Analysis on Coalbed Methane Characteristics and Influencing Factors of Gas Content in Middle and Deep Part of Dahe Coal Mine Area,Yunnan Province
Through testing gas content of the coalbed methane parameter wells,microscopic identification and collecting isothermal adsorption experiment data,this paper studies the coal rock,coal quality,permeability and gas content of coal reservoirs in Dahe coal mine area.The research shows that the coal seams in Dahe coal mine area are mainly fat coal in the shallow area,and mainly coking and lean coal in deep area.The permeability of most recoverable coal seams is less than 1mD,the gas saturation of coalbed methane is 14.17%～68.91%,the reservoir pressure gradient is 0.62～1.07 MPa/100m,and the critical desorption pressure is 0.26～3.03MPa.The gas content of coalbed methane is mainly affected by coal accumulating environment,thickness,depth and geological structure factors.
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