1. Institute of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000, PR China
2. Research and Application Center of Gas Geology, (Yangquan Xinyu Geotechnical Engineering Co., Ltd.), Huayang New Material Technology Group Co., Ltd., Yangquan 045000, PR China
3. School of Earth Resources, China University of Geosciences (Wuhan), Wuhan 430074, PR China
4. CNNC Geologic Party No. 208, Baotou 014010, PR China