1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, People’s Republic of China
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, People’s Republic of China
3. Shale Gas Institute of PetroChina Southwest Oil & Gasfield Company, Chengdu 610051, People’s Republic of China