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ID:37329163
大小:1.55 MB
页数:6页
时间:2019-05-21
《南大西洋含盐盆地油气富集规律及勘探潜力》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、第36卷第1期新疆石油地质Vo1.36.No.12015年2月XINJIANGPETROLEUMGE0L0GYFeb.2015文章编号:1001—3873(2015)O1—0121~06DOI:10.7657/XJPG20150125南大西洋含盐盆地油气富集规律及勘探潜力邬长武(中国石化勘探开发研究院,北京100083)摘要:南大西洋含盐盆地油气资源丰富,各盆地具有相同的构造演化历史和相似的地层发育特征,但油气分布极不均衡。研究了这些盆地构造演化、地层、油气成藏条件及油气分布特征后指出,南大西洋盆地经历了裂谷、过渡和被动大
2、陆边缘3个演化阶段,发育盐下、盐岩和盐上3套层序,盐下、盐上2套烃源岩,盐下、盐上碳酸盐岩和盐上碎屑岩3套储集层,形成3套成藏组合。盐上成藏组合油气富集主要取决于盐上浊积砂岩储集层的发育程度和盐上烃源岩的成熟度,在下刚果一刚果扇盆地最为富集;盐下一盐上成藏组合油气富集主要取决于油气运移通道、盐上储集层的发育程度,在坎波斯盆地最为富集;盐下成藏组合油气富集主要取决于裂谷盆地规模、基底隆起和盐岩盖层,在桑托斯盆地最为富集。宽扎盆地的盐下层系、桑托斯盆地和坎波斯盆地的外部高地带和中部低凸带盐下碳酸盐岩、各盐盆伸展区盐上碳酸盐岩层
3、系是极具勘探潜力的新领域。关键词:南大西洋;含盐盆地;构造演化;地层特征;成藏特征;富集条件;勘探潜力中图分类号:TEl11.1文献标识码:AHydrocarbonEnrichmentCharacteristicsandExplorationPotentialsinSaltBasinsofSouthAtlanticWUChangwu(ResearchInstituteofPetroleumExplorationandDevelopment,Sinopec,Beijing100083,China)Abstract:Thesa
4、ltbasinsintheSouthAtlanticarecharacterizedbyrichhydrocarbonresources,sametectonicevolutionhistoryandsimi—laystratigraphicfeaturesaswellasveryunevendistributionofoilandgas.Thispapersuggestedfromstudiesofthetectonicevolutions,stra·ta,hydrocarbonaccumulationcondition
5、sandpetroleumdistributioncharacteristicsthatthesebasinshadexperiencedthreeevolutionstagesoftifing,transitionandpassivecontinentalmargin,withcorrespondingdevelopmentofpre·salt,saltandpost—saltsequences.Andthepre-saltandpost—saltsourcerocks,pre—saltandpost-saltcarbo
6、naterocksandpost—saltclasticrocksasreservoirrocksformedthreesetsofhy-drocarbonaccumulationcombinations.Thedevelopmentofpost—saltturbiditesandreservoirandthematurityofpost—saltsourcerockscon—trolledthehydrocarbonenrichmentofthepost—saltcombination,whichisfoundinLow
7、erCongo—CongoFanbasin;theoil—gasmigrationchannelsandthedevelopmentofpost—saltreservoirrockscontrolledthehydrocarbonenrichmentofthepre—salttopost—saltcombination,whichappearsinCamposbasin;andtheriftbasinscale,basementupliftandsaltcaprockcontrolledthepre—saltcombina
8、tion,whichOC—cursinSantosbasin.Hence,theKwanzabasin’Spre—saltsequence,theSantosbasin’SandtheCamposbasin’Spre—saltcarbonaterocksintheiroutsidehi【gh-swell
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