The use of magnetic and geo-electrical data to delineate the subsurface structures and groundwater potentiality in South
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ORIGINAL ARTICLE
The use of magnetic and geo-electrical data to delineate the subsurface structures and groundwater potentiality in Southeastern Sinai, Egypt El Sayed Ibrahim Selim • Osama Abdel-Raouf
Received: 31 May 2011 / Accepted: 10 January 2013 Ó Springer-Verlag Berlin Heidelberg 2013
Abstract The study area is located in the southern part of Sinai Peninsula. This study was done to delineate the subsurface structure of the basement rocks affecting the groundwater potentiality in the study area and to perform the lateral and vertical variations in the subsurface lithologic properties. To achieve these, a high-resolution total intensity magnetic map and geo-electrical survey were acquired. Two-dimensional power spectrum, analytical signal, and Euler deconvolution techniques are applied on magnetic data. The geo-electric data interpretations concluded that, the study area can be classified into five units of sediments arranged as: (1) the top surficial layer of dry sand and gravels; (2) the second layer of silty sand layer with thickness ranging from 5 to 35 m; (3) the third layer of dry sand with thickness ranging from 5 to 130 m; (4) the fourth layer composed of saturated sand which was considered as the water-bearing zone of the investigated interval, its thickness ranges between 50m and more than 200 m; (5) the fifth layer is interpreted as basement rocks. The depth to the basement surface has an average value of 156 m at the eastern side and 758 m at the western side of the study area. This area is characterized by a graben structure bounded by major faults striking in the NW–SE direction and is considered one of the most promising regions for water resources in Sinai.
E. I. Selim (&) Geology Department, Faculty of Science, Damietta University, New Damietta, Egypt e-mail: [email protected] O. Abdel-Raouf Water Resources Research Institute (WRRI), National Water Research Centre (NWRC), Cairo, Egypt
Keywords Euler deconvolution Analytical signal Power spectrum Geo-electric survey Groundwater potentiality Sinai
Introduction Sinai Peninsula is located at the northeastern corner of Egypt and separated geographically from the Eastern Desert by the Suez Canal and Gulf of Suez. The Southern part of Sinai forms its core and rises considerably to elevations up to 2,641 m. This region is considered to be an active seismic area due to the presence of the triple junction of the Gulfs of Suez and Aqaba and the Red Sea (Khalil 1998). Dahab area is a part of Southern Sinai and characterized by rugged topography due to continuous erosion and development of the drainage pattern (Shawky 2008). It is located approximately between longitudes 34°000 and 34°300 E and latitudes 28°000 and 28°450 N (Fig. 1). Many geophysical studies have been undertaken toward understanding the subsurface geological structure and groundwater potentiality of this area. Magnetic and geoelectric data are related to different rock attributes in the subsurface but their attribute contrasts often coincide, a phenomenon which constitutes
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