Detection of subsurface resistivity contrasts with...

G - Physics – 01 – V

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G01V 3/02 (2006.01)

Patent

CA 2452215

The invention relates to a method of mapping subsurface resistivity contrasts by making multichannel transient electromagnetic (MTEM) measurements on or near the earth's surface using at least one source, receiving means for measuring the system response and at least one receiver for measuring the resultant earth response. All signals from the or each source-receiver pair are processed to recover the corresponding electromagnetic impulse response of the earth and such impulse responses, or any transformation of such impulse responses, are displayed to create a subsurface representation of resistivity contrasts. The invention enables subsurface fluid deposits to be located and identified and the movement of such fluids to be monitored.

L'invention concerne un procédé de mappage des contrastes de résistivité souterrains consistant à effectuer des mesures électromagnétiques transitoires multi-canaux (MTEM) sur la surface du sol, ou à proximité de celle-ci, au moyen d'une source, d'un dispositif de réception pour mesurer la réponse du système et d'au moins un récepteur pour mesurer la réponse du sol obtenue. Tous les signaux émis par la paire récepteur-source, ou chaque paire récepteur-source, sont traités pour obtenir la réponse impulsionnelle électromagnétique correspondante du sol ; ces réponses impulsionnelles, ou toute transformation de ces réponses impulsionnelles, étant affichées pour créer une représentation souterraine des contrastes de résistivité. Par ailleurs, l'invention permet de localiser et d'identifier les dépôts de fluides souterrains et de surveiller leurs déplacements.

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