Geophysical Contribution in the Characterization of Deep Water Tables Geometry (Sidi Bouzid, Central Tunisia)

Abstract

Geophysical data combined with geological and hydrogeological data were analyzed to characterize the geometry of Oued El Hajel and Ouled Asker deep water tables (Sidi Bouzid). The obtained results allowed refining the geostructural schema by highlighting the individualization of the NE-SW underground convexity of Ouled Asker and the anticline of axis Es Souda-Hmaeima and Ezaouia on either sides of two hydrogeological thresholds. The geometrical analysis determined the spatial extension of Ouled Asker and Oued El Hajel subbasins. The seismic cartography of semideep and deep reservoirs (Oligo-Miocene; Eocene and upper Cretaceous) associated with the main subbasins contributed to proposing hydrogeological prospect zones for a rationalized groundwater exploitation.

Hydrogeothermal potential assessment in a complex tectonic environment by geophysical and hydrogeochemical tools: a case of the geothermal province of Hajeb Layoun-Jilma-Oued Hjal basins (Central Tunisia)

“…3). This section highlights the Hajeb Layoun graben and the Baten Damous outcrop in the NE side and the Jilma-Ouled Asker syncline in the SW side (Jellalia 2010;Khazri 2014;Khazri and Gabtni 2014;Jellalia et al 2015;Jellalia 2016;Thebti et al 2018;Azaiez et al 2020). From West to East, seismic horizons dip to the depth from the eastern flank of Jebel Mghilla, going towards the Hajeb Layoun-Jilma plain and recording the maximum thickness of the sediments.…”

“…Based on previous works in the study area (Burollet 1956;Koschell 1980;El Ghali 1992;Zouaghi 2008;Saidi 2006;Azaiez 2011;Hajji et al 2013Hajji et al , 2018Sayem 2012;Khazri et al 2014;Jellalia et al 2015;Thebti et al 2018;Azaiez et al 2020), it was possible to better understand the geologic deep structuring of the basins and to describe the various configurations that might constitute hydrogeological reservoirs and hydrodynamism.…”

“…From a hydrogeological point of view, the Hajeb Layoun-Jilma and Oued Hjal aquifer systems are made of Saouaf, Beglia, Ain Ghrab, Fortuna, Metlaoui, and Abiod Formations (Jellalia 2010;Azaiez 2011;khazri 2014;Khazri et al 2014;Jellalia et al 2015;Jellalia 2016;Thebti et al 2018). These aquifer systems are composed by Plio-Quaternary shallow aquifers, semi-deep aquifers (Oligo-Miocene sand and sandstones), and finally of the deepest aquifers (Upper Cretaceous-Lower to Middle Eocene carbonate).…”