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川西坳陷侏罗系沙溪庙组碎屑岩储层成岩作用研究.docx

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川西坳陷侏罗系沙溪庙组碎屑岩储层成岩作用研究 Abstract TheSandixiaomiaoFormationintheChuanxiTroughisaJurassicclasticrockreservoir.ThediagenesisprocessoftheSandixiaomiaoFormationwasanalyzedbasedonoutcropcharacteristics,opticalmicroscopeobservations,analysisofthinsections,fluidinclusionmeasurements,andX-raydiffractionanalysis.ThestudyfoundthatthediageneticprocessesoftheSandixiaomiaoFormationincludedcompaction,cementation,dissolution,andauthigenicmineralformation.ThisstudyaimedtoanalyzethediageneticprocessoftheSandixiaomiaoFormationandtoprovideascientificbasisfortheexplorationanddevelopmentofoilandgasresourcesinthisarea. Introduction TheChuanxiTroughisoneoftheimportantpetroleumexplorationareasinChina.TheJurassicSandixiaomiaoFormationintheChuanxiTroughisknownforitshigh-qualityclasticrockreservoirs.Thediageneticprocessisoneofthemostcriticalfactorsaffectingthephysicalandchemicalpropertiesofreservoirrocks.Therefore,itisessentialtostudythediageneticprocessoftheSandixiaomiaoFormation.Inthisstudy,basedonfieldoutcropcharacteristics,opticalmicroscopeobservations,analysisofthinsections,fluidinclusionmeasurements,andX-raydiffractionanalysis,thediageneticprocessoftheSandixiaomiaoFormationwasanalyzed,andthedominatingfactorscontrollingitsdiageneticprocesswerediscussed. Geologicalsetting TheChuanxiTroughislocatedinthesoutheasternmarginoftheTibetanPlateauandiscomposedofCenozoicandMesozoicstrata.TheMesozoicstrataincludeLowerJurassicLeikoupoGroup,UpperJurassicPenglaizhenGroup,andLowerCretaceousLongwangmiaoFormation.Amongthem,thePenglaizhenGroupiscomposedoftheshallow-marinefaciesinthewesternpartoftheChuanxiTroughandthebraidedriverdeltafaciesintheeasternpartoftheChuanxiTrough.TheSandixiaomiaoFormationinthePenglaizhenGroupismainlydistributedintheeasternpartoftheChuanxiTrough.TheSandixiaomiaoFormationhasathicknessof200mto400mandismainlycomposedofsandstone,siltstone,andmudstone.ThereservoirqualityoftheSandixiaomiaoFormationisverygood,anditisanessentialtargetforoilandgasexplorationintheChuanxiTrough. Methodology Th