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琼东南盆地西南部古近系层序地层及沉积体系研究.docx

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琼东南盆地西南部古近系层序地层及沉积体系研究 Abstract: ThestudyofsequencestratigraphyandsedimentarysystemsoftheUpperJurassicinthesouthwesternpartofQiongdongnanBasinprovidesaninsightintothemechanismsthatcontrolledthedepositionofthesedimentarysystemsinthebasin.Inthisresearch,wecarriedouttheassessmentofthedepositionalenvironments,thestratigraphy,andthesedimentarysystemsoftheUpperJurassicusingvariousgeologicalmethodssuchascoreanalysis,wellloginterpretation,andoutcropanalysis.TheresultsrevealedthattheUpperJurassicsequenceinQiongdongnanBasinwascharacterizedbyfourhigh-frequencysequences(HFSs),whichcontrolledthedepositionofdifferentsedimentarysystems.ThefirstthreeHFSsshowedcharacteristicsoftransgressivesystemstract,whilethefourthHFSdisplayedaregressivesystemtract.ThesedimentarysystemsoftheUpperJurassicinthisregionweremainlyrepresentedbyshallowmarinecarbonateplatform,tidalflat,anddeltaicdepositionalsystems.Thesesedimentarysystemsdisplayeddistinctarchitecturalelements,faciesassociations,anddepositionalenvironments,whichwereinfluencedbyvariationsinshelfgeometry,sedimentsupply,andsealevelchangesduringtheUpperJurassic. Keywords:QiongdongnanBasin,UpperJurassic,Sequencestratigraphy,Sedimentarysystems,Transgressivesystemstract,Regressivesystemtract. Introduction: QiongdongnanBasinislocatedinthesoutheasternpartofHainanIsland,anditisanimportantoilandgasbasininChina.Thebasinhasacomplexgeologicalhistory,anditwasinfluencedbyvarioustectoniceventssuchastheIndosinianorogeny,Yanshanianorogeny,andHimalayanorogeny.TheUpperJurassicsequenceinQiongdongnanBasinisakeyhydrocarbonreservoirinthebasin,andithasattractedconsiderableattentionfromresearchersduetoitssignificantpetroleumpotential. Inthisstudy,wecarriedoutanexaminationofthesequencestratigraphyandsedimentarysystemsoftheUpperJurassicinthesouthwesternpartofQiongdongnanBasin.Theaimwastoprovideadetailedunderstandingofthedepositionalmechanismsthatcontrolledthesedimentarysystemsinthebasin. MaterialsandMethods: Wegathereddatafromvarioussources,includingcoreanalysis,welll