ON THE LOW-FREQUENCY PERMITTIVITY OF LIQUID-FILLED POROUS-MEDIA

We have performed dielectric measurements on natural and artificial ro ck samples in the range 5 Hz- 1 3 MHz. For the lowest frequencies, we get very high permittivities, which do not depend significantly on sam ple thickness. We attribute these permittivities to diffusion effects at the solid-liquid interface. Calculations were made using the so cal led Grain Consolidation Model, which was generalized to include interf ace effects. The model gave reasonable agreement with experiments.