1. School of Science, Qingdao University of Technology 1 , Qingdao 266520, China
2. Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology 2 , Qingdao 266237, China
3. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology 3 , Qingdao 266237, China
4. School of Civil Engineering, Qingdao University of Technology 4 , Qingdao 266520, China