1. Sichuan College of Architectural Technology, Chengdu 610399, China
2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China
3. Shale Gas Evaluation and Exploitation Key Laboratory of Sichuan Province, Chengdu 610213, China
4. Natural Gas Geology Key Laboratory of Sichuan Province, Chengdu 610500, China