1. School of Energy Resources, China University of Geosciences (Beijing), Beuijing 100083, China
2. Coal Reservoir Laboratory of National Engineering Research Center of CBM Development & Utilization, China University of Geosciences (Beijing), Beijing 100083, China
3. School of Safety Science and Engineering, Changzhou University, Changzhou 213164, Jiangsu, China
4. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi’an 710018, China
5. National Engineering Laboratory of Low-permeability Oil & Gas Exploration and Development, Xi’an 710018, China