Method of source coding and harmonic cancellation for vibrationa

Details Method of source coding and harmonic cancellation for vibrationa Method of source coding and harmonic cancellation for vibrationa

1989-10-23

1991-01-01

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 41, G01V 100

Patent

active

049823744

ABSTRACT:
A method is provided for significantly reducing the distortion and crossfeed from any selected order harmonic for any number of vibratory seismic sources operated concurrently, at the same time providing for separation of the signals from the different sources and for improving the signal-to-noise ratio. After determining the highest order harmonic likely to cause distortion, a number of sweeps of each source in each position is selected. This number depends upon the number of sources and the highest order harmonic to be suppressed. Initial phase angles for each sweep of each source are then selected to permit signal separation while suppressing harmonics up to and including that highest order harmonic.

REFERENCES:
patent: 3885225 (1975-05-01), Anstey et al.
patent: 4042910 (1977-08-01), Rietsch
patent: 4168485 (1979-09-01), Payton et al.
patent: 4715020 (1987-12-01), Landrum
patent: 4751687 (1988-06-01), Christensen
patent: 4823326 (1989-04-01), Ward
The Effect of Harmonic Distortion in the Use of Vibratory Surface Sources, Seriff & Kim, Geophysics, 35 234-246 (Apr. 1970).
New Developments in Vibroseis Technology, Schrodt & Kumamoto, Expanded Abstracts with Biographics, 1985 Technical Program, 55th Annual International SEG Meeting, Washington, D.C.
Simultaneous Recording of Several Vibroseis Lines, Garotta, CGG Technical Series No. 531.83.07 (1983).
Reduction of Harmonic Distortion in Vibratory Source Records, Rietsch, Geophysical Prospecting, 1981, 29 178-188.

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