淮南矿区剩余煤层气资源可采潜力分析

在分析淮南矿区煤层气地质背景的基础上,采用含量梯度法、压力—吸附法计算了研究区可采煤层的剩余煤层气资源量,探讨了影响该区煤层气可采潜力的煤储层压力、渗透能力、吸附/解吸特征、含气饱和度、可采系数等因素。结果表明,淮南矿区-1 500m以浅剩余煤层气资源量为2 419.70×108m3,可采资源量为1 102.20×108m3,可采资源丰度为1.98×108m3/km2,属于中等储量丰度的大型气田;区内煤储层为正常压力储层,煤储层渗透率、含气饱和度偏低,但本区可采煤层层数多,在渗透率总体偏低的背景下,区内存在的高渗区,具备煤层气地面开采的基础地质条件。

An Analysis of Production Potential of Residual CBM in Huainan Mining Area

On the basis of analyzing the coalbed methane（CBM） geologic settings,the authors estimated residual CBM resource in the Huainan mining area using content gradient and pressure-adsorption methods,discussed factors influencing production potential of CBM,namely coal reservoir pressure,permeability,adsorption/desorption characteristics,gas saturation and mineable coefficient.The results show that Huinan mining area belongs to a medium reserve abundance large-sized gas field with residual resource 2419.70×108m3,recoverable resource 1102.20×108m3,recoverable resource abundance 1.98×108m3/km2 above-1500m level.In the study area the gas reservoir pressure is normal,while permeability and gas saturation are on the low side.Since the area＇s multiple mineable coal seams,although under the general low permeability background,still has areas of high permeability existed and provided with geological condition of surface mining of CBM.