贵州文家坝一矿水文地质条件对煤层气成藏控制分析

Control Analysis of Hydrogeological Conditions on CBM Reservoir Formation in Wenjiaba No.1 Coal Mine in Guizhou

根据井田内地质勘探资料,分析了井田内地层含、隔水层水文地质特征。结果表明:向斜翼部地下水向轴部径流过程中溶解煤层气中的甲烷在轴部聚集,导致翼部煤层含气量低;向斜轴部地下水滞流形成承压水环境,水动力弱,煤层气受水压作用而吸附于煤层中,导致煤层气含量富集于向斜轴部,形成承压水封堵煤层气藏。

Based on the geological exploration data in the mine field,the hydrogeological characteristics of the aquifer and aquifer in the mine field are analyzed.The results show that methane dissolved in coalbed methane accumulates in the axis during the process of groundwater runoff from the syncline wing,resulting in low gas content in the coalbed;the stagnation of groundwater in the syncline axis forms a confined water environment with weak hydrodynamic force,and coalbed methane is adsorbed in the coalbed by water pressure,resulting in the concentration of coalbed methane in the syncline axis and the formation of confined water plugging coalbed methane reservoir.