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1、输导体系与油气成藏关系研究—以准噶尔盆地北三台地区为例田辉1,查明2,肖贤明1,曲江秀2(1.中科院广州地球化学研究所有机地球化学国家重点实验室,广东广州510640;2.石油大学(华东)资源系,山东东营257061)摘要:输导体系是决定油气成藏规律的重要因素之一。在深入研究准噶尔盆地北三台地区输导体系的基础上,从输导体系的内涵出发,将其分为“通源”与“通圈闭”两个亚体系,并探讨了二者在油气成藏中的不同作用。以“通源”亚体系为标准,将输导体系划分为断裂、不整合及连通砂体三种基本类型,不同类型的输导体系有着不同的运聚模式与主
2、控因素,不同类型输导体系的时空配置是复式成藏系统形成的重要原因之一。研究表明,北三台南部地区在燕山Ⅰ幕运动前后有断裂—连通砂体与不整合—连通砂体两种输导体系,前者多发育断裂—岩性油气藏,后者则以地层—岩性油气藏为主;在燕山Ⅱ幕运动前后以断裂—断裂+砂体+不整合面输导体系为主,相应发育了断裂控制的各种原生与次生油气藏。西南斜坡以不整合—断裂输导体系为主,地层及断裂—地层油气藏发育。关键词:输导体系;油气成藏;地球化学;准噶尔盆地Therelationshipbetweenmigrationsystemandhydrocarb
3、onaccumulation:AcasestudyintheregionofBeisantai,JunggarbasinTIANHui1,CHAMing2,XIAOXian-ming1,QUJiang-xiu2(1.StateKeyLaboratoryofOrganicGeochemistry,GuangzhouInstituteofGeochemistry,ChineseAcademyofScience,Guangzhou,China,510640;2.UniversityofPetroleum(EastChina),D
4、ongying,China,257061)Abstract:Themigrationsystemisoneofthemostimportantfactorscontrollinghydrocarbonaccumulation.Intrinsically,themigrationsystemcanbesubdividedintotwosubsystems,oneofwhichlinkssourcerockswithreservoirsandtheotherchannelshydrocarbonintotrapsandeach
5、ofthemplaysadifferentroleonoilaccumulation.Accordingtothesource-linkingsubsystem,therearethreetypesofmigrationsystem:fault,unconformityandconnectedsand-bodysystemsandeachofthemhasadistinctmechanismofcontrollinghydrocarbonaccumulationandthecombinationofdifferentsys
6、temexplainsthecompoundhydrocarbonsystem.ThemigrationsystemsinBeisantaiarequitecomplicatedandhavedifferentstylesindifferentareaandtime.Inthesouthernregion,therearefault—connectedsandbodyandunconformity—connectedsandbodymigrationsystem,whichcontrolledthefault&lithol
7、ogicandstratigraphic&lithologicoilpools,respectively,duringepisodeⅠofYanshanMovementandthefault—sandbody+unconformity+faultmigrationsystemwithfault-associatedsecondarypoolsduringepisodeⅡofYanShanMovement.Thesouthwestslopeisdominatedbyunconformity—faultsystemandstr
8、atigraphicandstratigraphic&faultoilpoolsarewelldeveloped.Keywords:migrationsystem;hydrocarbonaccumulation;geochemistry;Junggarbasin油气的运移作用是连接油源与圈闭的纽带[1-