寺河煤层气区块3号煤储层物性分析

Analysis on Physical Properties of the No.3 Coal Reservoir in Sihe CBM Block

基于寺河煤层气区块矿井开采资料和煤层气开发资料,采用煤层气地质理论及数理统计方法,对研究区3号煤储层物性进行了分析。结果表明:3号煤层为厚-特厚煤层,煤层气富集程度、含气量和甲烷纯度高,具有良好的含煤性和含气性;煤孔隙以过渡孔和微孔为主,大孔次之,中孔不甚发育。煤孔隙吸附甲烷性能强、吸附量大、储集甲烷空间良好;煤中裂隙发育较密,为煤层气的高效渗流产出提供了良好通道,煤层渗透率较高;煤储层压力为欠压状态,地层能量和驱动煤层气产出的动能较弱;煤对甲烷吸附时间相对较长,煤层气解吸速率较慢。研究成果以期为研究区后续煤层气开发和矿井瓦斯治理提供理论和技术支撑。

Based on the mining data and CBM development data from the caspian coalbed methane block in the monastery,the physical properties of the No. 3 coal reservoir in the study area were analyzed using the CBM theory and mathematical statistics methods. The results show that the No. 3 coal seam is a thick-to-super-thick coal seam with high coal-bed enrichment,gas content and methane purity,and good coal-bearing and gas-bearing characteristics. Coal pores mainly consist of transition pores and micropores,followed by macropores and mesopores. Coal pores have strong methane adsorption capacity,large adsorption capacity,and good methane storage space. The fissures in coal are densely developed,which provides a good channel for high-efficiency seepage production of coalbed methane,and the permeability of coal seam is high. The coal reservoir pressure is underpressure,and the formation energy and the kinetic energy to drive the coalbed gas are weaker. The adsorption time of coal to methane is relatively long and the desorption rate of coalbed methane is slow. The research results provide theoretical and technical support for the follow-up CBM development and mine gas control in the study area.