鄂尔多斯盆地东部马家沟组三段盐下天然气有效储层发育 主控因素研究

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中图分类号：P618.13；TE122 文献标识码：A 文章编号：2097-5465（2026）02-0028-11

Abstract：Withtheadvancementofdeepoilandgasexploration，multipleexplorationwelsintheMa3sectionoftheOrdovician MajiagouFormation（hereinafterreferedtoasMa3section）beneath thesaltsequenceintheeastemOrdosBasinhaveyielded commercial gasflowsduringtesting，demonstrating promisingexplorationpotential.However，thecomplexdevelopmentmechanisms andrelativelylimitedresearchonefectivereservoirsinthisintervalhaveconstrainedexplorationanddevelopmentprogess. Therefore，basedondata from dilling cores，thinsections，3Dseismic，anddrilingandlogging，asystematicanalysis was conductedtoidentifthetys，hracteristics，andcontrolingfactorsoffetiveresevoirsintheMa3section，nasevir development modelwasestablished.Theresultsindicate thatsulfatelagoonandgypsum-bearingdolomiteflatfaciesprovide the materialbasisformoldicporeresevoirs，whicharetransformedintohigh-qualitystoragespacesthroughdisolution.Dolomiteflat faciesdevelopintercystallne（disolved）poreresevoirsiadolomitizationandbrialdisslutionShoalodiesfonteraulardisolvedporereservoirsthroughthedissolutionofprimaryintergranularpores.Multi-phasetectonicfaultscontrolthedevelopment offracturesandfault-karstbodies，significantlyenhancingreservoironnectivityConsequently，compositeareascharacterizedby shoalbodies，dolomiteflats，andgypsum-bearingdolomiteflatfacies，whichhaveundergoneintensedisolutionandmulti-phase fault modification，represent key targets for future exploration.

Keywords：OrdosBasin；the thirdsectionof theMajiagouFormation；effctivereservoirtype；maincontrollingfactor

鄂尔多斯盆地东部奥陶系盐下天然气藏是我国碳酸盐岩油气藏勘探的重要领域。（剩余12758字）