Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Offshore prospecting
Patent
1993-08-04
1994-11-15
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Offshore prospecting
367 24, 181110, G01V 138
Patent
active
053654927
ABSTRACT:
A method for reducing the effects of reverberation on noisy seismic wavefields recorded from within a moisture-laden environment. The wavefield manifests itself as a pressure signature and a velocity signature that contains an embedded nose signature. The pressure signature is adaptively filtered and subtractively combined with the velocity signature to isolate a nearly pure noise signature. The nearly pure noise signature is added back to the original velocity signature with opposite sign to clear away the embedded noise, leaving a refined velocity signature. The refined velocity signature iteratively is scaled and summed with the pressure signature, incrementing the scale factor at each iteration and autocorrelating the sum. A coefficient of convergence is calculated after each summation. The coefficient of convergence that most closely approaches unity identifies the preferred scale factor.
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Widrow, B., Glover, J. R., McCool, J. M. Kaunitz, J., Williams, C. S., Hearn, R. H., Zeidler, J. R., Dong, E., Goodlin, R. C. "Adaptive Noise Cancelling: Principles and Applications", Proceedings of the IEEE, vol. 63, No. 12, Dec. 1975.
Eldred J. Woodrow
Knox William A.
Western Atlas International Inc.
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