Induced polarization of clay-rich materials — Part 1: The effect of desiccation

A petrophysical model describing spectral induced polarization (IP) has been developed for clay rocks accounting the Maxwell-Wagner polarization. It is also used to connect complex conductivity relative permeability of material. This applied Callovo-Oxfordian rock Paris Basin (France) where Meuse/Haute-Marne Underground Research Laboratory located. experiments are performed using eight clay-rock cores study effect desiccation on their spectral-IP response. The measurements along foliation plane. Complex spectra measured over a frequency range 1 mHz 45 kHz. These fitted with double Cole-Cole extract evolution parameters saturation during process. low-frequency corresponds IP phenomena, whereas high-frequency contribution. We obtain value first and second Archie’s exponents we check relationship between surface cation exchange capacity rocks. able curve (saturation) exponent. monitoring can be predict how formation changes water content.