1. School of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000, China
2. Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Jiaozuo 454000, Henan Province China
3. Henan International Joint Laboratory for Unconventional Energy Geology and Development, Jiaozuo 454000, China
4. China Petroleum Exploration and Development Research Institute, Beijing 100083, China
5. PetroChina North China Oilfield Shanxi Coalbed Methane Exploration and Development Branch, Changzhi 046000, China