1. PetroChina Southwest Oil and Gas Field Company, Chengdu, China
2. Shale Gas Evaluation and Exploitation Key Laboratory of Sichuan Province, Chengdu, China
3. Institute of Exploration and Development, PetroChina Southwest Oil and Gas Field Company, Chengdu, China
4. Sichuan Kelite Oil and Gas Technology Service Limited Company, Chengdu, China