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ID:36741799
大小:1.99 MB
页数:8页
时间:2019-05-14
《巴西坎普斯盆地油气地质特征与隐蔽油气藏》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、学兔兔www.xuetutu.com--5天然乞此第33卷第5期OIL&GASGEOLOGY2012年10月文章编号:0253—9985(2012)05—0705—08巴西坎普斯盆地油气地质特征与隐蔽油气藏张申,郭莉,林卫东(中国中化石油勘探开发有限公司,北京100031)摘要:近年来,巴西海上已成为中外油公司投资和关注的热点地区。为降低地质风险,根据物探和钻井资料,系统分析了巴西坎普斯盆地的烃源岩、储集层、盖层及圈闭等基本石油地质条件,剖析了盆地已发现的4类典型隐蔽油气藏。在此基础上,提出了隐蔽油气藏在盆地油气勘探中的巨大潜力。研究表明,坎普斯
2、盆地自早白垩世形成以来,经历了裂谷期、漂移早期和漂移后期3个发展阶段,沉积了非海相、过渡相和海相三大巨层序。坎普斯盆地从下白垩统到新近系具备3套可能的烃源岩,但最重要的烃源岩是早白垩世的LagoaFeia组烃源岩,目前盆地中发现的所有油气都是来自该套烃源岩。坎普斯盆地从下白垩统到中新统都发现了油气藏,有多种类型的储层,包括裂缝玄武岩储层、LagoaFeia组生物碎屑灰岩储层、Maca6组灰岩、砂岩储层和上白垩统一渐新统海相浊积砂岩储层。隐蔽油气藏在盆地中占据重要地位,主要类型是地层油气藏,包括地层超覆油气藏、潜山油气藏和不整合遮挡油气藏。要继续加
3、强对隐蔽油气藏的勘探,特别要重视岩性油气藏和裂缝油气藏的勘探。关键词:隐蔽油气藏;勘探潜力;油气地质;坎普斯盆地;巴西中图分类号:TEl21文献标识码:APetroleumgeologyandsubtletrapsinCamposBasin,BraziloffshoreZhangShen,GuoLiandLinWeidong(SinochemPetroleumExplorationandProductionLtd.,Beijing100031,China)Abstract:Inrecentyears,Braziloffshorehasbecome
4、oneofthehotareasatractinginternationalinvestments.Inordertolowerexplorationrisk,westudiedthebasicelementsoftotalpetroleumsysteminCamposBasin,inclu-dingsoHreerocks,reservoirrocks,trapsandsealsbyintegratinggeophysicalprospectingandwelldata,analyzedfourkindsoftypicalsubtletrapsd
5、iscoveredinthisbasin,andproposedthatsubtletrapshavelargeexplorationpotentialsinthisbasin.SincetheformationofthebasinintheEarlyCretaceous,ithasexperiencedthreeevolu-tionstages,includingtifing,earlydriftingandlatedriftingstages,anddevelopedthreemegasequencesofnon-marine,transit
6、ionalandmarinefaciesrespectively.ThreesetsofsourcerockspossiblyoccurinthestratafromtheLowerCretaceoustotheNeogeneinCamposBasinandthemostimportantsourcerocksistheLowerCreta-ceousLagoaFeiaFormation,fromwhichallthediscoveredoil/gasinthebasinweresourced.Variousoil/gasreservoirsha
7、vebeendiscoveredinalltheformationsfromtheLowerCretaceoustotheMiocene,includingfrac-turedbasaltinthebasement,bioclasticsintheLagoaFeiaFormation,carbonatesintheMaca6Formation,clasticreservoirsandmarineturbiditesintheUpperCretaceous-Oligocene.Subtletrapsareveryimportantintheba-s
8、inandaredominatedbystratigraphictrapsincludingoverlaptraps,buried—hi
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