1. National Engineering Research Center of Gas Hydrate Exploration and Development, Guangzhou Marine Geological Survey, Guangzhou 510075, Guangdong, China
2. College of Safety and Ocean Engineering, China University of Petroleum, Beijing 102249, P. R. China
3. Research Institute of Petroleum Exploration and Development, Beijing 100083, PetroChina
4. College of Petroleum Engineering, China University of Petroleum, Beijing 102249, P. R. China
5. State Key Laboratory of Natural Gas Hydrate, China University of Petroleum, Beijing 102249, P. R. China