1. School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, P. R. China
2. The Yangtze Delta Region Institute (Quzhou), University of Electronic Science and Technology of China, Quzhou, Zhejiang 324000, P. R. China
3. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610000, P. R. China