Seismic data acquisition and method for spatially filtering...

G - Physics – 01 – V

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G01V 1/36 (2006.01)

Patent

CA 2333069

A method of acquiring and processing seismic data involving deploying a number of seismic sensors, actuating a seismic source, receiving seismic signals produced by the seismic source using the seismic sensors, calculating offset distances (44) between the seismic source and the seismic sensors, and (42) producing spatially filtered seismic data from the received seismic signals. The inventive method may be used effectively with receiver arrays having smaller areal footprints and fewer sensors per receiver station location than conventional seismic data acquisition systems. It also allows ground roll and random noise to be effectively attenuated as the seismic data is spatially resampled or prepared for spatial resampling.

La présente invention concerne un procédé d'acquisition et de traitement de données sismiques impliquant le déploiement de géophones, la mise en oeuvre d'une source sismique, la réception au moyen des géophones des signaux sismiques produits par la source sismique, le calcul des distances d'écart (44) entre la source sismique et les géophones, et enfin la production (42) des données sismiques tridimensionnellement filtrées à partir des signaux sismiques reçus. Le procédé de l'invention convient effectivement dans le cas de chapelets de géophones se caractérisant par une moins grande superficie des empreintes et par un nombre moindre de géophones par position de station de réception que dans le cas des systèmes conventionnels d'acquisition de données sismiques. Le rééchantillonnage tridimensionnel des données sismiques ou leur préparation en vue du rééchantillonnage tridimensionnel font que ce système se prête particulièrement à une atténuation notable des ondes parasites de surface (ground-roll) et du bruit aléatoire.

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