Method and system for eliminating ghost reflections from ocean b

Details Method and system for eliminating ghost reflections from ocean b Method and system for eliminating ghost reflections from ocean b

1996-04-30

1997-12-09

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Offshore prospecting

367 22, 364421, G01V 138, G01V 124

Patent

active

056967349

ABSTRACT:
A computer system and method for eliminating the effects of ghost reflections from marine seismic survey traces obtained via ocean bottom cables are disclosed. Dual sensors are used in the ocean bottom cables, to obtain both pressure and velocity traces. The disclosed method combines, in a common receiver gather, the corresponding pressure and velocity traces for each source-receiver path using several values of a scalar value that serves as a weighting factor. Conventional corrections and filtering, including spiking deconvolution, are applied to the combined traces, and the combined traces for each value of the scalar are stacked over a limited offset range. Autocorrelation and other spectral techniques may be applied to identify the residuals of the ghost reflections using each of the multiple scalar values; the optimal value may then be selected, for each common receiver gather, as that which has the minimum ghost reflection residuals. The combined traces for each common receiver gather are then used in conventional survey generation.

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Ball et al, 66th Annu. SEG Int. Abts. (Denver) Nov. 10, 1996, vol. 1, pp. 28-31, ACQ1-8.

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