天然气地球化学

柴达木盆地北缘冷湖地区下侏罗统烃源岩评价

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  • (1.长江大学地球化学系,湖北 荆州 434023;2.长江大学油气资源与勘探技术教育部重点实验室,湖北 荆州 434023;3.中国石油勘探开发研究院,北京100083;4.长江大学地球科学学院,湖北 荆州 434023)

收稿日期: 2008-05-20

  修回日期: 2008-08-30

  网络出版日期: 2008-10-10

Evaluation on Hydrocarbon Source Rock of Lower Jurassic, Lenghu Area, Northern Margin of Qaidam Basin

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  • (1. Department of Geochemistry, Yangtze University, Jingzhou 434023, China;  2. Ministry of Education Key Laboratory of Exploration Technology for Oil and Gas Resources, Yangtze University, Jingzhou 434023, China;  3. Research Institute of Petroleum exploration and Development, PetroChina, Beijing 100083, China;  4. School of GeoSciences; Yangtze University, Jingzhou 434023,China)

Received date: 2008-05-20

  Revised date: 2008-08-30

  Online published: 2008-10-10

摘要

基于有机岩石学理论,对柴达木盆地北缘冷湖地区下侏罗统烃源岩进行系统的研究评价,结果表明:冷湖地区下侏罗统烃源岩有机碳含量在2.58%~6.7%之间,生烃潜量在10.5~13.6 mg/g之间, 有机质丰度高,属好烃源岩。根据该区烃源岩热解特征(Tmax与IH、D%的关系)及甾烷C27-C28-C29三角图判定其有机质类型以Ⅱ1型、Ⅱ2型为主,部分为Ⅰ型,以陆源有机质输入为主,混有水生浮游动植物。根据RO、CPI、C31升藿烷22S/(22S+22R)值、C2920S/(20S+20R)值、C29 ββ/(αα+ββ)值和Ts/Tm等值随深度增加呈现出有规律变化的特点,认为该区烃源岩大部分处于低熟—成熟阶段,小部分已经达到高成熟阶段。

本文引用格式

徐文;包建平,;刘婷,;银晓 . 柴达木盆地北缘冷湖地区下侏罗统烃源岩评价[J]. 天然气地球科学, 2008 , 19(05) : 707 -712 . DOI: 10.11764/j.issn.1672-1926.2008.05.707

Abstract

By the theory of the organic petrology, this paper evaluates and researches the source rock of the Lower Jurassic in the Lenghu Area of the northern margin of the Qaidam Basin.The source rock’s TOC content is between 2.58 to 6.7 percent, the hydrocarbon\|generating potential is between 10.5 to 13.6 mg/g, the abundance of organic material is high, and it is high quality source rock; According to local source rock pyrolysis characteristics (relations of Tmax and IH, D%) and steranes C27-C28-C29 triangle figure, the organic material type is dominantly Ⅱ1, Ⅱ2, in part is Ⅰ, and the land\|derived organic material is primary component, mixed with plankton. RO, CPI, C31 homohopanen22 S / (22S +22 R), C2920S / (20S +20 R), C29 ββ / (αα + ββ) and Ts / Tm, these common parameters display regular changes with depth, revealing that most source rock in this area is in a low\|mature and mature level, and a small portion is over mature.

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