Relation between electric properties and water saturation for hematitic sandstone with frequency

M. M. Gomaa


This paper focuses on the effect of water saturation on A. C. electrical conductivity and dielectric constant of
fully and partially saturated hematitic sandstone sample (Aswan area, Egypt). The saturation of the sample was
changed from partial to full saturation. Complex resistivity measurements at room temperature (~16°C), were
performed in the frequency range from 0.1 Hz to 100 KHz. Experimental electrical spectra indicate, generally,
that the electrical conductivity and dielectric constant vary strongly with water saturations and frequency. The
low frequency electrical conductivity and dielectric constant are mainly controlled by surface conduction and
polarization of the electrical double layer. The behaviour of the electrical conductivity and dielectric constant,
with increasing water content, were argued to the orientational polarization of bound water for very low saturations,
displacement of the excess surface charges for relatively low saturations, and free exchange of excess ions
in double layer with the bulk electrolyte and generation of transient diffusion potentials which lag behind the
applied field for high saturations.


Electric properties;complex conductivity;frequency;hematite;water saturation

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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X