关键词: 深煤层, 含气量, 储层温度, 储层压力

Abstract: The exploration and exploitation of coalbed methane (CBM) have gradually turned into deep coal seams (beneath one thousand meters). Taking the southern Qinshui basin as the researching background, collecting shallow and deep coal samples and integrating with adsorption isothermal experiments, this paper analyzes and predicts the gas content of deep coal seams. The results show that: with the depth increases, the gas content first increase and then decrease; the gas content of No.15 coal seam is larger than No.3 coal seam. The predicted value of coal bed gas content of North Shizhuang district reaches maximum when the depth is between 900m and 1100m, and it is close to the measured value. In a word, the deep coal seam has a transition zone, the depth of this zone is between 600m and 1100m. And in this zone, the gas content changes. This is due to the reservoir stress and temperature, which changes the coal reservoir physical properties.