1. School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
2. Coal Reservoir Laboratory of National Engineering Research Center of CBM Development & Utilization, China University of Geosciences (Beijing), Beijing 100083, China
3. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
4. Klohn Crippen Berger Ltd., Brisbane, Queensland 4101, Australia
5. Institute of Applied Mechanics, University of Stuttgart, Stuttgart 70569, Germany