System for permeability logging by measuring streaming...

Details System for permeability logging by measuring streaming... System for permeability logging by measuring streaming...

G - Physics

01

V

324/10

G01V 3/20 (2006.01) G01V 3/26 (2006.01)

Patent

CA 1178658

SYSTEM FOR PERMEABILITY LOGGING BY MEASURING STREAMING POTENTIALS ABSTRACT Method and apparatus for investigating earth formations according to the present invention include positioning an opening of a fluid reservoir in contact with the surface of a earth formation to he investigated and injecting the fluid at high pressures through the opening into the formation at frequencies within a range up to 1 khz to cause quasi-static flow in the formation. Streaming potentials generated in the formation by this flow are detected by appropriate electrodes and the output of the electrodes, representative of the generated potentials, is then processed to determine a characteristic response time of these streaming potentials. Thereafter, from a knowledge of the characteristic response time of the detected streaming potentials a measurement of the permeability of the formation is derived.

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