Forming a geological model

G - Physics – 01 – V

Patent

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

Patent

CA 2705505

A method is provided for forming a geological model of a region of the earth. Seismic data are obtained from the region and include seismic traveltime uncertainty. A seismic velocity model of the region is also provided and includes velocity uncertainty. Ray tracing is performed on the seismic data using the velocity model to determine the three dimensional positions of a plurality of points of the region. The three dimensional positional uncertainties (7-12) of at least some of the points are calculated from the traveltime uncertainty, the velocity uncertainty, and uncertainty in the ray propagation direction. This is combined with the positions determined by the ray tracing to form a geological model.

L'invention porte sur un procédé pour former un modèle géologique d'une région de la terre. Des données sismiques sont obtenues dans la région et comprennent une incertitude de temps de parcours sismique. Un modèle de vitesse sismique de la région est également fourni et comprend une incertitude de vitesse. Un lancer de rayon est effectué sur les données sismiques à l'aide du modèle de vitesse pour déterminer les positions tridimensionnelles d'une pluralité de points de la région. Les incertitudes de position tridimensionnelle (7-12) d'au moins certains des point sont calculées à partir de l'incertitude de temps de parcours, de l'incertitude de vitesse et de l'incertitude dans la direction de propagation de rayon puis combinées aux positions déterminées par le lancer de rayon pour former un modèle géologique.

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