Inversion of 4d seismic data

G - Physics – 01 – V

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G01V 1/40 (2006.01) E21B 47/00 (2006.01)

Patent

CA 2684680

The invention is a method for inferring the saturation and pressure change of a reservoir by combining the information from 4D (time-lapse) seismic and time lag data volumes (7) derived from the 4D seismic, well logs (4), and reservoir simulation results (when simulator results are available) and featuring one or more 4D well ties (1) for a quantitative 4D interpretation. The inventive method uses model-based inversion incorporating rock physics (2) at well locations (5), and is statistical-based (6) away from wells. The method thus allows integration (8) of rock physics model and reservoir simulation and honors 4D seismic change.

L'invention porte sur une méthode permettant de déduire la saturation et les variations de pression d'un réservoir en combinant les informations de volumes de données sismiques 4D (intervalle de temps) et de volumes de données de temporisation (7) extraites de diagraphies de puits sismiques 4D (4) et des résultats de simulation du réservoir (si disponibles) et caractérisant un ou plusieurs liens de puits (1) pour une interprétation quantitative en 4D. La méthode de l'invention utilise l'inversion à base de modèle incorporant la physique de la roche (2) aux emplacements (5) des puits, et est établie sur une base statistique à distance des puits. La méthode permet donc l'intégration (8) d'un modèle de la physique de la roche, et d'une simulation du réservoir et tient compte des variations sismiques 4D.

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