Method for improving the accuracy of ocean bottom reflectivity e

Details Method for improving the accuracy of ocean bottom reflectivity e Method for improving the accuracy of ocean bottom reflectivity e

1998-05-13

1999-10-05

Barlow, John

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Offshore prospecting

367 46, 367 24, 367 21, 367 15, 367 38, 181110, G01V 138

Patent

active

059635070

ABSTRACT:
A method for determining ocean bottom reflectivities from dual sensor seismic data, whereby a first time windowed pressure signal and a first windowed velocity signal are summed to generate a first summed signal, and a second time windowed pressure signal and a second time windowed velocity signal are summed to generate a second summed signal. The first summed signal and the second summed signal are transformed from the time domain to the frequency domain to generate a first transformed sum and a second transformed sum, respectively. A value R for said ocean bottom reflectivity is selected and used to calculate an inverse Backus filter (1+Rz).sup.2, where Z is the Z-transform of the two-way travel time delay filter. The first transformed sum and the second transformed sum are multiplied by the inverse Backus filter to generate a first filtered sum and a second filtered sum, respectively. A cross spectrum is calculated from the first filtered sum and the second filtered sum to generate a trial cross spectrum. An optimization algorithm is applied to the trial cross spectrum to determine the ocean bottom reflectivity.

REFERENCES:
patent: 5396472 (1995-03-01), Paffenholz
patent: 5524100 (1996-06-01), Paffenholz

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