Method for measuring the water bottom reflectivity

Details Method for measuring the water bottom reflectivity Method for measuring the water bottom reflectivity

1996-12-31

1998-08-11

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Offshore prospecting

367 21, G01V 138

Patent

active

057937028

ABSTRACT:
The two-way water-layer travel time, .tau., is derived from duel-mode seismic sensor data by cross-correlating the Fourier transforms of the sum and difference of the velocity and pressure signatures. The Z-transform of .tau. evaluates one of the two Backus variables, Z.sub.w. The second variable is R.sub.b, the water bottom reflectivity coefficient. The frequency-domain transforms of the above summed and differenced signatures are each multiplied by the Backus operator (1+R.sub.b Z.sub.w).sup.2 after initializing R.sub.b and the products are iteratively cross-correlated until the correlation function converges to a minimum. R.sub.b is perturbed after each iteration. The value of R.sub.b upon convergence is the local water bottom reflectivity coefficient.

REFERENCES:
patent: 4486865 (1984-12-01), Ruehle
patent: 4796238 (1989-01-01), Bourgeois et al.
patent: 5365492 (1994-11-01), Dragoset, Jr.
patent: 5396472 (1995-03-01), Paffenholz
patent: 5524100 (1996-06-01), Paffenholz
Encyclopedia Dictionary of Exploration Geophysics, Second Edition; Compiled by Robert E. Sheriff; Society of Exploration Geophsicists, 1984; p. 217.

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