Method and system for surface-consistent phase and time lag corr

Details Method and system for surface-consistent phase and time lag corr Method and system for surface-consistent phase and time lag corr

1995-12-29

1998-06-09

McElheny, Jr., Donald E.

Boots, shoes, and leggings

367 54, G06F 1900

Patent

active

057645167

ABSTRACT:
A computer system and method for correcting seismic data for phase distortion due to the effects of the near-surface layer are disclosed. Phase error corrections are performed on multiple frequency bands, beginning with a primary band and then proceeding with adjacent frequency bands. The primary band phase constant and time lag corrections are derived in a manner in which the phase correction is applied to the correlation function prior to selection of the peak time lag value, improving the accuracy of the time lag decomposition. Corrections for the secondary bands are made in such a way that the phase corrections at a tie frequency within the overlap frequencies between each secondary band and its adjacent bands are forced to be equal. At each step, surface-consistent decomposition of the phase static components and the time lag static components is performed using a weighted least-squares approach. An alternative embodiment performs the method by determining total corrections in each band to minimize the data storage requirements.

REFERENCES:
patent: 4858199 (1989-08-01), Griffith
patent: 5555218 (1996-09-01), Chambers et al.
Taner, et al., "Estimation and Correction of Near-Surface Time Anomalies", Geophysics, vol. 39, No. 4 (Aug. 1974), pp.441-463.
Taner, et al., "Surface consistent corrections", Geophysics, vol. 46, No. 1 (Jan. 1981), pp.17-22.
Cambois, et al., "Surface-consistent phase decomposition in the log/Fourier domain", Geophysics, vol. 58, No. 8 (Aug. 1993), pp.1099-1111.
Claerbout, Three-Dimensional Filtering: Environmental soundings image enhancement, (http://sepwww/sep/prof, Mar. 1995), pp. 55-59.

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