鄂尔多斯盆地ZR106区块长6段致密砂岩储层地质特征

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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）01-0022-10

Abstract：TheChang6memberoftheYanchangFormationintheOrdosBasinisoneofthekeyhorizonsforcontinentaltightoil developmentinChina.ThisstudyfocusesontheChang6memberintheZR106block oftheLongfangarea.Basedondata from cores，castinginsectios，aingeletroncrosopy（SE），mercuryinusionprosimetry，ndwellging，setic investigationwasconductedontheptrology，reservoirphsicalproperties，ndporestructurecharacteristicsofthetightsadstone reservoirsinthestudyarea.Onthisbasis，thetypesandcharacteristicsofdiagenesiswereanalyzedindetail，andtheirnfluence onreservoirdevelopmentandevolutionwasfurtherdiscussd.Theresultsshow thatthesandbodiesintheChang6memberof the studyareaaremainlycontroledbysandydebrisflowsandturbiditechanels.Thereservoirsareprimarilycomposedoffeldspathic sandstones，withouencesoflithicfeldspathicsandstones.Thefeldspathicsandstonescanbecategorizedintothreetypes：pure sandstones，mixedsandstones，ndtransitionalsandstones.TheChang6reservoirsinthestudyareaarecharacterizedbygenealy lowporosityandultra-lowpermeabity，forming typicaltightreservoirs.Theirporesystemsexhibitacombinationofsecondary disolution poresandresidual primaryintergranularpores，alongwiththedevelopmentofasmallnumberof microfractures.The porestructuresof thereservoirscanbeclassifedintofourdistincttypes.CompactionandcementationintheChang6reservoirshave adestructiveefect，reducingporosity，whereas dissolutionplaysaconstructiverolebyenhancingandpreservingporosityThe presenceofchloritecoatings，actingasa"protectiveshellisakeymicroscopicindicatorfordistinguishnghighqualityrseois fromtightzones.TheChang6sandstonesinthestudyareaarecurentlyattemiddlediageeticstageAndintensivedissolution is the critical factor for improving reservoir quality.

Keywords：reservoir geological characteristics；sedimentary facies；diagenesis；tight sandstone；Chang 6 member

0 引言

鄂尔多斯盆地是中国最重要的陆上含油气盆地之一，其上三叠统延长组发育的致密砂岩油藏是当前油气勘探开发的核心领域与重要接替资源。（剩余8685字）