Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/5002
Authors: | Gomaa, M. M. | Title: | Relation between electric properties and water saturation for hematitic sandstone with frequency | Issue Date: | Oct-2008 | Series/Report no.: | 5-6/51 (2008) | URI: | http://hdl.handle.net/2122/5002 | Keywords: | Electric properties complex conductivity frequency hematite water saturation |
Subject Classification: | 03. Hydrosphere::03.02. Hydrology::03.02.99. General or miscellaneous | Abstract: | 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. |
Appears in Collections: | Annals of Geophysics |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
04 Gomaa.pdf | 572.46 kB | Adobe PDF | View/Open |
Page view(s) 5
453
checked on Apr 24, 2024
Download(s) 5
1,007
checked on Apr 24, 2024