山西省煤层气资源量及可采潜力

摘要

山西省煤层气资源丰富，开发条件优越。在以往研究成果的基础上，根据大量的煤田钻孔、煤层气井和煤样等温吸附实验等资料，分析了煤层含气性、煤级、储层压力、温度、煤的吸附能力、含气饱和度等特征，对山西省深部煤层含气量进行了预测，估算了煤层气资源量及可采潜力。研究结果表明，煤级、储层压力、温度、煤的吸附能力、含气饱和度等参数直接或间接受埋深控制，并通过等温吸附方程综合影响深部煤层含气量，含气量随埋深的增加而增加，但增加趋势变缓；估算2000m以浅煤层气资源量约8.3万亿m3，煤层气平均可采系数在30.0%～56.7%。%CBM resources are abundant with superior exploitation condition in the Shanxi Province. Based on previous studied results, according to large amount data from coalfield boreholes, CBM wells and coal sample isothermal adsorption tests, analyzed characteris-tics of coal seam gas-bearing property, coal rank, reservoir pressure, temperature, coal adsorptivity, gas saturation carried out deep part CBM content prediction in the province;estimated CBM resources and exploitation potential. The result has shown that parameters of coal rank, reservoir pressure, temperature, coal adsorptivity and gas saturation are directly or indirectly controlled by buried depth, and through isothermal adsorption comprehensively impacted deep part CBM content. The content is increasing along with buried depth in-creasing, but increasing trend slowing down. Estimated CBM resources above depth 2 000m have about 8.3 trillion m3;average exploit-able rate is 30.0%~56.7%.