A method of seismic processing of the type comprising depth...

G - Physics – 01 – V

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G01V 1/28 (2006.01)

Patent

CA 2654184

A seismic processing method of the migration type, comprising the steps of : ~ linearly combining downgoing waves generated at a plurality of shotpoints, and also upgoing waves recorded by a plurality of seismic sensors; ~ notionally propagating the composite waves as obtained in this way in order to obtain migrated downgoing and upgoing waves for different depths; and ~ determining at a plurality of depths at least one characteristic of the subsoil as a function of the upgoing and downgoing waves propagated in this way; the downgoing (resp. upgoing) composite waves being calculated by a linear combination of downgoing (resp. upgoing) waves in which said downgoing (resp. upgoing) waves are weighted by the coefficients of a spatial modulation matrix which is a function of the positions of the shotpoints.

La présente invention concerne un procédé de traitement de données sismiques du type à migration, qui comprend les étapes consistant à : combiner linéairement des ondes descendantes produites en une pluralité de points de tir, et aussi des ondes ascendantes enregistrées par une pluralité de capteurs sismiques ; faire une propagation notionnelle des ondes composites obtenues de cette manière afin d'obtenir des ondes descendantes et ascendantes migrées pour différentes profondeurs ; et déterminer en une pluralité de profondeurs au moins une caractéristique du sous-sol en tant qu'une fonction des ondes ascendantes et descendantes propagées de cette manière ; les ondes composites descendantes (respectivement ascendantes) étant calculées par une combinaison linéaire de vagues descendantes (respectivement ascendantes) dans laquelle lesdites ondes descendantes (respectivement ascendantes) sont pondérées par les coefficients d'une matrice de modulation spatiale qui est une fonction des positions des points de tir.

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