Acoustic signal processing method using array coherency

Details Acoustic signal processing method using array coherency Acoustic signal processing method using array coherency

2005-06-14

2005-06-14

Barlow, John (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Earth science

C367S049000

Reexamination Certificate

active

06907349

ABSTRACT:
A system and method is provided for characterizing earth formations. In one embodiment, the method includes passing a logging tool through a borehole and repeatedly: (a) triggering an acoustic wave generator; (b) recording acoustic waveforms received by receivers in the logging tool; (c) determining a time semblance of the recorded acoustic waveforms; and (d) smoothing the time semblance. In a different embodiment, a phase semblance of the recorded acoustic waveforms is determined and smoothed. The smoothing may be performed using an adaptive wavelet denoising technique or an adaptive moving average filter technique. In each case the average time or frequency spacing between semblance peaks is preferably determined and used to adapt the smoothing operation in a manner that varies with the slowness value s.

REFERENCES:
patent: 4794572 (1988-12-01), Sondergeld et al.
patent: 4803666 (1989-02-01), Alford
patent: 4817061 (1989-03-01), Alford et al.
patent: 4888743 (1989-12-01), Thomsen
patent: 4903244 (1990-02-01), Alford
patent: 4933913 (1990-06-01), Thomsen
patent: 5027332 (1991-06-01), Alford
patent: 5029146 (1991-07-01), Alford
patent: 5136554 (1992-08-01), Thomsen et al.
patent: 5214613 (1993-05-01), Emersoy
patent: 5278805 (1994-01-01), Kimball
patent: 5541890 (1996-07-01), Tang
patent: 5594706 (1997-01-01), Shenoy et al.
patent: 5712829 (1998-01-01), Tang et al.
patent: 5740124 (1998-04-01), Chunduru et al.
patent: 5808963 (1998-09-01), Emersoy
patent: 6023443 (2000-02-01), Dubinsky et al.
patent: 6141622 (2000-10-01), Keller et al.
patent: 6188961 (2001-02-01), Mandal
patent: 6581010 (2003-06-01), Dubinsky et al.
patent: 6661737 (2003-12-01), Wisniewski et al.
patent: 6691036 (2004-02-01), Blanch et al.
patent: 6748329 (2004-06-01), Mandal
patent: 0703349 (1996-03-01), None
Burrascano et al., Seismic Inversion by the Combined Use of Predictive and Semblance Techniques, 1990 IEEE, pp. 1011-1014.
Kimball, Shear Slowness Measurement by Dispersive Processing of the Borehole Flexural Mode, Mar.-Apr. 1998, Geophysics, vol. 63, No. 2, pp. 337-344.
Marfurt et al., 3-D Seismic Attributes Using a Semblance-Based Coherency Algorithm, Jul.-Aug. 1998, Geophysics, vol. 63, No. 4, pp. 1150-1165.
Kimball et al., Semblance Processing of Borehole Acoustic Array Data, Mar. 1984, Geophysics, vol. 49, No. 3, pp. 274-281.
Kozak et al., Estimation of Formation Shear Slowness Using Phase Velocity and Semblance Method-Comparative Studies, Apr. 22, 2002, (published on WorldWideWeb: www.magneticpulse.com/pdf/MPI_SEG2001.PDF).
Alain Brie, et al; New Directions in Sonic Logging; Spring 1998; (pp. 40-55); Oilfield Review.
Chung Chang, et al; Localized Maps of the Subsurface; Spring 1998; (pp. 56-66); Oilfield Review.
G. Brewton; The Geology of the Skinner, Bartlesville and Misener Sandstones in Well DM21A at Catoosa; Nov. 1996; Amoco Corporation.
B. A. Auld; Acoustic Fields and Waves in Solids; Feb. 1994 (pp. 68-87); (pp. 163-189); (pp. 191-263); (pp. 367-383); (pp. 383-409); (pp. 411-423); (pp. 1-61); (pp. 63-133); (pp. 375-414); (pp. 397-414); A Wiley-Interscience Publication.
C. Esmersoy; Dipole Shear Anistropy Logging; 1994; (pp. 1138-1142); Expanded Abstracts of 64th Annual Meeting, SEG.
N. Cheng, C. H. Cheng; Borehole Geophysics 1: Well Logging; 1995; (pp. 1-4); Expanded Abstracts of 64th Annual Meeting, SEG.
International Search Report Dated Jun. 20, 2000; (4 p.).
J. E. White, Underground Sound, Application of Seismic Waves, Methods in Geochemistry and Geophysics, 18, Elsevier, 1983, pp. 20-35 and 162-193.
D. P. Schmitt et al., Full-Wave Acoustic Logging: Synthetic Microseismograms and frequency-wavenumber analysis, Geophyics, vol. 50, No. 11, Nov. 1985, pp. 1756-1778.
Joakim O. Blanch et al., Processing for Sonic Waveforms, U.S. Appl. No. 09/547,304, filed Apr. 11, 2000.

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