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GEOPHYSICAL RESEARCHES ON MARINE GAS HYDRATES（I）：PHYSICAL PROPERTIES
SONG Haibin1，2 MATSUBAYASHI Osamu2 WU Nengyou3 HAO Tianyao1
（1.Institute of Geology and Geophysics，CAS，Beijing 100029，China；2.Geological Survey of Japan，Tsukuba 3058567，Japan；3.Institute of Marine Geology，Guangzhou Marine Geological Survey，Guangzhou 510760，China）
Abstract：Physical properties of hydrate-bearing sediments are reviewed and the relationships between physical properties and gas hydrate concentration are discussed.There are some simple models such as porosity-reduction，time-average equation and weighted time-average and Wood's equation and complex models such as elastic moduli model and those based on seismic wave propagation in effective medium.Resistivity and thermal conductivity models of hydrate-bearing sediments are also introduced，and physical properties of gas-bearing sediments are also presented.
Keywords：Gas hydrates；Physical properties；concentration
