Method and apparatus for measuring the resistivity of earth...

Details Method and apparatus for measuring the resistivity of earth... Method and apparatus for measuring the resistivity of earth...

G - Physics

01

V

324/10

G01V 3/20 (2006.01)

Patent

CA 2009562

The invention relates to a logging method and apparatus for determining the electrical resistivity of an earth formation traversed by a borehole (11). The resistivity is determined using a measuring pad (20) which has a central electrode (A0b) operable to deliver a measuring current. The measuring current is focused radially by means of two focusing systems: an active focusing system (M, A1) which focuses the measuring current in a first direction; and a passive focusing system (A0) which focuses the measuring current in a second direction perpendicular to said first direction.

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