Method for producing a composite block from seismic...

G - Physics – 01 – V

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G01V 1/28 (2006.01) G01V 1/30 (2006.01)

Patent

CA 2262414

The invention concerns a method for producing a composite block from seismic recording blocks, characterised in that it consists in: producing independent primary seismic blocks, each seismic block being constructed from seismic data registered along a predetermined acquisition direction, so as to obtain n primary seismic blocks {Ai(x, y, z)} with i varying from 1 to n, n being greater or equal to 2; computing for each point of each primary block Ai a quality criterion value representing the seismic attribute local quality, so as to obtain n quality criterion blocks {Qi(x, y, z)} with i varying from 1 to n, each quality criterion block Qi being associated with the primary block Ai; constructing a composite seismic block C(x, y, z) whereof each sample is computed as a combination of sample values of blocks Ai(x, y, z) weighted by their relative qualities Qi(x, y, z).

Méthode d'élaboration d'un bloc composite à partir de blocs d'enregistrements sismiques. Elle est caractérisée en ce qu'elle consiste à: réaliser des blocs sismiques primaires indépendants, chaque bloc sismique étant construit à partir de données sismiques enregistrées suivant une direction d'acquisition prédéterminée, de manière à obtenir n blocs sismiques primaires {A¿i?(x, y, z)} avec i variant de 1 à n, n étant supérieur ou égal à 2; calculer pour chaque point de chaque bloc primaire A¿i? la valeur d'un critère de qualité représentatif de la qualité locale de l'attribut sismique, de manière à obtenir n blocs de critère de qualité {Q¿i?(x, y, z)} avec i variant de 1 à n, chaque bloc de critère de qualité Q¿i? étant associé au bloc primaire A¿i?; construire un bloc sismique composite C(x, y, z) dont chaque échantillon est calculé comme une combinaison des valeurs des échantillons des blocs (A¿i?(x, y, z) pondérées par leurs qualités relatives Q¿i?(x, y, z).

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