The Key Laboratory of Gas Hydrate;
Ministry of Natural Resources;
Qingdao Institute of Marine Geology;
Qingdao 266071;
China;
Laboratory for Marine Mineral Resources;
Qingdao National Laboratory for Marine Science and Technology;
Qingdao 266071;
China;
Qingdao Geological Engineering Survey Court;
Qingdao 266100;
China;
natural gas hydrate; methane gas; acoustic properties; wave velocity model; simulation experiment;