济阳坳陷第三系不整合油气藏运聚成藏模式

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1、学兔兔www.xuetutu.com--5天Lt+-A第29卷第6期01L＆GASGEOLOGY2008年12月文章编号：0253—9985(2008)06—0716—05济阳坳陷第三系不整合油气藏运聚成藏模式：l3宋国奇，卓勤功，孙刑中国石油化工股份有限公司胜利油田有限公司，山东东营257001；2．中国石油化工股份有限公司胜利油田有限公司地质科学研究院，山东东营257015；3武警黄金第九支队，海南海口570216)摘要：济阳坳陷第三系不整合油气藏平面上主要位于盆缘地层超剥带内的大型鼻状构造和

2、凸起的翼部，纵向上主要分布在一级不整合面附近。根据不整合面上、下地层的风化程度及其保存状况，将第三系不整合体划分为3种结构类型：I型、Ⅱ型和Ⅲ型。不同的结构类型具有不同的输导／遮挡能力。第三系不整合油气成藏的主控因素可概括为古地貌、输导体系和遮挡层。根据圈闭发育的构造位置、储层产状和油气运移的方向，建立了斜坡正向运聚和凸起侧向运聚两种不整合油气藏运聚成藏模式。两种成藏模式通常均可发育近源遮挡油气藏和远源超覆油气藏，不整合体结构中的“渗透天窗”是两类油气藏的转折点。关键词：不整合体结构；不整合油气藏

3、；成藏主控因素；成藏模式；济阳坳陷中图分类号：TEl22．3文献标识码：AHydrocarbonmigrationandaccumulationpatternsintheTertiaryunconformityreservoirsoftheJiyangdepressionSongGuoqi，ZhuoQingong，SunLi(1．SINOPECShengliOilfieldco．Ltd．，Dongying，Shandong257001，China；2．GeologicalScientifcRese

4、archInstitute，SINOPECShengliOilfieldCo．Ltd．，Dongying，Shandong257015，China)Abstract：Laterally，theTertiaryunconformityreservoirsoftheJiyangdepressionaremainlydistributedinthelargenosingstructuresofthemarginaloverlapzonesandtheflanksofsalients，whileverti

5、cally，theyoccurmainlynearthefirst—orderunconformitysurface．Threetypesofstructures，namelythetypeI，lI，andHI，areidentifiedintheTertiaryunconformitysurfaceaccordingtothedegreeofweatheringandpreservationofstratabothaboveandbelowthesurface．Differenttypesofs

6、tructuresvaryinc0nductivity／sealingability．ThemainfactorsthatcontrolhydrocarbonaccumulationintheTertiaryunconformityreservoirsarepalaeogeomorphology，conductingsystemsandbarrierbeds．Twopatternsofhydrocarbonmigrationandaccumulation，namelyforwarddirectio

7、npat‘ternonslopeandsidewaypatternonsalient．areestablishedthroughobservationofstructurallocationofuncon-fortuitytraps，occurrenceofreservoirs，andmigrationdirectionofhydrocarbons．Bothofthepatternsarefavorablefordevelopmentofproximalsealedreservoirsanddis

8、taloverlapreservoirs，withthe“conductinghatch”inun—conformitybodyactingasthetransitionbetweenthesetwokindsofreservoirs．Keywords：unconformitybody；unconformityreservoir；maincontrollingfactorforreservoiring；reservoiringpattern；JiyangDepression不整合圈