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北部湾盆地乌石凹陷东区流三段物源分析及其对储层物性的控制.docx

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北部湾盆地乌石凹陷东区流三段物源分析及其对储层物性的控制 Abstract TheUshiSagisanimportantpetroleumexplorationareaintheBeibuGulfBasin.However,thephysicalcharacteristicsofthereservoirsarepoorlyunderstood.Inthisstudy,weanalyzedthesedimentaryfaciesandprovenancesoftheLowerTriassicstrataintheeasternUshiSagusingwellloggingdataandcoresamples.Theresultsshowedthatthemainsedimentaryfaciesareconglomerates,redsandstones,siltstones,andmudstones.Basedonthepetrographicanalysis,itwasfoundthatthesandstonesaremostlylithicsandstoneswithaminoramountofquartzsandstones.Intermsofprovenance,thesedimentaryrocksintheUshiSagaremainlyderivedfromtheQinling-DabieOrogenicBeltandtheYangtzeBlock.Thephysicalpropertiesofthereservoirsarecloselyrelatedtosedimentaryfaciesandprovenances.Theconglomeratesandsandstoneshavebetterporosityandpermeabilitythanthemudstonesandsiltstones.Therefore,theUshiSaghasgoodpotentialforhydrocarbonexplorationanddevelopment. Introduction TheBeibuGulfBasinisaMesozoic-CenozoicsedimentarybasinlocatedinthesouthwesternpartofChina.Thebasiniscomposedofaseriesofsub-basins,includingtheQiongdongnanBasin,theQiongzhongnanBasin,andtheBeibuGulfBasin.TheBeibuGulfBasinisfurtherdividedintoseveraldepressions,includingtheUshiSag,theLeidongSag,andtheLingshuiSag.TheUshiSagislocatedintheeasternpartoftheBeibuGulfBasin,coveringanareaofapproximately890km2(Figure1).ThesedimentaryrocksintheUshiSagaremainlycomposedofPermian-Triassicstrata,whicharepotentialhydrocarbonsourceandreservoirrocks.However,thephysicalcharacteristicsofthereservoirsarepoorlyunderstood. TheLowerTriassicstrataintheUshiSagarethemainexplorationtargetsforpetroleumgeologists.TheLowerTriassicstrataintheeasternpartoftheUshiSagaremainlycomposedofconglomerates,sandstones,siltstones,andmudstones.TheprovenanceoftheLowerTriassicstrataintheUshiSagiscomplex,whichmakesitdifficulttoaccuratelyassessthepotentialhydrocarbonresources.Inthisstudy,weconductedadetailedanalysisofthesedimentaryfaciesandprovenancesoftheLowerTriassicstrataintheeasternUshiSag,withtheaimofprovidinginsights