Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology;
Ministry of Land and Resources;
Qingdao Institute of Marine Geology;
Qingdao 266071;
P. R. China;
Laboratory for Marine Mineral Resources;
Qingdao National Laboratory for Marine Science and Technology;
Qingdao 266071;
P. R. China;
College of Marine Geo-Science;
Ocean University of China;
Qingdao 266100;
P. R. China;
Geo-Engineering Investigation Institute of Xiamen;
Xiamen 361008;
P. R. China;