Geothermal Exploration Under Geology and Geophysics Methods in North Algeria

Abstract

The study area in the north Algeria appears as a slightly waved landscape extending between the Saharien Atlas from South and the Mediterranean Sea to the North. The High Plain average altitude is 900 meters. We have in the northern border isolated reliefs: Djurdjura Montaigne (1200 meters), DjebelTnoutit (1193 meters). DjebelTella (1055 meters). There is some closed depressions in which are: SebkhetBazer, Sebkhet El Hamiet, the Chott El Fraïn, sebkha Oran. In this paper we based on geological, geophysical and hydrogeochimistry investigation for geothermal reservoir to develop it's lithological.The hydrogeology study allowed us to identify the main aquifers in the region, which are the Mio-plio-quaternaire aquifer near surface and the carbonated aquifer (Jurassic and Cretaceous) in the deep. The electric soundings supplied invaluable geological information for the exploration of the groundwater. We have some limestone out croup in (DjebelsYoussef ), although affected by numerous faults. In the zones of overlapping ( DjebelTnoutit) the outcrops are reduced. The calcareous formations constitute good aquifers. The study established by the Geophysics specially the electrical sounding tools had just confirmed some geological work fields where we take same cross section and geological maps interpretation . Finally, to optimize geothermal reservoir exploitation so much point of hydrodynamics as water quality, it's better to exploit the aquifer in limestone's of the lower Cretaceous (Aptien. Barrémien). Results show that the geologic structure of the region would be the one of a graben weaknesses faults and the waters of study area have a chemical type of the sodic chloride.