**3.1 Work in the office**

Make an inventory of oil drilling reconnaissance work. The counting of polls reporting was used to select thirty boreholes with their BHT (Bottom Hole Temperature) measured at different depth logging operations to establish a geothermal gradient map. A geological and hydrogeological survey of the thermal springs of writing is based on previous geological research studies.

## **3.2 Fieldwork**

In our scientific research work in the field, we made direct measurements of the Ph, conductivity and temperature of the thermal water and take samples of the water samples of the hot springs of four sites (H. Melouane, H. Righa, H.Médéa and H.Ksénna) to analyze in the laboratory of the National Agency of Water Resources in Algiers to determine their physicochemical characteristics. The results are shown in **Table 1**. We selected four most important thermal springs which were the subject of several measurement campaigns (2014–2015). Work performed and results obtained.

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


**Table 1.**

*Physical and chemical characteristics of the thermal source in the study region (2014–2015).*
