Monitoring a region of interest in a subsurface formation

G - Physics – 01 – V

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G01V 1/30 (2006.01)

Patent

CA 2695137

A method of monitoring a subsurface formation including a region of interest below a surface region, which method comprises the steps of exciting seismic interface waves in the surface region over an area of the earth's surface at a first and a second moment in time; detecting seismic interface waves signals for a plurality of locations in the area; determining, from the detected seismic interface wave signals, an areal distribution of a parameter related to seismic interface wave velocity change between the first and second moments in time; and inferring, from the areal distribution, an indication of a volume change of the region of interest between the first and second moments in time.

L'invention concerne un procédé de surveillance d'une formation souterraine renfermant une zone d'intérêt située sous une zone superficielle. Ce procédé consiste à exciter des ondes interfaciales sismiques dans la zone superficielle sur une zone de la surface terrestre à un premier et à un second point dans le temps, à détecter des signaux d'ondes interfaciales sismiques pour une pluralité d'emplacements dans la zone, à déterminer, à partir des signaux d'ondes interfaciales sismiques détectés, une distribution aréale d'un paramètre associé à un changement de vitesse d'ondes interfaciales sismiques entre lesdits premier et second points dans le temps, et à déduire, à partir de cette distribution aréale, une indication d'un changement de volume de la zone d'intérêt entre lesdits premier et second points dans le temps.

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