Patent ID: 7221165

Claim:
A method for determining resistivity anisotropy of a porous sample traversed by at least one layering of different conductivity, the porous sample being initially saturated with a first fluid, including setting the sample in a device comprising an elongate containment cell, with a first semipermeable filter permeable to the first fluid and arranged substantially in contact with a first end of the sample, and means for injecting under pressure a second fluid through a second end of the sample, electrodes applied against the sample allowing application of an electric current and detecting potential differences that appear between application points in response to application of the electrical current, establishing at least one pressure injection for the second fluid and carrying out continuous measurements of variations in complex electrical impedance of the sample at frequencies during a displacement of the first fluid, comprising: a) carrying out measurements of the complex electrical impedance of the sample in a position where layerings are oriented substantially transverse to an electrical field created by applying the electrical current; b) carrying out measurements of the complex electrical impedance of the sample in a position where the layerings are oriented substantially in the direction of an electrical field created by applying the electrical current; and c) determining the resistivity anisotropy.