1. Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou, P. R. China
2. Gas Hydrate Engineering Technology Center, China Geological Survey, Guangzhou, P. R. China
3. School of Energy Resources, China University of Geosciences (Beijing), Beijing, P. R. China
4. School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, P. R. China