Stable estimates for angle-dependent acoustic impedance are obtained from a dual wavefield data set that consists of pressure and vertical particle velocity measurements. Using these acoustic impedance estimates, a nonlocal inversion procedure predicts sediment material impedance, interval velocity, density, and their associated relative errors as a function of depth. The method is successfully applied to data from a marine seismic experiment conducted by Halliburton Geophysical Services in the Gulf of Mexico in 1989. The inverted values for the seafloor sediment density and interval velocity lie close to those obtained independently by other methods, implying that the inversion illustrated is valid for use with field data.

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