STRUCTURAL IMPACT OF THE TERTIARY BASALT SETTING ON THE GROUNDWATER AQUIFERS USING GEOPHYSICAL TECHNIQUES IN THE AREA WEST CAIRO-ALEX. DESERT HIGHWAY BETWEEN THE KM 42 AND 52 | ||
| Journal of Egyptian Geophysical Society | ||
| Volume 15, Issue 1, 2017, Pages 19-37 PDF (2.02 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jegs.2017.385674 | ||
| Authors | ||
| M.A. Khaled; A.M. Youssef; M.S. Barseem | ||
| Desert Research Center, 1. Matahaf El Matariya street, El Matariya, Cairo, Egypt. | ||
| Abstract | ||
| The interpretation results of 62 Vertical Electrical Soundings (VES) and the available well logging data in the study area revealed that the geoelectrical succession is consisting of four units (A, B, C and D) corresponds to Pleistocene deposits, Lower Miocene Moghra Formation, Oligocene deposits and Eocene limestone respectively. Three water-bearing formations were identified in the study area. These water-bearing formations are namely, the Lower Miocene Moghra aquifer (geoelectrical layers B2 and B3), the Oligocene aquifer (geoelectrical layers C4, C5 &C6) and the Eocene limestone (unit D). The Tertiary basaltic sheet (geoelectrical layer C1) acting as a marker bed separating the overlying Moghra aquifer from the underlying Oligocene aquifer. The Tertiary basalt acts as a marker bed separating the overlying Moghra aquifer from the underlying Oligocene aquifer. The Tertiary basalt is found at shallow depths (4m.) in the southeastern part of the study area whereas; the depth increases gradually northwest wards to more than 220 m. This is mainly attributed to the effect of a group of normal step faults with downthrown side west and northwest wards. These faults cause the convergence of Moghra and Oligocene aquifers along the two sides of the faults making a hydraulically connection of the two aquifers The estimated shale volume percentage from natural gamma-ray logs with the sand of Lower Miocene Moghra and Oligocene aquifers revealed that the Moghra aquifer has the lowest values but the Oligocene aquifer has the highest values. According to these results, the northwestern part of study area has the priority of drilling new wells. Key words: Structure, Tertiary Basalt, Groundwater, Aquifers, Vertical Electrical, Sounding (VES). | ||
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