1. Key Laboratory of Mineral Resources in Coal Measures, CNACG, Key Laboratory of Shale Gas, CNACG, Jiangsu Design Institute of Geology for Mineral Resources (The Testing Center of China National Administration of Coal Geology (Cnacg), Xuzhou, Jiangsu, China
2. Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process of the Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu, China
3. Institute of Geology, Chinese Academy of Geological Sciences, Beijing, China
4. School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu, China