Research on Pressure Tight Sampling Technique of Deep-Sea Shallow Sediment-A New Approach to Gas Hydrate Investigation

1 .IntroductionRecent researches have revealed that the geochemical method is an efficient way to indicate theoccurrence of gas hydrate within marine sediments .Accordingtosediment and pore water samples col-lectedfromODPor DSDPdrill cores ,a series of ge…