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A PRELIMINARY STUDY OF GAS HYDRATES IN ADJACENT REGION OF ODP184SITE 1144ON NORTH MARGIN OF SOUTH CHINA SEA
Song Haibin1，2 Geng Jianhua2
（1.Institute of Geology and Geophysics，CAS，Beijing 100029，China；2.Key Lab of Marine Geology，Tongji University，Shanghai 200092，China）
Abstract：Seismic，sonic logging and geothermal data are analyzed for possible existence of gas hydrates in adjacent region of ODP184site 1144on north margin of South China Sea.Bottom simulating reflectors（BSR）and amplitude blanking zone are discovered in seismic profiles.The BSR depth is compared with thickness of gas hydrates stability zone from thermal gradient data.The BSR at ODP site 1144is deep，which is 654meters below sea floor.The top of amplitude blanking zone may be related with that of gas hydrates-bearing strata in adjacent region of ODP site 1154，which is about 450meters below sea floor.
Key Words：Gas hydrates；North of South China Sea；Bottom simulating reflectors；Amplitude blanking zone；Temperature pressure condition