中国高煤阶地区的煤层气勘探理论与实践

通过对中美两国煤层气生成地质条件的对比,认为中国煤层气形成和富集有着不同于美国的特征。我国华南和华北地区广泛分布高煤阶煤层,煤层气资源丰富。在成煤后期多个方向和期次的构造运动改造下,部分高煤阶煤层的渗透性有可能得到改善。通过地质研究,可以在高煤阶地区找到高产富集区。在这种思路指导下,在我国沁水含煤盆地南部无烟煤地区发现了大型高煤阶煤层气田——沁水煤层气田。这不仅丰富了煤层气富集成藏理论,对于拓展煤层气勘探领域也具有重要意义。 

COALBED METHANE EXPLORATION THEORY AND PRACTICE IN THE HIGH COAL RANK AREAS OF CHINA

There is obvious difference between the distribution of coalbed methane in the U.S. and in China, based on the comparison between origination condition. Large amount of coalbed methane resource is distributed in the high coal rank area of China, especially in the North and South China. Postsedimentary tectonic activities may lead to high permeability and high gas content. These potential sweet points could be found through detailed geologic study. Guided by this theory, the first coalbed methane gas field in China located in the high coal rank area was discovered in the 1990s, which has edriched the theory and expanded the exploration scope of coalbed methane.