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Identification and quantification of gas-hydrate and free-gas reservoirs in unconsolidated sediments using seismic data are important, because seismic methods are the most promising remote sensing technique for the delineation of such prospects. For many years, the seismic method has been used to detect free-gas reservoirs because of their association with high-amplitude events and a characteristic amplitude relative to offset behavior. However, seismic-data-driven analysis for detecting and quantifying gas-hydrate accumulations is uncommon. Gas hydrate in the pore space increases elastic velocities and reduces the bulk density. Because of these properties, coupled with the fact that gas hydrate tends to be...

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