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1、摘要本文综合利用地质、地球化学、地球物理等资料,采用含油气系统研究方法,对我国东部渤海湾盆地东营凹陷第三系含油气系统进行了综合研究。在对含油气系统的成藏静态要素一烃源岩、储层、盖层、输导层等描述的基础上,着重对成藏动态过程一油气生成和排出、油气运聚、圈闭的形成进行了研究。利用烃源岩主要生排烃史、油藏饱和压力、流体包裹体等综合研究方法,将东营凹陷确定为两期成藏:古近纪东营期和新近纪馆陶末一明化镇时期,以晚期成藏为主。通过全区精细油源对比,阐明了成熟烃源岩与油气聚集的成因关系,明确了该区沙四上、沙三段
2、两套有效烃源岩及其相关的三种类型原油:将t凹陷划分为两大含油气系统:沙四上一沙四上、沙二段,含油气系统,沙三一沙二段、沙三段,含油气系统,它们构成东营凹陷复合含油气系统。以生油洼陷为中心划分为四个复合亚含油气系统。根据油气成藏系统的概念及划分原则,将东营凹陷划分为8个成藏系统。研究认为,利津亚系统是东营凹陷油气最富集的亚系统,中央隆起带是油气聚集条件最好的成藏系统。系统总结了东营凹陷5种成藏模式,分析了油气的宏观分布规律,指出中央隆起带型和陡坡带型成藏模式是凹陷内主要油气聚集形式。[关键词]:油气
3、系统;油气聚集;圈闭24ABSTRTCTGeological,geochemical,geophysicaldata,comprehensiveutilizationofthispaper,theresearchmethodofpetroleumsystem,makesacomprehensivestudyofthirdseriespetroleumsysteminDongyingdepressionofBohaiBayBasinineasternchina.Thepetroleumsystemo
4、freservoirstaticelementsofahydrocarbonsourcerock,reservoir,caplayer,transportlayer,basedonthedescriptionofthereservoir,adynamicprocessofoilandgasgenerationandexpulsion,migrationandaccumulationofoilandgas,theformationoftrapsarestudied.Themainsourcerock
5、ofhydrocarbongeneration,reservoirsaturationpressure,acomprehensivestudyoffluidinclusionsandothermethods,theDongyingdepressionisdeterminedas:tworeservoirsofPaleogeneinDongyingperiodandNeogeneGuantaolastMinghuazhenperiod,thelateaccumulation.Throughthefi
6、neoilsourcethecontrast,thegeneticrelationshipbetweenrockandoilandgasaccumulationinmaturehydrocarbonsource,theDistrictShaShathreesectionfour,twosetsofeffectivehydrocarbonsourcerocksandthreetypesofcrudeoilinDongyingsagcanbedividedinto:twopetroleumsystem
7、s:asandsandfourfoursand,twopetroleumsystem,ShaShatwosectionthreeone,sandthreepetroleumsystem,theyconstitutethecompositepetroleumsysteminDongyingdepression.Inordertosagasthecenterisdividedintofourcompositepetroleumsubsystem.Accordingtooilandgasintothec
8、onceptandprincipleofdividingthereservoirsystem,Dongyingsagcanbedividedinto8reservoirsystem.Researchthinks,LijinsubsystemistheenrichmentofoilandgasinDongyingdepression,centralupliftbeltishiddensystemforoilandgasaccumulationconditionsintothebest