1. School of Geoscience and Technology Southwest Petroleum University Chengdu 610500 China
2. Key Laboratory of Sedimentary Basin and Oil and Gas Resources Ministry of Natural Resources Chengdu 610081 China
3. State Key Laboratory of Petroleum Resource & Prospecting China University of Petroleum Beijing 102249 China
4. Cooperative Innovation Center of Shale Gas Resources and Environments Southwest Petroleum University Chengdu 610500 China
5. Chengdu Center China Geological Survey Chengdu 610081 China
6. Research Institute of Petroleum Exploration and Development, PetroChina Beijing 100083 China
7. Beijing Center for Physical and Chemical Analysis Beijing 100089 China