鄂南地区中生界油气成藏体系划分与富集区预测

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1、学兔兔www.xuetutu.com专天然乞北第33卷第4期OIL&GASGEOLOGY2012年8月文章编号：0253—9985(2012)04—0591—08鄂南地区中生界油气成藏体系划分与富集区预测尹伟，郑和荣，胡宗全，刘春燕，伍新和，李松，陈纯芳，高金慧(中国石化石油勘探开发研究院，北京100083)摘要：在典型油藏解剖的基础上，根据油气成藏体系概念和划分原则，结合烃源岩、源一储组合样式、油藏特征和成藏机制等，将鄂南地区中生界划分为近源成藏体系和远源成藏体系两类。前者油藏类型以岩性油藏为主，具有“近源成藏”特征，运移距离短，运移动力主要为异常压力，隐性输导，油气富集主控因素为优

2、质烃源岩、有利储集体和构造背景，油气富集模式可概括为“近源相控”；后者油藏类型以构造、构造一岩性油藏为主，具有“远源成藏”特征，运移距离长，运移主要动力为浮力，输导体系以通源断裂为主，油气富集主控因素为通源断裂、局部构造和有利砂体，富集模式可概括为“远源断控”。近源成藏体系源储空间呈“三明治”结构，直接大面积接触，具有“近水楼台”成藏优势，生烃高峰期与关键成藏期一致，油气就近大面积充注成藏，是下一步勘探首选领域。其中，长。一长。一长近源成藏体系I类富集有利区是大中型油气田重要的勘探方向。关键词：有利富集区；近源成藏；远源成藏；油气成藏体系；中生界；鄂尔多斯盆地中图分类号：TEl22．1

3、文献标识码：AMesozoicpetroleumaccumulationsystemsandplayfairwaysinsouthernOrdosBasinYinWei，ZhengHerong，HuZongquan，LiuChunyan，WuXinhe，LiSong，ChenChunfangandGaoJinhui(SINOPECExploration&ProductionResearchInstitute，Beijing100083，China)Abstract：Accordingtotheconceptof‘‘petroleumaccumulationsystem”，incombi

4、nationwithsourcerocks，source—reservoirrelationship，reservoircharacteristicsandaccumulationmechanism，werecognizedtwoMesozoicpetroleumaccumulationsystemsinthesouthernOrdosBasin．i．e．near—sourcesystemandfar-sourcesystem．Thenear—sourceaccumulationsystemisdominatedbylithologictraps，andfeaturesinshortm

5、igrationdistance，abnor—malpressureasmajordrivingforceofmigration，andimplicitcarriersystem．Hydrocarbonaccumulationinthenear．．sourcesystemismainlycontrolledbyhigh．-qualitysourcerocksandreservoirsaswellasfavorablestructuralsetting．andthepatternofhydrocarbonaccumulationcanbedescribedas“near-sourcean

6、dfacies—control”．Thefar．sourcesystemisdominatedstructuraltrapsandstructural-lithologictraps，andischaracterizedbylongmigra—tiondistance，buoyancyasthemajordrivingforceofmigrationandsourcerock—rootedfaultscontainingthemajorcarriersystem．Hydrocarbonaccumulationinthefar．sourcesystemismainlycontrolled

7、bysourcerock—rootedfaults，localstructuresandhigh．qualitysandstonereservoirs，andthepatternofoilaccumulationcanbedescribedas“far．sourceandfault．control”．Thesourcerock—reservoirrelationshipinthenear—sourcesystemhasa“sand—wich．1