塔里木盆地塔西南坳陷和田凹陷普司格组烃源岩沉积环境及有机地球化学特征

发布时间：2018-03-08 14:46

  本文选题：和田凹陷　切入点：普司格组　出处：《天然气地球科学》2017年11期 　论文类型：期刊论文

【摘要】：二叠系是叶城—和田凹陷最为重要的烃源岩层系之一。通过和田凹陷杜瓦地区野外露头剖面及最新钻井分析,并结合有机地球化学测试数据,对二叠系普司格组烃源岩沉积特征、古环境及有机地球化学特征进行研究。结果表明:普司格组烃源岩发育在滨湖、浅湖及半深湖亚相中,乌鲁吾斯塘地区和杜瓦地区为烃源岩沉降中心,以低Pr/Ph值、较高伽马蜡烷指数等为特征,表现出较强还原性、较高盐度下具有一定水体分层的湖相沉积产物。普司格组烃源岩有机碳(TOC)值为0.12%~5.68%,为"差—中等"烃源岩,有机质类型以Ⅱ型、Ⅲ型为主,镜质体反射率RO值为0.72%~1.385%,主体已进入成熟—高成熟阶段。结合地震资料、生储盖条件分析认为,杜瓦地区普司格组烃源岩生烃潜力较好,逆冲推覆体为油气勘探的可能有利区域,准原地质体为塔西南坳陷山前带最为有利的油气勘探区域,原地质体埋深很大,是目前勘探工作面临的主要挑战之一。
[Abstract]:Permian is one of the most important source rock systems in Yecheng-Hotan Sag. Through field outcrop profile and latest drilling analysis in Dua area of Hetian Sag, combined with organic geochemical test data, The sedimentary characteristics, paleoenvironment and organic geochemistry of the Permian Bussiger source rocks are studied. The results show that the source rocks of the Permian are developed in littoral, shallow and semi-deep lacustrine subfacies. The Wulustang area and the Duwa area are the center of source rock subsidence, which are characterized by low Pr/Ph value and high gamma alkane index. The organic carbon toc value of Bussiger source rock is 0.12 ~ 5.68, which is "poor to medium" source rock. The organic matter types are mainly type 鈪，

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