Phase discrimination for micro electrical measurement in...

G - Physics – 01 – V

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G01V 3/24 (2006.01)

Patent

CA 2482807

A method for electrically investigating a wall of a borehole in a geologic formation including injecting a current into the formation at a first position along the wall and returning the current at a second position along the wall, the formation current having a frequency below about 100 kHz, measuring a voltage in the formation between a third position and a fourth position along the wall, the third and fourth positions being located between the first and second positions, and determining an amplitude of a component of the voltage in phase with the current.

L'invention porte sur un procédé visant à examiner électriquement une paroi d'un trou de forage dans une formation géologique et consistant à injecter un courant dans la formation au niveau d'une première position le long de la paroi et à renvoyer le courant au niveau d'une deuxième position le long de la paroi, le courant dans la formation ayant une fréquence inférieure à environ 100 kHz, mesurer une tension dans la formation entre une troisième position et une quatrième position le long de la paroi, les troisième et quatrième positions étant situées entre les première et deuxième positions, et déterminer une amplitude d'une composante de la tension en phase avec le courant.

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