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| | Abstract | | It has been observed that existing of methane hydrates attenuate elastic wave in seismic exploration. But the mechanism of attenuation is not well understood. We conducted an acoustic pulse transmission experiment in partially frozen brine to understand how waves were attenuated through a solid-liquid coexistence system. At the same time, we used NMR to estimate the total amount of frozen brine at each temperature. Finally, we obtained a high correlation between attenuation of acoustic pulse and an amount of unfrozen brine. Our experimental results indicate that acoustic waves are significantly affected by the existence of unfrozen brines. Also, we investigated the effect of spectral leakage by applying different window functions. |
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