesTableTextBlock" id="zn_ScheduleOfOperatingLeaseAssetsAndLiabilitiesTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ScheduleOfWeightedAverageLeaseTermAndDiscountRateTableTextBlock" id="zn_ScheduleOfWeightedAverageLeaseTermAndDiscountRateTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="NatureOfOperationsAndGoingConcernTable" id="zn_NatureOfOperationsAndGoingConcernTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" />
<element name="MegiddoJezreelLicenseMember" id="zn_MegiddoJezreelLicenseMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="JordanValleyLicenseMember" id="zn_JordanValleyLicenseMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="NatureOfOperationsAndGoingConcernLineItems" id="zn_NatureOfOperationsAndGoingConcernLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="NatureOfOperationsBasisOfPresentationAndGoingConcernTextualAbstract" id="zn_NatureOfOperationsBasisOfPresentationAndGoingConcernTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="InitialLengthLeaseTerm" id="zn_InitialLengthLeaseTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="SummaryOfSignificantAccountingPoliciesTextualAbstract" id="zn_SummaryOfSignificantAccountingPoliciesTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageExercisePriceAbstract" id="zn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageExercisePriceAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="VestedMember" id="zn_VestedMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="NonVestedMember" id="zn_NonVestedMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesOneMember" id="zn_RangesOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesTwoMember" id="zn_RangesTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesThreeMember" id="zn_RangesThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesFourMember" id="zn_RangesFourMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesFiveMember" id="zn_RangesFiveMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesSixMember" id="zn_RangesSixMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesSevenMember" id="zn_RangesSevenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesEightMember" id="zn_RangesEightMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesNineMember" id="zn_RangesNineMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesTenMember" id="zn_RangesTenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesElevenMember" id="zn_RangesElevenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesTwelveMember" id="zn_RangesTwelveMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesThirteenMember" id="zn_RangesThirteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesFourteenMember" id="zn_RangesFourteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesFifteenMember" id="zn_RangesFifteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesSixteenMember" id="zn_RangesSixteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesSeventeenMember" id="zn_RangesSeventeenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesEighteenMember" id="zn_RangesEighteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesNineteenMember" id="zn_RangesNineteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesTwentyMember" id="zn_RangesTwentyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesTwentyOneMember" id="zn_RangesTwentyOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesTwentyTwoMember" id="zn_RangesTwentyTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesTwentyThreeMember" id="zn_RangesTwentyThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesTwentyFourMember" id="zn_RangesTwentyFourMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesTwentyFiveMember" id="zn_RangesTwentyFiveMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesTwentySixMember" id="zn_RangesTwentySixMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesTwentySevenMember" id="zn_RangesTwentySevenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesTwentyEightMember" id="zn_RangesTwentyEightMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesTwentyNineMember" id="zn_RangesTwentyNineMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesThirtyMember" id="zn_RangesThirtyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RangesThirtyOneMember" id="zn_RangesThirtyOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="SharesUnderlyingOutstandingOptionsAbstract" id="zn_SharesUnderlyingOutstandingOptionsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePrice" id="zn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePrice" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ZnwaaWarrantsMember" id="zn_ZnwaaWarrantsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ZnwadWarrantsMember" id="zn_ZnwadWarrantsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ZnwaeWarrantsMember" id="zn_ZnwaeWarrantsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ZnwafMember" id="zn_ZnwafMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ZnwagMember" id="zn_ZnwagMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ZnwahMember" id="zn_ZnwahMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ZnwaiWarrantsMember" id="zn_ZnwaiWarrantsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ZnwajWarrantsMember" id="zn_ZnwajWarrantsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ZnwakWarrantsMember" id="zn_ZnwakWarrantsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ReportingDateAxis" id="zn_ReportingDateAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem" />
<element name="ReportingDateDomain" id="zn_ReportingDateDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="BeginningDateMember" id="zn_BeginningDateMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="EndingDateMember" id="zn_EndingDateMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="FebruaryTwoZeroOneEightMember" id="zn_FebruaryTwoZeroOneEightMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ClassOfWarrantOrRightExpiryDateOfWarrantsOrRightExercisable" id="zn_ClassOfWarrantOrRightExpiryDateOfWarrantsOrRightExercisable" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="WarrantTransactionsMember" id="zn_WarrantTransactionsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="WarrantTerminationDate" id="zn_WarrantTerminationDate" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="WarrantsIssued" id="zn_WarrantsIssued" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ClassOfWarrantsExercised" id="zn_ClassOfWarrantsExercised" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ClassOfWarrantsExpired" id="zn_ClassOfWarrantsExpired" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="SeniorOfficersStaffMembersAndConsultantsMember" id="zn_SeniorOfficersStaffMembersAndConsultantsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="SeniorOfficerMember" id="zn_SeniorOfficerMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ConsultantMember" id="zn_ConsultantMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="EightBoardMembersMember" id="zn_EightBoardMembersMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