济阳坳陷八面河地区古近系孔店组油气成藏特征

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1、学兔兔www.xuetutu.com沽天然乞肚第32卷第3期OIL&GASGEOLOGY文章编号：0253—9985(2011)03—0352—08济阳坳陷八面河地区古近系孔店组油气成藏特征徐义卫(中国石化江汉油田分公司，湖北潜江433124)摘要：济阳坳陷八面河地区古近系孔店组具有形成油气藏所需的储层、圈闭和保存条件，但缺少生烃条件。八面河孔店组油藏具有“低密度、低粘度、低含硫、高含蜡、高凝固点”的特点，与东营凹陷王家岗孔店组原油具有相似性。对比八面河地区孔店组与沙河街组的原油性质、组分构成及生物标志化合物等地化指标，认为来自东营凹陷沙河街组四段

2、下亚段和孔店组二段的原油通过不整合面沿由北西向古构造脊与河道砂体构成的优势通道运移至八面河地区，形成以超覆不整合地层油藏和构造油藏为主体的多种油藏类型。受构造背景、油气输导、储层展布、圈闭分布及断层活动等多种因素控制，孔店组油气平面上主要分布在八面河鼻状构造带西南端，纵向上多聚集在距不整合面80In以内的孔店组下部，其油藏具有充满程度低、规模较小的特点。关键词：油气输导；油气聚集；油藏类型与分布；孔店组；古近系；八面河地区；济阳坳陷中图分类号：TEl22．3文献标识码：ACharacteristicsofhydrocarbonaccumulatio

3、ninthePaleogeneKongdianFormationofBamianhearea，theJiyangDepressionXuYiwei(SINOPECJianghanOilfieldCompany，Qianjiang，Hubei433124，China)Abstract：TheKongdianFormationintheBamianheareahasnecessaryconditionsforoi】andgasaccumulation．suchasreservoirs，trapsandsealingconditions，butitlac

4、kshydrocarbongenerationconditions．OilintheKongdianFormationoftheBamianheareaischaracterizedbylOWdensity，lOWviscosity，lOWsulfatecontent．highwaxcontentandhighfreezingpointandcancorrelatewiththatintheKongdianFormationoftheWangjiagangareaintheDongyingdepression．Accordingtothecontr

5、astofgeochemicalindicators，suchasthenatureofcrudeoil，thecon—stitutionofcomponentandthebiomarkerbetweentheKongdianFormationandShah@eFormationoftheBamian—hearea，webelievethatcrudeoi1sourcedfromthelower4memberofShahejieFormation(Es)andthe2“‘。memberoftheKongdianFormation(Ek)oftheD

6、ongyingdepressionmigratedtotheBamianheareaalonguncon—formitiesandfavorablepassagewayswhichconsistedoftheNorth—westpalaeostrueturecrestandehannelsandbody．Therefore，avarietyofreservoirtypeswereformedwiththemajorityofoverlappingunconformitystratigraphicreservoirsandstructuralrese

7、rvoirs．Controlledbystructuralsetting，carriersystem，reservoirdistribution．trapdistributionandfaultactivities．oil／gasintheKongdianFormationaremainlydistributedinthesouthwesternpartofthenosestructurezonehorizontallyandinthelowerpartoftheKongdianFormationverticallywhicharewithin80

8、mofdistancefromtheunconformity．Theseoilpoolsarefeaturedbyinsu