沁水盆地深煤层煤层气资源量巨大，随着勘探和开采深度的增加，煤储层物性变差，而且不同参数的变化不具有协同性。本文以体积法计算了沁水盆地风化带~ 600 m、600 ~ 800 m、800 ~ 1 000 m、1 000 ~ 1 200 m、1 200 ~ 1 500 m和1 500～ 2 000 m 不同深度的煤层气地质资源量和可采资源量，提出了煤体体积的计算方法，煤层平面投影面积与伪厚度之积可以代表煤体真实体积。计算结果表明，沁水盆地3号煤与15号煤两煤层合计2 000 m以浅的煤层气地质资源量为31 107.95×108 m3，1 500 m以浅的可采资源量为9 265.28×108 m3。其中埋深800 ~ 2 000 m的地质资源量为17 835.38×108 m3，埋深800 ~ 1500 m的可采资源量为5 298.11×108 m3，分别占两煤层的57.33%和57.24%。

 The deep coal seam in Qinshui Basin has a huge amount of coalbed methane resources. With the increase of exploration and mining depth, the physical properties of coal reservoirs become worse, and the changes of different parameters are not synergistic. In this paper, the geological resources and recoverable resources of coalbed methane at different depths of ~ 600 m, 600 ~ 800 m, 800 ~ 1 000 m, 1 000 ~ 1 200 m, 1 200 ~ 1 500 m and 1 500 ~ 2 000 m in the weathered zone of Qinshui Basin are calculated by volume method. The calculation method of coal volume is proposed. The product of plane projection area and pseudo thickness of coal seam can represent the real volume of coal body. The calculation results show that the total amount of CBM geological resources above 2 000 m in No.3 coal seam and No.15 coal seam in Qinshui Basin is 31 107.95 × 108 m3, and the recoverable resources above 1 500 m are 9 265.28 × 108 m3. Among them, the geological resources with a buried depth of 800 ~ 2 000 m are 17 835.38 × 108 m3, and the recoverable resources with a buried depth of 800 ~ 1 500 m are 5 298.11 × 108 m3, accounting for 57.33 % and 57.24 % of the two coal seams, respectively.