Seismic signal processing method and apparatus

Details Seismic signal processing method and apparatus Seismic signal processing method and apparatus

G - Physics

01

V

G01V 1/32 (2006.01)

Patent

CA 2318224

A method and associated apparatus for generating time slice maps and/or horizon maps, representative of an earth formation that is subject to seismic operation, in response to received seismic data includes the steps of: a) cross correlating a plurality of seismic traces from the data and a corresponding plurality of quadrature traces associated, respectively, with the plurality of seismic traces to obtain a corresponding plurality of cross correlation functions "Q(.tau.)", b) obtaining a plurality of particular values from the plurality of cross correlation functions "Q(.tau.)", and c) assigning the plurality of particular values to a respective plurality of reflection points on a map, each particular value being assigned to a different one of the reflection points, thereby constructing the time slice map. The particular value could be either a quadrature correlation coefficient (QCC), or a time lag (TL), or a sum of a normalized quadrature correlation coefficient and a normalized time lag (QCC n + TL n).

L'invention porte sur un procédé et l'appareil associé de création de cartes de tranches de temps ou de cartes d'horizon représentatives d'une formation terrestre objet d'une investigation sismique en réponse a des données sismiques reçues. Ladite méthode consiste: a) à intercorreler l'ensemble de traces sismiques des données et un ensemble de traces en quadrature associées à l'ensemble des traces sismiques pour obtenir un ensemble correspondant de fonctions intercorrélées Q( tau ); b) à tirer un ensemble de valeurs particulières de l'ensemble des fonctions intercorrélées Q( tau ); et c) à attribuer l'ensemble des valeurs particulières à un ensemble de points de réflexion d'une carte, chacune de ces valeurs particulières étant attribuée à un point différent, ce qui permet de construire la carte de tranches de temps. Une valeur particulière peut être soit un coefficient de corrélation en quadrature (QCC) ou un délai (TL) ou la somme (QCC?n? + TL?n?) d'un coefficient de corrélation en quadrature normalisé et d'un délai normalisé.

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