1. Key Laboratory of Gas Hydrate, Guangzhou Institute of
Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, P. R. China
2. Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, P. R. China
3. Guangdong Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, P. R. China
4. University of Chinese Academy of Sciences, Beijing 100083, P. R. China