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  <element id="tgc_DeferredTaxAssetsOilAndGasProperties" name="DeferredTaxAssetsOilAndGasProperties" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
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  <element id="tgc_AssetRetirementObligationLiabilitiesOnPropertiesSold" name="AssetRetirementObligationLiabilitiesOnPropertiesSold" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="tgc_TaxCutsAndJobsActOf2017ChangeInTaxRateIncomeTaxExpenseBenefit" name="TaxCutsAndJobsActOf2017ChangeInTaxRateIncomeTaxExpenseBenefit" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="tgc_TaxCutsAndJobsActIncompleteAccountingChangeInTaxRateIncreaseDecreaseInDeferredTaxAssetProvisionalIncomeTaxExpense" name="TaxCutsAndJobsActIncompleteAccountingChangeInTaxRateIncreaseDecreaseInDeferredTaxAssetProvisionalIncomeTaxExpense" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
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</schema>
