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鄂尔多斯盆地坪庄-上里塬地区长8储层成岩作用研究.docx

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鄂尔多斯盆地坪庄-上里塬地区长8储层成岩作用研究 Abstract InthePingzhuang-ShangliyuanareaoftheOrdosBasin,whichisanimportantoilandgasexplorationareainChina,thereareabundantoilandgasresourcesintheChang8reservoir.However,thecomprehensivestudyofdiageneticcharacteristicsandevolutionofChang8reservoirinthisareaisstillinsufficientlyunderstood.Basedontheanalysisofgeologicaldataandlaboratoryexperiments,thispapersystematicallysummarizesthelithology,sedimentarycharacteristics,diagenesisandevolutionhistoryoftheChang8reservoirinthestudyarea. IthasbeenfoundthattheChang8reservoirinthestudyareaismainlycomposedoffine-grainedsandstoneandargillaceoussandstone,withasmallamountofmudstoneandsiltstone.Thesedimentaryrockischaracterizedbysmallparticlesize,goodsorting,andlowpermeability.ThediageneticprocessoftheChang8reservoirinthestudyareaismainlycharacterizedbycompaction,cementation,dissolutionandreplacement.Amongthem,compactionisthemaindiageneticprocess,whichhasasignificantimpactonthereservoirquality.Theeffectsofcementation,dissolutionandreplacementonreservoirqualityarerelativelysmall. ThroughthestudyoftheburialhistoryandthermalevolutionhistoryoftheChang8reservoir,itcanbefoundthatthemaindiageneticprocessoftheChang8reservoirinthestudyareaoccurredintheearlydiageneticstagebecauseoftectonicactivities,sedimentationanddiageneticfluidactivity.Therefore,thereservoirqualityisaffectedbytheearlydiageneticstage. Insummary,thestudyofthediageneticcharacteristicsandevolutionoftheChang8reservoirinthePingzhuang-ShangliyuanareaoftheOrdosBasinprovidesascientificbasisfortheexplorationanddevelopmentofoilandgasresourcesinthisarea. Keywords:OrdosBasin;Pingzhuang-Shangliyuanarea;Chang8reservoir;diageneticprocess;evolution Introduction ThePingzhuang-ShangliyuanareaoftheOrdosBasinisoneofthemostimportantoilandgasexplorationareasinChina.TheexplorationanddevelopmentofoilandgasresourcesinthisareahavegreatpracticalsignificancetoChina'senergysecurityandeconomicdevelopment.TheChang8reservoiriswidelydistributedinthestudyareaandisanimportantreserv