Reservoir-Forming Mechanism of Coalbed Methane in Jincheng Anthracite

With the aim of studying reservoir-forming mechanism of coalbed methane(CBM) in the area of Jincheng,through the continuous development of coalbed methane in Jincheng,the dissection of fracturing coalbed methane wells,the extraction of underground coal seam gas,the study of tectonic stress field,the CT-dissection of the fracture system of coal reservoir and the sutdy of closed preservation conditions on coalbed methane,we found that there are a lot of CBM packages in 3 coal reservoir and these CBM packages merge together because of micro-structural breakdown.As a result,the heterogeneity of reservoir in CBM packages becomes weak;the permeability increases;the proportion of free gas increases in CBM package and the fluid pressure system gradually clears.Eventually,the above factors jointly contribute to the formation of the border of coalbed methane reservoir.The study on the accumulation mechanism of coalbed methane and the characteristics of the internal details of coalbed methane reservoir promotes the development of coalbed methane exploiting technology and improves the efficiency of extracting the underground coal seam gas.