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North-East of Algeria, in The Souk Ahras region, the Triassic evaporates are in the form of important intrusive masses. Thermal and cold water emerge from various training. These sources present are taking their pathways along the faulting system. A complex multilayered reservoir has significant potential water. The karstic aquifer consists mainly on fresh water.Thermal water characterized by high salinity is carbo-gaseous. Collection and chemical analysis of major water elements in addition to nonionic mineral compounds (SiO 2 ) and trace elements (Sr 2+ , F -, Br -) have determined a deep saline fluid circulation. The tectonic effect would be responsible for the current water flow. Cartography of fracturing system has identified a NNW-SSE hot spring distribution. Similar alignment can match the faulting system direction affecting the concerned study area.

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In the North-East Algeria, in the zone of diapirs, the previous hydrogeologic study of the region of Souk-Ahras Taoura had identified the multilayer aquifer system of Miocene sandstones and carbonates of lower and upper Cretaceous. The formations are generally dominated by carbonate intercalated with marl, highly fractured and folded (NE-SW), in parallel to the direction of the structures outcrops the Triassic diapiric. The thermal carbonated aquifer updates of the Neogene-quaternary of highly mineralized springs with low discharge (Hammam Tassa, Ain El Damssa); the fissural aquifer and the maastrichtian and campanian aquifers, widely exploited for the drinking water and the irrigation, contain an important potential in water. For a better understanding of the functioning of the aquifer system, it seemed necessary to characterize him by geochemical tracers of carbonates and evaporates. The geochemical data of waters of sources and main drillings showed, on one hand that thermal waters circulated rather profoundly by washing the Triassic evaporitic, and on the other hand which the fracturing in distension allowed waters to drain simultaneously aquifers. Thus, waters appearing to springs would be a mixture, in variable proportions, between the different types of water flowing in this hydrothermal karst system.