| 摘要 |
PCT No. PCT/FR92/00257 Sec. 371 Date Feb. 16, 1993 Sec. 102(e) Date Feb. 16, 1993 PCT Filed Mar. 20, 1992 PCT Pub. No. WO92/18883 PCT Pub. Date Oct. 29, 1992.A method and device for obtaining a zero-offset seismic section from a stack seismic section produced from stack traces recorded along a given line of survey, is disclosed. The present method and device is directed to determining an interval velocity macro-model which defines a number of reflectors along the line of survey as a function of depth; calculating from the macro-model, travel times for each of the seismic traces of each of CMP gathers and each of the reflectors of the macro-model; defining for each of the CMP gathers, as many primary indicatrices as there are reflectors in the macro-model; calculating between the primary indicatrices associated with each of the CMP gathers, as many interpolated indicatrices as there are samples over the stack trace corresponding to a given CMP gather; and stacking the seismic traces of each of the CMP gathers along the indicatrices associated with the given CMP gather, so as to produce a set of stack seismic traces obtained for all the CMP gathers constituting the zero-offset seismic section along the given line of survey.
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