="StockOptionPlanTwentyElevenMember" id="zn_StockOptionPlanTwentyElevenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="NonEmployeeDirectorsStockOptionPlanMember" id="zn_NonEmployeeDirectorsStockOptionPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ExercisableThroughJuneThirtyTwoThousandEighteenMember" id="zn_ExercisableThroughJuneThirtyTwoThousandEighteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ExercisableThroughDecemberThirtyOneTwoThousandEighteenMember" id="zn_ExercisableThroughDecemberThirtyOneTwoThousandEighteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ExercisableThroughJuneThreeZeroTwoZeroOneNineMember" id="zn_ExercisableThroughJuneThreeZeroTwoZeroOneNineMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="StockholdersEquityTextualAbstract" id="zn_StockholdersEquityTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ShareBasedCompensationArrangementBySharebasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue" id="zn_ShareBasedCompensationArrangementBySharebasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedDescription" id="zn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="NewUnitProgramMember" id="zn_NewUnitProgramMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="UnitOptionProgramMember" id="zn_UnitOptionProgramMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="SubscriptionRightsOfferingMember" id="zn_SubscriptionRightsOfferingMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="UnitOptionDescription" id="zn_UnitOptionDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="WarrantTerminationDateDescription" id="zn_WarrantTerminationDateDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="SubscriptionRightsOffering" id="zn_SubscriptionRightsOffering" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ExpensesFromRightsOffering" id="zn_ExpensesFromRightsOffering" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="ExcludedFromAmortizationBaseAbstract" id="zn_ExcludedFromAmortizationBaseAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="OperationalCosts" id="zn_OperationalCosts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="CapitalizedSalaryCostsUnprovedProperties" id="zn_CapitalizedSalaryCostsUnprovedProperties" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="LegalCostsLicenseFeesAndPreparationCosts" id="zn_LegalCostsLicenseFeesAndPreparationCosts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="OtherUtilityCost" id="zn_OtherUtilityCost" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="ChangesInDrillingCostsAndOtherOperationalRelatedCosts" id="zn_ChangesInDrillingCostsAndOtherOperationalRelatedCosts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="ChangesInCapitalizedSalaryCostsUnprovedProperties" id="zn_ChangesInCapitalizedSalaryCostsUnprovedProperties" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="IncreaseDecreaseInInterestCostsCapitalized" id="zn_IncreaseDecreaseInInterestCostsCapitalized" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="IncreaseDecreaseInLegalCostsLicenseFeesAndPreparationCosts" id="zn_IncreaseDecreaseInLegalCostsLicenseFeesAndPreparationCosts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="IncreaseDecreaseInOtherUtilityCosts" id="zn_IncreaseDecreaseInOtherUtilityCosts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="IncreaseDecreaseInCapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationPeriodCost" id="zn_IncreaseDecreaseInCapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationPeriodCost" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="UnprovedOilAndGasPropertiesFullCostMethodTextualAbstract" id="zn_UnprovedOilAndGasPropertiesFullCostMethodTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="InclusiveNonCashAmount" id="zn_InclusiveNonCashAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="UnprovedOilAndGasPropertiesUnpaidAmount" id="zn_UnprovedOilAndGasPropertiesUnpaidAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="DebtInstrumentTextualAbstract" id="zn_DebtInstrumentTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="BondsConvertedToShares" id="zn_BondsConvertedToShares" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" />
<element name="DebtIssueMember" id="zn_DebtIssueMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ConvertibleBondsAmount" id="zn_ConvertibleBondsAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="FinancialExpenses" id="zn_FinancialExpenses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="DebtDiscountOnDerivativeLiability" id="zn_DebtDiscountOnDerivativeLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="FairValueOptionQualitativeDisclosuresTable" id="zn_FairValueOptionQualitativeDisclosuresTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" />
<element name="FairValueAssumptionRiskFreeInterestRate" id="zn_FairValueAssumptionRiskFreeInterestRate" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="FairValueAssumptionExpectedVolatilityRate" id="zn_FairValueAssumptionExpectedVolatilityRate" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="FairValueAssumptionExpectedTerm" id="zn_FairValueAssumptionExpectedTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="FairValueAssumptionsExpectedYieldRate" id="zn_FairValueAssumptionsExpectedYieldRate" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="FairValueAssumptionExercisePrice" id="zn_FairValueAssumptionExercisePrice" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" />
<element name="DerivativeLiabilityTextualAbstract" id="zn_DerivativeLiabilityTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="OperatingLeaseLiabilitiesAbstract" id="zn_OperatingLeaseLiabilitiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RightOfUseLeasesAssetsAndLeasesObligationsTextualAbstract" id="zn_RightOfUseLeasesAssetsAndLeasesObligationsTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="CommitmentsAndContingenciesTextualAbstract" id="zn_CommitmentsAndContingenciesTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="BankGuaranteesToGovernment" id="zn_BankGuaranteesToGovernment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="CashAndCashEquivalentsWeightedAverageInterestRate" id="zn_CashAndCashEquivalentsWeightedAverageInterestRate" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="TwoThousandElevenNonEmployeeDirectorsStockOptionPlanMember" id="zn_TwoThousandElevenNonEmployeeDirectorsStockOptionPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="SubsequentEventsTextualAbstract" id="zn_SubsequentEventsTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="CommonStockExercisePrice" id="zn_CommonStockExercisePrice" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="SubscriptionPrice" id="zn_SubscriptionPrice" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="BoardMembers" id="zn_BoardMembers" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="StockIssuedDescription" id="zn_StockIssuedDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="AgencyAndSetupCosts" id="zn_AgencyAndSetupCosts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
</schema>
