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时间:2020-04-19
《琼海凸起新近系低幅-低阻油藏形成条件及成藏模式.pdf》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35卷第3期OIL&GASGEOLOGY2014年6月文章编号:0253-9985(2014)03-0311-06doi:10.11743/ogg201403琼海凸起新近系低幅-低阻油藏形成条件及成藏模式甘军,张迎朝,邓广君,陆江,郑榕芬[中海石油(中国)有限公司湛江分公司勘探开发研究院,广东湛江524057]摘要:综合应用油气地球化学、储层沉积学及成藏综合研究方法,剖析了琼海凸起文昌13区珠江组一段低幅-低阻油藏的油气来源、运移及成藏特征,深化了该区高阻、低阻油层成藏过程及运聚规律的认识。研究表明:1)文昌13-X珠江组一段低阻油层的原油主要来自文昌A凹陷恩
2、平组浅湖相泥岩,该套烃源岩是文昌凹陷除文昌组中深湖泥岩之外的又一套优质生油岩。2)文昌13区珠江组一段低阻油层具备发育在低幅度披覆背斜上的构造+岩性成藏模式,储层类型为浅海低能环境下发育的滨外砂坝泥质粉砂岩,储层岩性细、泥质含量高是低阻油层形成的主要原因。3)本区低阻油藏具备圈闭低幅度、储层低渗的特征,油气运移进入圈闭需要克服较大的毛细管阻力。4)本区珠江组一段低阻油层是其下覆高阻油层的次生油藏,形成纵向上高阻、低阻油层叠置伴生的油气富集带;低幅-低阻油藏勘探开发潜力大,是成熟区挖潜的重要领域。关键词:低幅构造;低阻油层;恩平组;琼海凸起中图分类号:TE122.
3、3 文献标识码:AFormingconditionsandhydrocarbonaccumulationpatternsoftheNeogenelowresistivityreservoirsinlow-amplitudestructureofQionghaiSalientGanJun,ZhangYingzhao,DengGuangjun,LuJiang,ZhengRongfen(ResearchInstituteofPetroleumExploration&Developmen,ZhanjiangBranchofCNOOC,Zhanjiang,Guangd
4、ong524057,China)Abstract:Usinggeochemical,sedimentaryandhydrocarbonaccumulationanalysismethods,thispaperstudiedthecharac-stteristicsofsourcerocks,hydrocarbonmigrationandaccumulationofthelowresistivityreservoirsofthe1MemberofZhu-jiangFormation(Zhu1)inthelow-amplitudestructureofQiongha
5、isalientinWenchang-13block,Qionghaisalient.Thefollowingresultswereobtained.TheoiloftheZhu1lowresistivityreservoirinWenchang13-XismainlysourcedfromtheshallowlacustrinemudstoneofEnpingFormationinWenchangsag,whichisanotherhighqualitysourcerockinadditiontotheWenchangFormationmudstoneofmi
6、d-deeplacustrinefaciesin.ThelowresistivityreservoirsofZhu1inWen-chang13blockareofstructural-lithologiccompositetypedevelopedinthelowamplitudedrapeanticlines.Themainreser-voirconsistsofoffshorefinemuddysiltstonewithfinegrainandhighmudcontent,whicharethemaincausesofthelowresistivity.Th
7、elowresistivityreservoirsareacharacterizedbylowamplitudestructureandlowpermeability.Thelowresis-tivityreservoirsaresecondaryaccumulationwithhydrocarbonssourcedfromtheunderlyinghighresistivityreservoir.Thelowresistivityandhighresistivityreservoirssuperimposeverticallytoformahydrocarbo
8、nenrichmentz
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