G - Physics – 01 – V
Patent
G - Physics
01
V
349/17
G01V 1/36 (2006.01)
Patent
CA 1229678
METHOD AND APPARATUS FOR OBTAINING A COMPOSITE FIELD RESPONSE TO A VARIABLE SOURCE ARRAY USING WEIGHTING COEFFICIENTS ABSTRACT OF THE DISCLOSURE A multi-channeled digital seismic field stacking system is disclosed for obtaining the composite response to a vari- able source array. A variable source array is synthesized by applying preselected weighting coefficients to the seismic signals produced in response to a selected number of surface energy impulses. The seismic signals produced by these impulses are amplified, multiplexed and digitized to obtain digital samples to which are applied the weighting coeffi- cients. A digital multiplier is used to multiply each digital sample by a weighting coefficient to obtain a weighted digital sample. Each digital sample is multiplied by two weighting coefficients, a partial and a final. The partial weighted samples from each of the impulses are summed together to form a partial stack, while the final weighted samples are summed together to form a final stack. The variable source array which is synthesized covers two station intervals. At each station, the partial stack represents the first half of a variable source array, while the final stack represents a complete source array covering the two previous station intervals. At each station, the final stack is recorded on magnetic tape as a seismic field record, and the partial stack is transferred to the final stack for summation with the final weighted samples for the last half of the next variable source array.
335245
Khan Tawassul A.
Kiowski John W.
Lang Douglas G.
Geosource Inc.
Meredith & Finlayson
LandOfFree
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