Abstract:Gas hydrate may be characterized qualitatively,semi-quantitatively,and even quantitatively using seismic data; but how to realize quantitative prediction in an undrilled prospect is a hard nut to crack.Forward modeling is a solution to this problem.Our case study focuses on a prospect in the South China Sea.The area with plausible gas hydrate is sited using several seismic attributes.The velocity and density of the sedimentary layer,after calibration using ocean drilling program (ODP) data,are then used for forward modeling to generate synthetic seismogram highly correlated with observed seismic data.After pre-stack elastic inversion,we predict hydrate distribution and its petrophysical properties in terms of the relation between hydrate saturation and P-impedance.Our work provides information for the estimation of gas hydrate reserves.
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