A method and apparatus for determining the resistivity of a...

G - Physics – 01 – V

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G01V 3/24 (2006.01)

Patent

CA 2367702

The invention relates to a method of surveying the resistivity of a geological formation through which a borehole provided with metal casing passes, in which method a leakage current is caused to leak into said formation outside the casing, and said leakage current is determined on a casing section at a certain level, the leakage current being indicative of the resistivity of the formation. According to a characteristic of the invention, the resistivity is determined on the basis of the leakage current by applying a factor that depends on the distance z between said level and the surface.

L'invention concerne un procédé de détermination de la résistivité d'une formation géologique traversée par un puits revêtu de tubage métallique. On établit un courant de fuite dans la formation, en dehors du tubage, et le courant de fuite est évalué sur une partie du tubage à un certain niveau, ce qui donne une indication de la résistivité de la formation. Selon un aspect de l'invention, la résistivité est déterminée sur la base du courant de fuite, par application d'un facteur qui dépend de la distance <u>z</u> entre le niveau considéré et la surface.

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