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| | Abstract | | Previous studies have shown that the presence of methane hydrates causes high S-wave attenuation at sonic logging frequencies. However, the very limited measurements for S-wave attenuation at seismic frequencies showed no significant S-wave attenuation, which implies frequency-dependent S-wave attenuation in MH-bearing sediments. In order to clarify the mechanisms responsible for such attenuation, we apply rock physics models to predict S-wave attenuation at broadband frequencies. We infer that both the Biot mechanism and friction between hydrate and sand grains dominate S-wave attenuation at seismic frequencies, whereas friction alone is dominant at sonic logging frequencies. |
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