上濟充通大学 Shanghai Jiao Tong University Stability Temperature C 0 2 4 68 1012 14 16 0 100 200 Free gas and water 300 400 Temperature A 500 600 700 Seafloor 800 Geothermal 900 gradient 1000 BSR 1100 Gas hydrate and water 1200Shanghai Jiao Tong University Stability Temperature Geothermal gradient Free gas and water Gas hydrate and water B A