浅议我国西北低煤阶含煤盆地煤层气的勘探对策

通过国内外实例，分析含气量和含气饱和度在煤层气勘探评价中的作用，认为在低煤阶含煤盆地中进行煤层气勘探很有前景。美国的粉河、尤因塔盆地和我国的铁法盆地的煤阶都为低煤阶，含气量也不高，但都获得了商业气流，勘探见到了成效。其主要原因在于它们都具有较高的含气饱和度，加之煤层巨厚和渗透率较高，这些有利因素弥补了其它方面的不利。在我国的煤炭和煤层气资源分布中，西北地区低煤阶煤占了相当的比例，结合实例和分析西北低煤阶盆地的特点后认为：在西北含煤盆地进行煤层气勘探必须重视生物成因气的研究，加强盆地的水动力因素及保存条件的研究。

The exploration strategy of coal bed methane of coal basin in low coal rank in northwestern China

This paper analyzes the importance of gas content and gas saturation in foreign and domestic coal bed methane (CBM) exploration. Powder River basin, Uinta basin of USA and Tiefa basin of China are all low coal rank basins. The gas contents of them are all not so high. But the permeability and thickness of these basins are higher. They all get the commercial gas rates, and exploration successful. There are a lot of CBM resources in low coal rank area in northwest China. So it is very important for the low coal rank area to explore CBM, especially in northwestern China. And people must pay more attention to the preservation conditions of CBM in exploration of low coal rank basin in China.