石油与天然气地质 ›› 2001, Vol. 22 ›› Issue (4): 319-321.doi: 10.11743/ogg20010407

• 油气空间 • 上一篇    下一篇

沁水盆地晋城地区煤层气成因

胡国艺1,2, 刘顺生1, 李景明2, 李剑2, 张建博2, 李志生2   

  1. 1. 中国科学院长沙大地构造所, 湖南长沙, 410000;
    2. 石油勘探开发研究院廊坊分院, 河北廊坊, 065007
  • 收稿日期:2001-03-26 出版日期:2001-12-25 发布日期:2012-01-16

ORIGIN OF COAL-BED GASES IN JINCHENG AREA OF QINSHUI BASIN

Hu Guoyi1,2, Liu Shunsheng1, Li Jingming2, Li Jian2, Zhang Jianbo2, Li Zhisheng 2   

  1. 1. Changsha Institute of Geotectonics, Chines Academy of Sciences, Changsha, Hunan;
    2. Langfang Branch of Research Institute of Petroleum Exploration and Developmet, Langfang, Hebei
  • Received:2001-03-26 Online:2001-12-25 Published:2012-01-16

PDF (PC)

610

被引次数

128

摘要：

沁水盆地晋城地区山西组和太原组煤岩中煤层气δ13C1值为-2.963%～-3.539%,明显低于模拟实验和经验公式计算的原生煤层气δ13C1值(-2.701%),由此判断其为次生煤层气.由于该区煤层气组分中,甲烷含量占绝对优势(>98%),不存在甲烷和CO2碳同位素的交换,而且其保存条件良好,也不可能受到次生生物作用的影响,所以,煤层的解吸-扩散-运移作用才是晋城地区次生煤层气形成的真正原因.

关键词: 煤层气, 成因, δ13C1, 次生作用, 晋城地区

Abstract:

The value of δ13C1 of coal bed gas in Shanxi and Taiyuan Formations in Qinshui Basin is between-2.963%～-3.539%,which is clearly lower than the δ13C1 value(-2.701%) of simulation test and that calculated by empirical formula.The gas is thus considered to be secondary coal bed gas.The contents of methane in coal bed gas in the study area is more than 98%,and there is no exchange of methane and CO2 isotope,the preservation condition is good.So it is suggested that desorption diffusion migration shuld be the real origin of the secondary coal bed gas in the study area.

Key words: coal bed gas, origin, δ13C1, secondary action, Jingcheng area

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