*4.4.2 Hammam-Righa*

The hydrogeological study reveals the existence of two aquifers, the most important is represented in Zaccar Chergui by cracked limestone of the Upper Jurassic, strongly mineralized and intensely karstified. These limestones are based on the schist-quartzite waterproof primary series and are an important reservoir whose static level is close to the coast 700 m.

**Figure 6.** *Classification of the thermal springs (piper diagram).*

*The Hot Springs of Central Northern Algeria Hydro Geochemical and Therapeutic Aspects… DOI: http://dx.doi.org/10.5772/intechopen.97803*

**Figure 7.** *Classification of the thermal springs (diagram Schoeller-Berkaloff).*

#### *4.4.3 Hammam-Medea*

A thermal spring with a flow rate of 3 liters/second. The waters of Hammam Medea emerge the feet of the northern flank of Jebel El Gharbi Souebah. They are very rich in mineral and weakly conductive. The most dominant ion correspond bicarbonate and sodium. The mineralization of these waters is acquired by the leaching of geological formations during their ascent. The Cretaceous formations, limestone of the Turonian and Vraconian are the only aquifer can supply the hot spring.

#### *4.4.4 Hammam-Bouira (a) (b)*

The waters of Hammam Ksana (Bouira) emerging south of the plain of El-Asnam. They are loaded with minerals and highly conductive. The most dominant ions are chloride and sodium. The mineralization of these waters is acquired by alteration lithologies traversed during circulations of underground fluids. The aquifer can match the Cenomanian limestone.

### **5. Geothermal resource in Algeria**

Geothermal resources are various low temperatures. They are located in northern Algeria and northern Sahara [8].

In the north, the reservoirs are complex and discontinuous. They consist of facies (limestone, sandy limestone and sandstone) of the Mesozoic and south, a continuous tank is composed mainly of sandstone [9].

He was appointed tableclot Albian [10].

The distribution of thermo-mineral waters, in Algeria, is very irregular. These sources are increasing in number gradually as one approaches from the east. This distribution seems to follow that of the ore deposits. Thus it has about twenty mineral springs in the region of Oran, about 40 in the Algiers and 150 in the region of Constantine.

**Figure 8.** *Main geothermal area [11].*

In the North, in part including the Saharan Atlas to the sea, emerging more than 200 hot springs. The water temperature varies between 22 and 98° C and mineralization total dissolved salt varies between 4 and 10 g/l. The reservoirs are typically at depths between 1500 and 2500 m.

South, the water Albian covers an area of 600,000 km2 . It is semi-free in the western and captive and warm only in the eastern part (**Figure 5**) [11]. The roof of the aquifer to the east is located between 1000 m and 2600 m, the average temperature of water is 60° C and an operating rate of 4 m3 /s, the water Salinity is 3 g/approx.

The geothermal potential to dewatering, by summing the total flow of the hot springs flow from operating Albian aquifer is over 700 MW (**Figure 8**).
