1. 1Key Laboratory of Marine Mineral Resources, Ministry of Natural Resources, Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou, China
2. 2National Engineering Research Center for Gas Hydrate Exploration and Development, Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou, China
3. 3CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
4. 4Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, China
5. 5University of Chinese Academy of Sciences, Beijing, China
6. 6Now at, Guangxi Minzu University, Nanning, China