Abstract
The Sidi Saad basin is located in the NS axis in central Tunisia. This zone was affected by several distension and compression phases inducing the structuring and the distribution of Neogene deposits. The study area is known by the presence of important water reserves. The surface water needs for the demographic growth and for both the agricultural and industrial sector developments. So, the exploitation of deep aquifers reveals a vital issue in Tunisia whose water resources are limited. To satisfy these needs, exploration and characterization of deep aquifers is necessary. The present study, based on hydraulic and petroleum wells' correlation, seismic line interpretation, and hydrochemistry, addresses the geometry, and the hydrogeological characterization of Miocene-Pliocene-Quaternary reservoirs is undertaken for the first time in Sidi Saad basin. The results highlight that the structural framework, based on major structures, controls the Mio-Pliocene siliciclastic deep reservoir deposits, the groundwater flow, and the sub-basin aquifer distribution. The water geochemistry study exhibits low salinities in the northern and the southeastern parts of the study area with different facies of Ca-HCO3 and Na-(Ca)-Cl-(SO4) and constitute an important source of drinkable and irrigation water.