GEOPHYSICAL AND GEOTHERMOMETRIC STUDY OF THE HYDROTHERMAL SPRINGS OF BARE-BAKEM (CAMEROON VOLCANIC LINE)

In order to determine the geothermal potential of the municipality of Baré-Bakem, located in both the sedimentary basin of Moungo and the volcanic region of Nkongsamba (Cameroon Volcanic Line), geophysical measurements using electrical resistivity tomography were conducted along a 1km profile between two opposing thermal springs spaced 20 meters apart. The profile was acquired in the SW-NE direction using a 945m long array with 64 electrodes spaced at 15 meters intervalls. The ZZres2Dinv44 software was employed to generate investigative images. The obtained result along the profile reveal the presence of two geothermal zones of interest trapped within permeable sedimentary formations at depths ranging from approximately 20 to 10 meters and close to the surface. From a geothermometric perspective, chemical geothermometers such as silica and Na-K-Ca were calculated by cellecting water samples from these thermal springs and analyzing the physicochemical parameters at the Laboratory of Geochemical Analysis of Waters (LAGE/IRGM) in Nolbisson. The calculations indicate that the Baré-Bakem locality exhibits temperatures ranging from 51 to 90°C for near-surface anomalies and tempeartures ranging from 283 to 300°C for deeper anomalies. These geothermal resources possess high energy potential suitable for electricity production.

Keywords: geothermal, tomography, chemical geothermometers and geothermal energy.