الفهرس 
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Abstract
“Integrated Geophysical Studies for Evaluating Groundwater Aquifers in the Northwestern Coast of Egypt (Matrouh-Salloum)”.
The area selected of study is located in North Western coast of Egypt .It extends from Sidi-Barrani to El-Sallum on the Libyan border in the West. It covers a surface area of about 120.627 km / or 74.954 m between longitudes 25° 0’ 0’’ E ad 26° 0’ 0’’ E, and latitudes 31° 0’ 0’’ N and 31° 40’ 12’’N.
The study area is suffering from the salt water intrusion like the whole region in the north western strip in Egypt. There is a deficiency in water resources for further agricultural, touristic development and to attracting the attention of the government and the investors for future sustainable development.
The aim of this study is carried out to identify and evaluate the groundwater occurrences in the study area, and to study the impacts of the structural features, affecting the area, on these occurrences. In this issue, geophysical technique (electrical resistivity) has been applied to achieve the needed targets of this study. Processing and interpretation of the data, obtained by the fore-mentioned methods, revealed that:
WE are used the Schlumberger array configuration with AB/2 spacing varying logarithmically from 1.5 m to 600 m. we are Measured the apparent resistivity values through 37 vertical electrical sounding (VESes). The interpretation data for quantitative interpretation there are two approaches; indirect method (manual) and direct method (analytical), we are used their two approaches in this study.
The results of this study are, four geoelectrical layers have been detected in this area; the uppermost (surface) geoelectrical layer is composed of Quaternary Holocene alluvial deposits age; the second layer represents the Pleistocene (Surur
XIV
Formation), which is composed of dolometic Limestone;with sandstone and clay interbeds , the third geoelectrical layer corresponds to the highly fractured, water-bearing is belonging to Tertiary, Pliocene (Sidi Barrani Formation and Ogirin Formation) composed of fractured Limestone, interbedded with sandstone and shale. The fourth geoelectrical layer corresponds to the highly fractured, water-bearing, fractured Limestone with clay interbeds, It belongs to Tertiary, Middle Miocene (Marmarica Formation).
Geological and hydrogeological information obtained from the drilled wells in the study area indicate that, the groundwater exists in this area at two aquifers. The first aquifer is represented by the fractured Limestone, interbedded with sandstone and shale belonging to the Tertiary, Pliocene (Sidi Barrani Formation and Ogirin Formation), while the second aquifer is represented by the fractured Limestone with clay interbeds, It belongs to Tertiary, Middle Miocene (Marmarica Formation). It has been found that, the groundwater occurrences are largely controlled by the structural features affecting the area under study.