Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Offshore prospecting
Patent
1997-06-09
2000-02-01
Oda, Christine K.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Offshore prospecting
367 21, G01V 138
Patent
active
060210923
ABSTRACT:
A method for determining water bottom reflectivities whereby pressure signals and velocity signals are combined to generate combined signals having signal components representing downwardly-travelling energy substantially removed. The pressure and velocity signals correspond to seismic waves generated at source locations n in a water layer and detected by co-located pressure and velocity receivers at receiver locations m in the water layer. The combined signals correspond to each pairing of source location n and receiver location m. The combined signals are transformed from the time domain to the frequency domain, generating transformed signals. A source peg-leg term and a receiver peg-leg term is calculated for each transformed signal, generating filtered signals. An optimization algorithm is applied to the filtered signals, using the corresponding source and receiver peg-leg terms to determine the water bottom reflectivity values R.sub.n and R.sub.m at the source locations n and the receiver locations m, respectively.
REFERENCES:
patent: 5173879 (1992-12-01), Cung et al.
patent: 5396472 (1995-03-01), Paffenholz
patent: 5524100 (1996-06-01), Paffnerholz
patent: 5625150 (1997-04-01), Greene et al.
Barr Frederick J.
Chambers Ronald E.
Paffenholz Josef
Jolly Anthony
Lester Gerald E.
Oda Christine K.
Western Atlas International Inc.
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