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GEOPHYSICAL RESEARCHES ON MARINE GAS HYDRATES（Ⅲ）：BOTTOM SIMULATING REFLECTIONS
SONG Haibin ZHANG Ling JIANG Weiwei HAO Tianyao
（Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029，China）
Abstract：To promote seismic researches on gas hydrate，some viewpoints are discussed about bottom simulating reflections（BSRs）.More than 30years'researches on BSRs show that BSRs are still one of the best indicators of presence of gas hydrate-bearing sediments.If BSRs are found，gas hydrates can be considered to exist.There are two velocity models；one is free gas zone model and the other hydrate wedge model.But BSRs are primarily caused by free gas beneath the base of gas hydrate stability zone（BGHS）.Gas hydrates above BSRs and free gas beneath BSRs are related with gas recycling and methane-bearing fluid flux.Due to the difficulty to exactly determine in site controlling factors about gas hydrate stability zone calculation and others，BSRs are approximately corresponding to the BGHS.The relationships between gas hydrate gas system and BSRs should be studied from viewpoints of dynamic evolution.
Keywords：gas hydrates；seismic methods；bottom simulating reflections；free gas；stability zone
【注释】
[1]1atm=101.325kPa
[2]1atm=101.325kPa
