الفهرس 
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Abstract
Recently great investments and governmental effort have been done for developing Sinai Peninsula. So, the present study aims to identify the surface and subsurface geological and hydrogeological settings controlling the groundwater occurrences in a part of Central Sinai and to delineate the most proper sites for drilling water wells. Hence, the magnetic, gravity and geoelectrical resistivity were integrally concerned to achieve such aims. Different techniques of processing and interpretation of the magnetic and gravity data were applied ; such as frequency filtering, spectral analysis, 3D Euler deconvolution and 3D modeling. The results of acquired data interpretation show that, the depth of the basement surface in the study area is ranging from 1658 m to 1857 m below sea level, which is shallower in the western part than eastern and northeastern parts of the study area. Also the interpreted subsurface fault structures ( horsts and grabens ); as deduced from the gravity and magnetic data interpretation show that, the study area is affected by three major structural trends ; NW – SE ( Gulf of Suez trend ) , NNE – SSW ( Aqaba trend ) and NEE – SWW ( Syrian arc system trend ). Also seventeen deep vertical electrical soundings ( VES’s ) using Schlumberger array with maximum AB/2 ranging from 5 to 3000 m were measured in order to detect the thickness and resistivities of the subsurface geoelectric units as well as the depths of the main deep Nubian sandstone aquifer ( Malha Formation ) in the study area. The results of the resistivity data interpretation showed that, this aquifer has its upper surface ranging from about 316 m to 956 m in depth. This aquifer attains resistivity values ranging from about ( 50 Ω.m to 412 Ω.m ) which makes it the main aquifer for probably good quality groundwater accumulations; as recorded from some of drilled water wells. In general, according to the integrated results, the western part of the study area is suitable for further drilling water wells.