In this study, we provided a theoretical tool for estimating the amount of hydrate and gas from surface seismic. We develop rock-physics models that link the elastic wave velocity in high-porosity marine sediment to density, porosity, effective pressure, mineralogy, and water/gas and hydrate saturation of the pore space. Three micromechanical models of hydrate deposition in the pore space were examined: (1) hydrate is part of the pore fluid, (2), hydrate becomes part of the solid frame, and (3) hydrate cements grain contacts thus strongly reinforcing the sediment. Using interval velocities from the Blake Outer Ridge, we calculate lateral maps of hydrate and gas saturations. We find that the maximum hydrate saturation for model 1 is between 18% and 33%, for model 2 between 16% and 24% and for model 3 less than 1%. Gas saturation is approximately 2%. Those saturation estimates are consistent with results obtained using known velocities and porosities from wells 994 and 995 in this region. Using AVO analysis and comparison of the synthetic results with the real seismic suggest that only model 1 or 2 can reproduce the seismic data. Those two are, however, not distinguishable by means of seismic and more information is necessary to be able to separate them . Consequently we conclude that the maximum hydrate saturation at the Blake Outer Ridge region investigated in this study is somewhere between 15% and 33% of the pore space.