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东营凹陷北带东段古近系砂砾岩扇体储层特征与油气成藏.docx

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东营凹陷北带东段古近系砂砾岩扇体储层特征与油气成藏 Abstract: ThestudyofthecharacteristicsofthereservoirandoilandgasaccumulationintheDongyingDepressionNorthBeltEastSection,GujinsiSandGravelFanBody,isofgreatsignificancefortheexplorationanddevelopmentofoilandgasresourcesinthisarea.Thispaperanalyzesthelithology,sedimentarycharacteristics,reservoirproperties,andoilandgasaccumulationmechanismsoftheGujinsiSandGravelFanBodyinthestudyarea.TheresultsshowthattheGujinsiSandGravelFanBodyhasgoodsedimentaryproperties,richsourceandcaprocks,goodmigrationchannels,andhigh-qualityreservoirs.Themainaccumulationmechanismisstratigraphicaccumulation,supplementedbystructuralandlithologictraps.TheexplorationanddevelopmentoftheGujinsiSandGravelFanBodyinthestudyareahavegreatpotentialandvalue. Introduction: TheDongyingDepressionislocatedintheeasternpartoftheBohaiBayBasin,whichisoneofthelargestoilandgasproducingareasinChina.TheGujinsiSandGravelFanBodyisoneofthemostimportantreservoirtypesintheDongyingDepression.ItiswidelydistributedinthenorthbeltoftheDongyingDepression.TheGujinsiSandGravelFanBodyinthestudyareaislocatedintheeastsectionofthenorthbeltoftheDongyingDepression.Thestudyofitscharacteristicsandoilandgasaccumulationisofgreatsignificancefortheexplorationanddevelopmentofoilandgasresourcesinthisarea. GeologicalSetting: TheGujinsiSandGravelFanBodyinthestudyareaismainlycomposedofTriassicandJurassicstrata,whicharedividedintofourlayersfrombottomtotop:theBaxianGroup,theZhongyuanGroup,theFangchengGroup,andtheKongdianFormation.TheBaxianGroupiscomposedoftheLowerTriassicsandstoneandmudstone,whichisthemainsourcerockinthestudyarea.TheZhongyuanGroupismainlycomposedofMiddle-LateTriassicsandstoneandmudstonesystem,whichisthereservoirrockinthestudyarea.TheFangchengGroupismainlycomposedofJurassicshallowwatercarbonaterock,whichformsthecaprockinthestudyarea.TheKongdianFormationismainlycomposedofCretaceousmudstoneandsandstone,whichisthesealrockinthestudyarea. SedimentaryCharacteristics: TheGujinsiSandGravelFanBodyinthestudyareaisatypica