11427.鄂爾多斯盆地西南部上古生界天然氣成藏地球化學(xué)特征研究

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3、fgasgeochemicalcharacteristicsofaccumulationintheUpperPaleozoicofSlouthwestOrdosBasinSpecialty：Mineralogy、Name：HuWeiqiang(Instructor：ZhaoJingzhTheSouthwestOrdosBasinislowporositylowpermeabilitylithologicgasreservoirandit

4、smaingasreservoirsarePermianHe8ofShiheziformationandShanlofshanxiformationBasedonthepreviousresearchresultsandtheexitingexplorationdatausingboththepetroleumsystemtheoryandpoolformingdynamic，guidedbythetheoryandmethodofPe

5、troleumGeologySedimentaryPetrologyHydrocarbonAccumulationGeologyandOil&GasGeochemistrythisarticledetailedstudiesthegasgeochemicalcharacteristics，thenaturalgasorigin，thegassourcerockcharacteristicsandthegasaccumulationper

6、iodThemainconclusionsandinnovativeachievementsthatobtainedbythisarticleareasfollows：IntheSouthwestOrdosBasin，theupperpalaeozoicgasofthisareaismainlycoalgasgeneratedhydrocarbonsourcerocks，andasmallamountofoiltypegasmixesi

7、nThedarkmudstoneasawholepresentsatrendofgraduallybecomingthinnerfromnorthtosouthTheorganicmatterofsourcerockinrelativelyhighabundance，kerogenbelongstotypeIIIAndthethermalevolutionisduringthehighmature—postmaturephasesThe

8、averageoftheintensityofgasgenerationis155108m3／km2ItpresentsatrendofgraduallybecomingsmallerfromnorthtosouthAndtheformationanddistributionoftheupperpalaeozoicgasreservoiriscontrolledobviouslybygassourceconditionTheresear

9、chofupperpalaeozoicnaturalgasintheSouthwestOrdosBasinshowsthattheaverageofCH4is8860％，theaverageofariditycoefficientis9841％The513C1ofgasismainlydistributedin26％0一32％0The6“C2ismainlydistributedin26％033％0The52D1ismainlydist

10、ributedin160％o一190％oThe62DEismainlydistributedin140％o180％oThegasmaturitylevelisbetween12％18％，andisinthestageofmaturetohighmatureThemaindrivingforceforgasmigrationofBenxiformation，Shan2intheSouthwestOrdosBasinisabnormalpr

11、essureformedbyhydrocarbongenerationThemaindrivingforceforgasmigrationofShanlandHe8ismoleculardiffusionreactionforce，andtheupperpalaeozoicgashasthecharacteristicsofproximaldepositmigrationaccumulationTheanalysisoftheupper

12、palaeozoicinclusionandsourcerocksimulationshowsthatatlateTriassic，theupperpalaeozoichydrocarbonsourcerockentershydrocarbongenerationthresholdItisinlowmaturestage，andbeginstoproducehydrocarbonBasicallynogasdischargeAtearl