Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/5002
AuthorsGomaa, M. M. 
TitleRelation between electric properties and water saturation for hematitic sandstone with frequency
Issue DateOct-2008
Series/Report no.5-6/51 (2008)
URIhttp://hdl.handle.net/2122/5002
KeywordsElectric properties
complex conductivity
frequency
hematite
water saturation
Subject Classification03. Hydrosphere::03.02. Hydrology::03.02.99. General or miscellaneous 
AbstractThis 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.
Appears in Collections:Annals of Geophysics

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