| Abstract: |
The study area, Siwa Oasis, is located at the North Western Desert, about 300km South of the Mediterranean Sea Cost (Matrouh City) and extended in an E−W direction, occupying an area of about 980 km2.The present study deals with interpretation of the available Vertical Electrical Soundings (VESes), as well as analysis of the given well log data (gamma-ray, short and long normal resistivities, self potential, caliper, neutron and density) within the stThirty Vertical Electrical Sounding (VESes) stations were measured throughout the study area. Quantitative interpretation was done through the analysis of the field curves in terms of electric layers of specified thicknesses and resistivities using both ZAll the available well log data, used in the evaluation for the rock units encountered in eleven wells selected in Siwa Oasis area, are corrected by using Hocoor1 program. Principally, the matrix volume (Vma), shale volume (Vsh), total porosity (t), effeThe Dia-porosity cross plots (shale model) and the neutron-density cross plots are constructed in each well for the two aquifers. The Litho-saturation cross plots are used for showing the integration among Vma, Vsh, Swr, and Swirr of the two formations (cThe piezometric head, pressure and gradient maps are constructed to show the engineering properties changes for the Nubia Sandstone aquifer. These maps reflect that, the piezometric heads, pressures and gradients decrease to the western direction along thThe resistivity, neutron and density logs are used for defining the different zones of over-pressuring in the Nubia Sandstone aquifer. These logs reveal a decrease of the depth to the top of over-pressuring from the areas parallel to the coordinate 25°30\From the statistical analysis using MINITAB package, the following deduced linear regressions for the carbonate aquifer; in case of estimating the effective porosity (eff) from the total porosity (t) and the reducible water saturation (Swr) from the eff
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