When no direct measurements are available, detailed knowledge of the compressional- and/or shear-wave velocity fields is essential for quantitative estimation of gas hydrate and free gas in bottom-simulating reflectors (BSR). Discrepancies between experimental velocity profiles and the velocity for water-filled sediments reveal the presence of gas hydrate (positive anomalies) and free gas (negative anomalies).
We use the model developed by Carcione and Tinivella (2000), based on a three-phase Biot-type theory, to obtain wave velocities of sediments saturated with water and gas hydrate, and the theory of Santos et al. (1990) to calculate the wave velocities of a porous medium saturated...
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