煤层气藏特征浅析

分析阐述了煤层气在成生、集集与运移特征，以及煤层气成藏的基本条件，列举了几种主要的有效煤层气藏类型，旨在更好地勘探开发利用煤层气资源，拓展能源应用领域。

The Elementary Studies on the Characteristics of Coalbed Gas Reservoirs

Coalbed gas is a kind of unconventional natural gas generated during the coalification, which is mainly composed of methane. Different from a conventional gas reservoir, a coalbed gas reservoir belongs to a typical self-generated and self-reserved gas reservoir. Due to the special porous structure, coalbed gas is mainly stored up in a coalbed at a state of sorption, the amount of gas absorbed is much greater than that of gas being free or in resolution, which stays in the fractures. At the reservoir's temperature and pressure, coalbed gas moves in a way of desorption-diffusion-flowing, significantly different from that of natural gas in a sandstone seam. During the development of geology history,a fairly large coalbed gas reservoir can be formed since the coalbeds are abundant in gas resources, have higher permeabilities, have not been destroyed badly by the later tectonic movements, and have good conditions to seal and preserve the gas.