Geothermal energy is a key for the future. The understanding rock proprieties are necessary for a potential exploitation and apprehend field measurements. Here, we are interested by electrical conductivity of porous rocks.

We conducted all experiment under temperature and pressure in Paterson Press and we measured the resistance of sample with impedance spectrometer. So here, it is in-situ measurements.

Two different set-ups are explored. One on rock core with inner and outer electrode of copper. It is a coaxial geometry for dry and saturated sample with NaCl solution, and we measured the electrical conductivity at one pressure and different temperature. We stopped experiment if there was a leak. The second protocol is rock core with an electrode on top and bottom of the sample. The bottom is a stainless steel fritter piece to permit the fluid injection under temperature and pressure. Here we measured electrical conductivity with constant fluid pressure.

Many information, like porosity or permeability, are probed. Preliminary works show electrical conductivity measurements under pressure and temperature on porous sample hydrated by NaCl solution by impregnation or fluid injection. It is a first step to reach the next level, circulation of fluid under temperature and pressure during electrical conductivity measurements.