1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
2. Sichuan Changning Natural Gas Development Company Limited, Chengdu, Sichuan 610051, China
3. Shale Gas Institute of PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610051, China
4. Baikouquan Oil Production Plant of PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834011, China