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1、珠江口盆地文昌B凹陷及周边油气成藏特征与有利勘探领域第33卷第3期2011年6月石油察诒沾属PETR0LEUMGE0LoGY&EXPERIMENTVoI.33.No.3Jun.,2011文章编号:1001—6112I2011)03—0297—06珠江口盆地文昌B凹陷及周边油气成藏特征与有利勘探领域张迎朝,陈志宏,李绪深.,徐新德,李琦.(1.中国地质大学资源学院,武汉430074;2.中国海洋石油总公司湛江分公司研究院,广东湛江524057;3.中国地质大学,北京10O083)摘要:利用烃源岩分析,油一源对比和成藏综合分析等技术,研究了文昌B凹陷及周边
2、的油气来源和成藏历程,阐明了不同区带的主力烃源岩与油气成藏特征,深化了油气成藏主控因素认识,提出了有利油气勘探方向.研究认为,文昌B凹陷文昌组浅湖相烃源岩是凸起区成藏的主要贡献者,是该区除众所周知的中深湖相优质烃源岩外的另一种优质烃源岩.南断裂带下降盘文昌组湖相烃源岩沉积期末经历了构造反转抬升,具有"延迟生排油,多期持续油充注"的成藏过程,三号断裂带下降盘具有"早期生排油,多期油气充注"的成藏过程.良好的文昌组湖相烃源岩,多幕式断裂活动,多套区域性优质储盖组合是该区复式油气成藏的主控因素.提出文昌B凹陷反转陡坡带,北斜坡中深层古近系,琼海凸起珠江组一段上部是有
3、利油气勘探方向.关键词:浅湖相烃源岩;成藏过程;成藏主控因素;勘探方向;文昌B凹陷及周边;珠江口盆地中图分类号:TE122.3文献标识码:APetroleumaccumulationcharacteristicsandfavorableexplorationdirectionsinWenchangBSaganditssur-roundingareas,PearlRiverMouthBasinZhangYingzhao,ChenZhihong,LiXushen,XuXinde,LiQi.(1.ChinaUniversityofGeosciences,Wuhan,
4、Hubei430074,China;2.ResearchInstituteofZhangJiangBranchCompany,CNOOC,Zhanjiang,Guangdong524057,China;3.ChinaUniversityofGeosciences,Beijing100083,China)Abstract:Basedonsourcerockanalysis,oil——sourcecorrelationandaccumulationcomprehensiveanaly—sis,oi1sourceandaccumulationprocessinthe
5、WenchangBSaganditssurroundingareaswerestudied.Mainsourcerockandhydrocarbonaccumulationfeaturesindifferentregionswereillustrated.Maincon—trollingfactorsofhydrocarbonaccumulationandfavorableexplorationdirectionswerepointedout.Sha—llowlacustrinesourcerockoftheWenchangFormationintheWenc
6、hangBSagwasthemaincontributorforaccumulationinupliftingregionbesidesthewell—knownmiddle--deeplacustrinesourcerock.Attheendofdeposition,lacustrinesourcerockoftheWenchangFormationinthedownthrowofsouthernfaultexperiencedtectonicinversion,resultinginthedelayofoilgenerationandexpulsionas
7、wellasthemulti—stagesofoilcharging.ThedownthrowoffaultNo.3wasalsocharacterizedbyearlyoilgenerationandexpulsionaswellasmulti—stagesofoilcharging.FavorablelacustrinesourcerockoftheWenchangFor—marion,multi—stagesoffaultactivitiesandsetsofreservoir--caprockassemblagesworkedasthemaincont
8、rollingfactorsforhy
