黔西松河井田多层叠置独立含煤层气系统

从研究区含煤岩系地质、沉积构造和水文等方面入手，探讨了松河井田龙潭组含煤层气系统垂向上的分布规律。结果表明:该区煤层硫分与灰分总体上呈上、下高，中间低的规律；煤层含气量由顶部至底部总体呈现“上升-下降-上升”的趋势；煤层埋深-压力系数关系揭示煤层垂向上至少可划分为2套压力系统。龙潭组3个二级层序与3个岩性分段的地层界限较为一致，奠定了独立含煤层气系统的物质基础；每套系统之间缺乏水力联系，富水性呈“弱-中等-弱”的变化规律，构成了独立含煤层气系统的水文地质基础。龙潭组多层叠置独立含煤层气系统，是沉积-水文-构造条件耦合控气作用的产物，划分为3个独立含煤层气系统。研究结果为松河井田煤层气勘探开发提供地质依据。 

Unattached multiple layer superimposed coalbed methane system in Songhe mine,west Guizhou

From aspects of reservoir geology, sedimentary structure and hydrology, this paper has explored the vertical distribution of coalbed methane system of Longtan Formation in Songhe mine. The results show the regularity that ash and sulfur are high in the upper and the lower but low in the middle of the system. From the top to the bottom, the CBM content has the trend of rise-fall-rise. There are two sets of pressure systems in the correlation between the coal seam depth and the pressure coefficient. The three secondary sequences are highly consistent with the three lithologic sections which lay the physical property base of the systems. There is no hydraulic connection between the systems and the water abundance has the regularity of being weak-medium-weak which supply a hydrogeological base. The coal-bearing strata of Longtan Formation are an unattached multiple superimposed coalbed methane system which is jointly controlled by sedimentary, hydrogeological and structural conditions and can be divided into three unattached coalbed methane-bearing system. The research results provide geological basis for exploration development of the coalbed methane in Songhe mine.