天然气地球科学 ›› 2008, Vol. 19 ›› Issue (06): 754–760.doi: 10.11764/j.issn.1672-1926.2008.06.754

• 天然气地球化学 • 上一篇    下一篇

吐哈盆地烃源岩研究进展与低演化油气的形成

王作栋1,2;陶明信3;孟仟祥1;李中平1;王晓锋1;王志勇4;杜宏宇4   

  1. 1.中国科学院地质与地球物理研究所气体地球化学重点实验室,甘肃 兰州 730000;
    2.中国科学院研究生院,北京 100049;
    3.北京师范大学资源环境学院,地表过程与资源生态国家重点实验室,北京 100875;
    4.中国石油吐哈分公司勘探开发研究院,新疆 哈密 839009
  • 收稿日期:2008-10-10 修回日期:2008-11-06 出版日期:2008-12-10 发布日期:2008-12-10

Research Progress of Source Rocks and Formationof Low Evolution Oil and Gas in Turpan-Hami Basin

Wang Zuo-dong 1,2; TAO Ming-xin3;MENG Qian-xiang1; LI Zhong-ping1;WANG Xiao-feng1;WANG Zhi-yong4;DU Hong-yu4   

  1. 1. Key Laboratory of Gas Geochemistry, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China; 2. Graduate School of Chinese Academy of Sciences, Beijing 100049, China; 3. State Key Laboratory of Earth Surface Processes and Resource Ecology,College of Resource Science and Technology, Beijing Normal University, Beijing 100875, China; 4. Research Institute of Exploration and Development, Turpan-Hami Oilfield, PetroChina, Hami 839009, China)
  • Received:2008-10-10 Revised:2008-11-06 Online:2008-12-10 Published:2008-12-10

摘要:

通过对吐哈盆地中、下侏罗统6块源岩抽提物的饱和烃和芳烃馏分进行有机地球化学研究,除进一步印证了前人一些主要结论(如母源输入以高等植物为主、有机质类型以Ⅲ型为主和源岩演化程度低等)外,还发现了一些富有科学意义的新的现象与特征,主要包括:源岩样品中含较高丰度的树脂体类化合物;样品中存在八硫环形式的单质硫;源岩有机质经受过较明显的生物降解作用。认为树脂体类化合物是低演化烃的重要母质,单质硫八硫环和生物降解作用都会导致有机质成烃活化能降低,从而促使有机质在较低的热演化阶段形成油气;这些新的发现对于认识源岩在低演化阶段形成商业性的低熟气储层具有重要意义;吐哈盆地有机质成熟度主体处于RO<0.8%的演化阶段,所生成的原油应为低演化阶段的油,天然气则相应为低熟气。

关键词: 烃源岩, 单质硫:低熟气, 研究进展, 吐哈盆地

Abstract:

Geochemical studies were carried out on the saturated and aromatic hydrocarbon fraction of six source rocks collected from the Middle to Lower Jurassic of Turpan Hami basin. In the study, we proved some views proposed by the predecessors (1. the organic matter input is mainly higher plants; 2. the organic matter types of source rock are mainly type Ⅲ; 3. the source rocks evolution degree is low). At the same time, some new significant findings were revealed (for instance, the Turpan Hami Basin source rock samples have a high abundance of resin compounds, the organic matter in source rocks suffered a significant biodegradation, and 8S (sulfur) ring substance is also found in the samples). These substances and the geological action will ultimately lead the activation energy to be greatly reduced, which make it easily to form oil and gas at the lower stage of thermal evolution. The research indicates that the thermal evolution degree of organic matter is less than 0.8% (RO), and the resulting oil and gas are categorized as immature oil and low mature gas, respectively. These findings may have important significance to understand the mechanism of oil and gas formation and accumulation,especially for the low-mature gas.

Key words: Source rock, Element sulfur, Low-ature gas, Research progress, Turpan-Hami basin.

中图分类号: 

  • TE122.1+13

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