1. Key Laboratory of Coalbed Methane Resources and Dynamic Accumulation Process, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu Province 221008, China
2. Unconventional Oil and Gas Key Laboratory of CNPC, Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
3. School of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000, China