中国中西部碎屑岩领域油气富集主控因素与勘探方向

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1、学兔兔www.xuetutu.com天气肚第31卷第6期0IL&GASGE0L0GY2010年12月文章编号：0253—9985(2010)O6—0753—10中国中西部碎屑岩领域油气富集主控因素与勘探方向郑和荣，尹伟，胡宗全，伍新和，王传月4，陈新军，李松(1．中国石油化工股份有限公司石油勘探开发研究院，北京100083)摘要：在油气藏解剖的基础上，根据油气来源将中国中西部碎屑岩层系油气藏类型分为内源型、外源型和混源型，其中内源型又细分为内源自源型油气藏和内源它源型油气藏，外源型细分为外源次生油气藏和外源原生油气藏。内源自源型油气藏具有烃源岩与储集层在纵、横向

2、上就近配置的特点，易于形成大面积岩性油气藏或富集高产的构造油气藏，其油气富集主控因素为强生烃灶、凹中隆起和有利相带，是碎屑岩层系中寻找大中型油气田的首选领域；内源它源型油气藏既需要碎屑岩层系内部存在烃源岩，又需要通过纵、横向运移至上部碎屑岩层系中聚集成藏，其油气富集主控因素为强生烃灶、输导体系和(古)构造，是寻找富集高产构造油气藏的重要领域；外源型油气藏需要与下伏海相层系强生烃灶或者大型海相层系油气藏(田)在横向上邻近，还需要断层、不整合或疏导层构成的运移网络，其油气富集主控因素为输导体系有效性和下伏油藏规模，是寻找中小型次生油气藏(田)群和较大型地层油气藏的重

3、要领域。关键词：碎屑岩；生烃灶；岩性油气藏；油气富集；中国中西部中图分类号：TEl22．1文献标识码：AMaincontrollingfactorsforhydrocarbonaccumulationandpotentialexplorationtargetsinclasticsequencesinwestern-centralChinaZhengHerong，YinWei，HuZongquan，WuXinhe，WangChuangang，ChenXi~unandLiSong(1．S1NOPECExploration&ProductionResearchInst

4、itute，Beijing100083，China)Abstract：Clasticoilpoolsinwestern-centralChinamaybeclassifiedintothreemaintypesinaccordancewiththeiroil／gasorigins，namelytheinternal—sourced(hydrocarbonsbeingsourcedinsidetheelasticsequences，theexternal-sourced(hydrocarbonsbeingsourcedoutsidetheelasticsequen

5、ces)andthemixedtype(hydrocarbonsbeingsourcedbothinsideandoutsidetheclasticsequences)．Theinternal—sourcedpoolscanbesubdividedintoself-sourced(withsourcerocksoccurringwithinthereservoirinterva1)andnon—self-sourced(withsourcerocksoccurringoutsidethereservoirintervals)，whiletheexternal-s

6、ourcedtypescanbesubdividedintosecondaryandprimarypools．Theself-sourcedpoolsintheinternal—sourcedcategoryfeatureinbothve~icalandlateraladjacen-cyofsourcerockstoreservoirs，whichisfavorablefortheformationoflargelithologicalreservoirsorhighlypro—ductivestructuralreservoirs．Themajorcontro

7、llingfactorsforhydrocarbonaccumulationinthistypeofpoolsarequalityhydrocarbonkitchens，upliftswithinadepressionandfavorablefacieszones．Theyaretheprimarytargetsfordiscoveringmediumtolargereservoirs．Theformationofnon-self-sourcedreservoirsrequiresnotonlytheexistenceofsourcerockswithinthe

8、elasticseque