الفهرس 
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Abstract
For exploration ground water in wide area of Wadi El-Natrun, the vertical electrical sounding techniques (VES) was installed and deduced for 43 geoelectric profiles. Data were collected around 20 wells to determine the hydraulic parameters of soil layers from 1.5 to 18 m as maximum depth. The measured parameters included the electrical resistance of the different layers as well as measurement of the thickness and depth of the layers, in additions the relationship between the resistance and saturation percentage, and also the relationship between hydraulic conductivity and electrical resistance. The interpretation of resistivity data, referred to the resistivity of this soil, ranged between 2Ω.m and 982.5Ω.m.These VES were interpreted to determine the subsurface layers and the true resistivity’s, lithology’s and thicknesses variations of such layers. The result of this geoelectrical analysis is the subdivision of the shallow section into five geoelectric layers throughout the study area, except in some parts, where the surface layer disappeared; and the fifth layer is not reached. These layers varied in their resistivity’s from very low to high values. However, the groundwater is generally contained in the second layer of the unconfined Nile Delta aquifer (Quaternary period), in the third and fourth layers of the confined and semi-confined Wadi El-Natrun aquifer (Pliocene period), then in the fifth layer of the Moghra aquifer (Lower Miocene period). The well log data of the resistivity, SP and gamma-ray logs were used for evaluating the rock units encountered in 20 wells. Then, the statistical analysis from the true resistivity that derived from the geoelectric analysis, and water saturation that deduced from the well log analysis, was carried out, only to the third layer. The results of these calculations showed that, the third layer as high groundwater content, then the fourth layer, but the second layer contains the least amounts. Therefore, the electrical resistivity measurements can be used for estimating the groundwater amounts in case of availability the geological information and the well log data are not available. It may be concluded from the present study : Exploration of ground water in Wadi El-Natrun using the VES sound electric instrument. Collected data of 20 wells for 5 years and VES readings data were analysed for different thickness and layers from 0 up to 18 m, to obtain the relationship between the storativity, layer saturation percentage on hydraulic conductivity and transmissivit.