Patent ID: 7148693

Claim:
A process of geophysical prospecting of a porous geological formation containing at least one electrolytic fluid based on electro-kinetic or electro-osmotic coupling effects, comprising the steps of: stimulating a region of interest of the formation where the at least one electrolytic fluid is found with an excitation signal corresponding to an energy of a first type in such a way that the excitation signal is converted in the region of interest into a response signal corresponding to an energy of a second type, detecting of the response signal, applying an electric polarisation to the region of interest so as to strengthen the response signal relative to what it would be in the absence of the electric polarisation of the region of interest, wherein the electric polarisation comes about by means of a continuous or quasi-continuous polarising electric field, the excitation signal has an excitation frequency, and the polarising electric field is modulated in frequency with a frequency which is low relatively to the excitation frequency.