Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1988-10-19
1989-08-01
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367 39, 364421, 364819, G01V 128, G01V 136
Patent
active
048539031
ABSTRACT:
Method and apparatus for removing sinusoidal noise from seismic traces comprised of a seismic data component and a sinusoidal noise component. Seismic traces acquired by conventional seismic exploration of a subsurface formation are utilized to produce a frequency domain amplitude spectrum of the traces. The amplitude spectrum is analyzed to determine a line frequency equivalent to the sinusoidal noise frequency to be removed. A filter order N (number of filter weights) is selected and the exact autocorrelation function of the selected sinusoidal frequency is determined for lags 0, 1, . . . , N-1. An autocorrelation matrix is produced utilizing the determined autocorrelation values and predictive deconvolution techniques are applied to the autocorrelation matrix to produce a convolutional filter which will remove sinusoidal noise at the determined frequency while leaving other frequencies minimally attenuated. The sinusoidal noise is then removed from the seismic data by convolving the acquired seismic traces with the filter.
REFERENCES:
patent: 4104611 (1978-08-01), Kalden
patent: 4561074 (1985-12-01), Warmack
patent: 4780859 (1988-10-01), Hadidi et al.
Ohmuro et al., "An Adaptive Digital Filter as a Sinusoidal Noise Canceller", Trans. Inst. Electron. & Commun. Eng. Jpn., Sect. B, vol. B 64, #9, p. 619, 9/81.
Gastev et al., "The Stability of an Autocompensator for Sinusoidal Interference", 4/86, Radiotekhnika Moshua, vol. 41, #4, pp. 37-39.
Griffith Paul G.
Linville, Jr. Andrew F.
Shirley Thomas E.
Hager Jr. George W.
McKillop Alexander J.
Mobil Oil Corporation
Moskowitz Nelson
Speciale Charles J.
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