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Crude oil types of the Well Qiang D-2 in Qiangtang Basin, Tibet and its exploration significance
Author(s): 
Pages: 1070-1076
Year: Issue:  6
Journal: Acta Petrolei Sinica

Keyword:  Qiangtang BasinWell Qiang D-2oil classificationoil-source correlationMiddle Jurassic;
Abstract: 羌D2井是目前羌塘盆地首口钻遇侏罗系布曲组含油层的地质井.通过对白云岩油层岩心样品系统采样和分析,发现钻井原油有两种类型.根据生物分子标志化合物中类异戊二烯烃、甾烷、萜烷系列进行的油源对比研究,初步认为羌塘盆地不同类型的两类原油可能有不同的来源,产自于不同环境的烃源岩之中.第一类原油来源于开阔海环境,生油母质以低等水生物为主,与侏罗系下统曲色组、中统布曲组烃源岩具有亲缘性;第二类原油来自于具有大量淡水注入的海湾河口环境,生油母质中高等植物标志显示明显,烃类可能来自侏罗系中统雀莫错组或夏里组烃源岩.该研究结果对确定羌塘盆地生油层系、圈定生烃洼陷具有指导意义.
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