1. China National Petroleum Corporation, Research Institute of Petroleum Exploration & Development, 100083 Beijing, China
2. National Energy Shale Gas Research & Development (Experiment) Center, 065007 Langfang, China
3. School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK
4. Institute of Geology and Geophysics, Chinese Academy of Sciences (IGG-CAS), 100029 Beijing, China
5. Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, 730000 Lanzhou, China