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HYH-01 General contributions to hydrogeology

Deep hydrogeologic reservoirs investigations by surface and subsurface analyses in Eastern Tunisia

Mourad Bedir, Centre of Water Researches and Technologies/Borj Cedria Technopark (Tunisia)
Mohamed Soussi, Centre of Water Researches and Technologies/Borj Cedria Technopark (Tunisia)
Riadh Chebbi, Centre of Water Researches and Technologies/Borj Cedria Technopark (Tunisia)
Sami Khomsi, Centre of Water Researches and Technologies/Borj Cedria Technopark (Tunisia)
Ramzi Gharsalli, Centre of Water Researches and Technologies/Borj Cedria Technopark (Tunisia)
Jamel Shimi , Centre of Water Researches and Technologies/Borj Cedria Technopark (Tunisia)
Fethi Lachaal , Centre of Water Researches and Technologies/Borj Cedria Technopark (Tunisia)
 

The scarcity of water resources in Mediterranean regions and specially in North Africa has pushed to investigate new geologic reservoirs for Human and Agriculture use in a region of great demand. Geologic and Geophysic investigations in Eastern Tunisia for deep aquifer reservoirs have been carried out these last years by new intgrated approachs in collaboration with the Ministry of Agriculture and Water Resources.
Geophysical wireline loggin and seismic analyses methods combined to surface outcrop sedimentologic ans structural analyses had permitted the highlights of new deep water reservoirs that show a great amount of reserves.
In the Neogene and Oligocene silicoclastic deposits ten sandstone level reservoirs had been caracterized as an important aquifers. The thikness average of these geologic strata is about 10 to 50 meters with an average of porosity of 25 to 35 %. The total estimated amount of water reserves are about 2000 000 Million meter cubes for the Sahel region whitch occupied a surface of 5000 square kilometers. In the other hand, the calculated renewable surface and phreatic groundwater resources per year in Tunisia are 5 000 million meter cubes. This new multidisciplinary approach is used for the first time in Tunisia and had conducted to new very important deep water resources for the economy and the development of the region of Eastern Tunisia.
In this communication a study case of this new approach will be presented and discussed as a model of integrated study for research and development program.