非常规天然气

渝东南地区寒武系牛蹄塘组页岩气成因探讨

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  • 1.甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室,甘肃 兰州 730000;
    2.中国科学院大学,北京 100049
吴陈君(1988-),男,安徽池州人,助理研究员,博士,主要从事油气地球化学研究. E-mail:wcj627@163.com.

收稿日期: 2015-04-28

  修回日期: 2015-05-22

  网络出版日期: 2015-08-10

基金资助

国家重点基础研究发展计划("973”)项目(编号:2012CB214701);中国科学院西部行动计划项目(编号:KZCX2-XB3-12);中国科学院油气资源研究重点实验室开放基金;甘肃省科技计划(编号:1309RTSA041)联合资助.

The Origin of Cambrian Niutitang Shale Gas in Southeastern Chongqing

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  • 1.Gansu Provincial Key Laboratory of Petroleum Resources/Key Laboratory of Petroleum Resources Research,
    Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China;
    2.University of Chinese Academy of Sciences,Beijing 100049,China

Received date: 2015-04-28

  Revised date: 2015-05-22

  Online published: 2015-08-10

摘要

渝东南地区是上扬子板块组成的重要部分,是未来中国页岩气勘探开发的重点区域。从有机质丰度、类型以及母质来源方面讨论了研究区寒武系牛蹄塘组页岩的生烃能力,整个剖面有机质丰度平均高达7.0%,有机质类型属于生油型的I型干酪根,生烃能力较好。但研究区页岩样品氯仿沥青“A”、生烃潜量(S1+S2)以及氢指数(IH)等生烃能力参数都极低,表明富有机质页岩生油高峰期生成的大量液态烃在高—过成熟阶段被消耗。利用真空破碎解析方法提取了页岩中的滞留气,解析气以甲烷为主。烷烃气体碳同位素呈正序分布特征,δ13C1平均值为-36.1‰,为典型的热成因气;δ13C2值分布在-39.6‰~-18.6‰之间,大部分接近或高于δ13Corg值。解析气地球化学特征进一步证实了研究区牛蹄塘组页岩气主要由液态烃在高温条件下裂解形成。

本文引用格式

吴陈君,张明峰,孙丽娜,刘艳,妥进才 . 渝东南地区寒武系牛蹄塘组页岩气成因探讨[J]. 天然气地球科学, 2015 , 26(8) : 1481 -1487 . DOI: 10.11764/j.issn.1672-1926.2015.08.1481

Abstract

Southeastern Chongqing is an important part of upper Yangtze plate.It's also a key area of shale gas exploration and development of China in the future.Hydrocarbon generation potential of Lower Cambrian Niutitang shale is discussed according to the analysis on organic matter abundance,type and source material.Niutitang shale is characterized by high organic content,with an average of 7%.The organic matter is dominated by type I,with high oil generation potential.Bitumen A,hydrocarbon generation potential(S1+S2)and hydrogen index(IH)are very low,indicating that liquid hydrocarbon which was generated during oil-generation peak period may be used up at high-over mature stage.Remaining gas was extracted by vacuum crushing analytical method,mainly containing methane.Carbon isotope distribution pattern was positive.δ13C1averages at-36.1‰,showing typical heat causes.δ13C2ranges between-39.6‰ and-18.6‰.Majority of studied shale samples possess δ13C2close to δ13Corg,or even heavier.Analysis of gas geochemical characteristics of hydrocarbon gas shale further confirmed that Niutitang shale gas is mainly from liquid hydrocarbon cracking under high temperature conditions.

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