1. Key
Laboratory of Shale Gas and Geoengineering, Institute of Geology and
Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Department
of Energy and Mineral Engineering, G3 Center and EMS Energy Institute, The Pennsylvania State University, University Park, PA 16802, United States
4. College of Resources & Safety Engineering, China University of Mining and Technology, Beijing 100083, China