天然气地球科学
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天然气地球科学 ›› 2003, Vol. 14 ›› Issue (2): 92–96.doi: 10.11764/j.issn.1672-1926.2003.02.92

• 综述与评述 • 上一篇    下一篇

煤成甲烷碳同位素演化的数学模型与应用

邹艳荣, 帅燕华, 孔枫, 彭平安   

  1. (中国科学院广州地球化学研究所，有机地球化学国家重点实验室，广州510640)
  • 收稿日期:2003-02-12 修回日期:2003-03-20 出版日期:2003-04-20 发布日期:2003-04-20
  • 通讯作者: 邹艳荣
  • 作者简介:邹艳荣(1959-)，男，黑龙江勃利人，研究员，主要从事油气地球化学和动力学研究.

MATHEMATIC MODELS OF STABLE CARBON IS OTOPE COMPOSITION OFCOAL-DERIVED METHANE AND THEIR APPLICATIONS

ZOU Yan-Rong, SHUAI Yan-hua, KONG Feng, PENG Ping-an   

  1. （The State Key Laboratory of Organic Geochemistry, Guangzhou Institu te of Geochemistry,Chinese Academy of Sciences, Guangzhou 510640, China）
  • Received:2003-02-12 Revised:2003-03-20 Online:2003-04-20 Published:2003-04-20

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摘要：

分别介绍了以统计为基础的甲烷碳同位素与源岩成熟度关系的关系模型、以 Rayleigh方程为基础的同位素分馏模型和以动力学为基础的同位素动力学模型等 3种模拟煤成甲烷同位素演化的数学模型 ,评价了其应用范围和应用效果。用这 3种模型恢复了塔里木盆地克拉 2气田煤成气的聚散史后认为 ,克拉 2气田的天然气可能是源岩成熟过程中长期累积形成的 ,早期形成的天然气仅有少量散失 ,而晚期形成的天然气因超压而无法充注到气藏中。

关键词: 煤成甲烷, 稳定碳同位素, 关系模型, 分馏模型, 动力学模型

Abstract:

 In this paper different mathematic models are discussed, including the relations hip models connected the stable carbon isotope composition with source rock matu ration, distillation models based on Rayleigh expression and kinetic models, and  a relationship diagram between instantaneous and accumulation carbon isotope co mposition linked to source bed maturity is proposed on the basis of other resear chers, which can be used to roughly estimate the accumulation/loss history of co al-derived gas pool. Applicable extents of different models are illustrated. The  gas accumulation/loss history of Kela 2 gas pool in the Kuqua depression of Tar im Basin, the biggest gas field of China, is restructured as an example by using  isotope kinetic model and others. The results suggest that the natural gas of K ela 2 pool, with the carbon isotopic value of -27.78‰~-27.73‰, cumulated fro m early stage of gas generation to about 2.0 Ma, which was hardly lost during th e source rock maturation and gas generation because of coalbeds with strong abso rbability. However, the late generated gas was not filled into this pool due to  the overpressure development starting at about 2.0 Ma, which is supported by non -hydrocarbon components in this gas pool.

Key words: Coal, derived gas, Stable carbon isotope composition, Relationship model, Distillation model, Kinetic model.

中图分类号: 

  • TE122.1+13

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