THE EFFECTS OF SALINITY ON LOW-FREQUENCY DIELECTRIC-DISPERSION IN LIQUID-IMPREGNATED POROUS SOLIDS

In this letter we study the dielectric properties of brine-impregnated artificial sandstones. The frequency-dependent dielectric permittivit y shows a relaxation due to the electrochemical double layer at the in terfaces. Good agreement was obtained with a theoretical expression, r igorously valid for dilute colloidal suspensions. The relaxation frequ ency and amplitude displayed clear dependences on brine conductivity. At the highest liquid conductivities studied, electrode effects were o bserved at low frequencies.