| 摘要 |
The invention discloses a method for the determination of migration velocities in seismic processing. It is of the type which consists in using a blasting point S associated with receivers (R1 to Rn) which are separated by offsets and it is characterised in that in a given speed range a first set of traces derived from the blasting point and registered on the receivers and a second set of traces in constant and colinear offset to the first set are migrated, so as to obtain two migrated images of the part of the site corresponding to the said two sets of traces, and the two images are correlated by means of a spatial two-dimensional correlation, the result thereof determining the deviation between the migration used and the investigated velocity. It is particularly useful in the seismic prospection of a site.
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