1. Chengdu University of Technology, State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610059, China and Chengdu University of Technology, Key Laboratory of Earth Exploration and Information Techniques of Ministry of Education, Chengdu 610059, China.(corresponding author).
2. Chengdu University of Technology, Key Laboratory of Earth Exploration and Information Techniques of Ministry of Education, Chengdu 610059, China..