1. Engineering Technology Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610000, China
2. PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610000, China
3. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
4. Shale Gas Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu 610051, China