Vector 3-component 3-dimensional kirchhoff prestack migration

G - Physics – 01 – V

Patent

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G01V 1/28 (2006.01)

Patent

CA 2544254

An apparatus and a method for migration of three components, 3-Dimensions seismic (3-C, 3-D) data acquired by down-hole receivers and surface seismic sources. This method utilizes full 3 components reflection wave field. It uses a dynamic, vector energy mapping method to image a reflection position and maps each time sample only to its reflected image point. Therefore, this method reduces unwanted data smearing and false mirror images. This method overcomes the weakness of using only a single component trace or pre-rotated three-component traces in the 1-C or 3-C 3-D VSP migration and produces better 3-D image.

L'invention concerne un appareil et un procédé destinés à la migration de données sismiques à trois composants et tridimensionnelles (3-C, 3-D) acquises au moyen de récepteurs fond de trou et de sources sismiques de surface. Le procédé consiste à mettre en oeuvre l'ensemble d'un champ d'ondes de réflexion à trois composants, ainsi qu'un procédé dynamique d'acheminement d'énergique vectoriel, aux fins d'imagerie d'une position de réflexion, et à acheminer chaque échantillon temporel uniquement vers le point d'image réfléchi de celui-ci. Par conséquent, le procédé permet de réduire la persistance de données non souhaitées et des images-miroir fausses. Le procédé permet de contourner la faiblesse de l'utilisation unique d'une trace à composant unique ou de traces à trois composants soumises à une rotation au préalable dans la migration 1-C ou 3-C 3-D VSP et permet d'obtenir une meilleure image 3-D.

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