G - Physics – 01 – V
Patent
G - Physics
01
V
G01V 1/36 (2006.01) G01V 1/30 (2006.01)
Patent
CA 2224868
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.
Méthode pour la détermination des vitesses de migration dans un traitement sismique. Elle est du type consistant à utiliser un point de tir (S) associé à des récepteurs (R¿1? à R¿n?) qui sont séparés par des déports et elle est caractérisée en ce qu'on migre dans un champ de vitesses donné un premier ensemble de traces issues du point de tir et enregistrées sur les récepteurs et un deuxième ensemble de traces à déport constant et colinéaire audit premier ensemble, de manière à obtenir deux images migrées de la partie du milieu correspondant auxdits ensembles de traces, et on corrèle les deux images migrées au moyen d'une corrélation spatiale bidimensionnelle dont le résultat détermine l'écart entre la vitesse de migration utilisée et la vitesse recherchée. Application notamment à la prospection sismique d'un milieu.
Elf Aquitaine Production
Swabey Ogilvy Renault
LandOfFree
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