Analysis of the coal bed methane occurrence characteristics and gas-controlling geologic factors in Zhenzhuang block

There exist good conditions of coalbed methane (CBM) resources condition in Zhengzhuang block in the south of Qinshui basin and great potential for exploration and development. After deeply analyzing the geological and reservoir conditions of Zhengzhuang block, it is believed that there are good occurrence conditions for CBM in this area, the gas content is high and the reservoir has good adsorption and desorption capacity, but the permeability is low. The coal gas reservoir is controlled by three geology factors. Among which, the structures obviously control the occurrence of CBM and the gas content, the hydrogeological conditions have an apparent effect on the coal-bed gas. In the area, the radial flow of ground water is weak and belongs to typical equipotential slow fan flow, which is favorable for CBM accumulation. Igneous activity in Late Yanshan and abnormal geothermal field obviously controlled the thermal evolution of coal and coalbed methane.