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沁水盆地晋城地区煤层气成因
石油与天然气地质
2001年 22卷 第No.4期
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Title
ORIGIN OF COAL-BED GASES IN JINCHENG AREA OF QINSHUI BASIN
作者
胡国艺
刘顺生
李景明
李剑
张建博
李志生
Authors
Hu Guoyi
Liu Shunsheng
Li Jingming
Li Jian
Zhang Jianbo
Li Zhisheng
摘要
沁水盆地晋城地区山西组和太原组煤岩中煤层气δC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δC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CO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.
Abstract
The value of δC of coal bed gas in Shanxi and Taiyuan Formations in Qinshui Basin is between-2.963%～-3.539%,which is clearly lower than the δC 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 CO 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.
关键词：
煤层气;
成因;
δ13C1;
次生作用;
晋城地区;
Keywords:
coal bed gas;
origin;
δ13C1;
secondary action;
Jingcheng area;
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