A Correlation between the Different Models of Resistivity Sounding Data to Discover a New Fresh Water Field in El Sadat City, Western Desert of Egypt

Abstract

El Sadat City is a new urban community established in the Western Desert of Egypt near the Hile Delta. The district of the city and vicinity is covered by a thick Pleistocene section of sand and gravel facies based by a thick Pliocene layer of plastic clays.An area, selected from the previous hydrological studies, was covered by 27 deep electric soundinss in order to locate the fresh water aquifers that may occur and to identify the probable geometry of these aquifers. Data collection, reduction and analysis were achieved in site using field computers ~o produce the equivalent layering model and the n-layers model of each sounding. The models were used to construct the subsurface true resistivity bar sections as well as the resistivity contour sections along three profiles using the set of soundings located on each profile. Besides, subsurface horizontal contour sections were produced at different depths.The interpretations of the analysed data revealed that most of the Pleistocene sediments act aa a fresh water aquifer which is charged from the water circulated from the Delta. It was also possible to distinguish subsurface gravel rich channels which yield most of the groundwater potential in the area. The depth to fresh groundwater ranges from 35 m to 65 m according to the relative topography of each sounding site. In addition, the study indicated that another saline aquifer, of probably fossil water, occurs at greater depths beneath the fresh water aquifer. The two aquifers are vertically separated by a thick layer of impervious formations. Recommendations for drilling, in some selected Sites, were reached from the present study. The subsequent drilling operations resulted in the construction of a number of heavy duty water wells (water field B with capaCity of 70,000 m 3 /day) which satisfy the water demand ot the city.

Lineaments Detection and Groundwater Exploration Using GIS and Geo-electric Data at Wadi El-Asyuti Area, Eastern Desert, Egypt.

“…The first surficial resistive layer of wadi deposit with resistivity ranging of 347.4 to 9634.9 Ω.m with average thickness 1.53 m [12] the second geo-electric ranged between 11.2 to 1538.9 Ω.m with average thickness 8.26 m, the third layer ranged between 2.…”

Geoelectrical analysis for evaluating the groundwater characteristics of wadi El Madamud Area, Southeast Luxor, Egypt

“…It is an entirely automated and fast refined method, depended on obtaining the interpreted depths and true formation resistivities from the shifted electrode spacings and the modified apparent resistivities. Based on Sadek et al [29], an additional information, about the subsurface variations within any selected geoelectric layer, can be provided via constructing the n-layer model by Ato program [27], ( Figure 4A). This is after a minimum number of non-automatic iterations, which contribute to perform the input model of the Resist of Velpen, [25], ( Figure 4B).…”

Geoelectrical analysis for evaluating the aquifer hydraulic characteristics in Ain El-Soukhna area, West Gulf of Suez, Egypt

“…It is an entirely automated and fast refined method, depended on obtaining the interpreted depths and true formation resistivities from the shifted electrode spacings and the modified apparent resistivities. Based on Sadek et al (1987), an additional information about the subsurface variations within any selected geoelectric layer can be provided via constructing the n-layer model by Ato program (Zohdy and Bisdorf 1989) (Figure 4(a)). This is after a minimum number of non-automatic iterations, which contribute to perform the input model of the Resist of Velpen (1988), (Figure 4(b)).…”