Geophysical Study in North Ghoubbet
Faced with the energy challenges of the new millennium, geothermal energy undoubtedly represents potential energy in Djibouti. Nord-Ghoubbet is one of the most important sites for geothermal development Djiboutian office for geothermal energy development (ODDEG). In 2010, the Center for Studies and Research of Djibouti (CERD) has carried out the geoscience study in the northern region of Ghoubbet. North-Ghoubbet geothermal prospect is located in the eastern part of the capital city about 140 km. As part of this study, several geophysical data have been collected such as MT and TDEM. In this paper, we interest geophysical study especially the MT method. The geological context of the North Ghoubbet is very interesting because it is located in the divergent system (the ridge of Aden Gulf). This area is mostly covered by basalts rock. Non-conformingly covering the faulted and eroded Dalha series and the detrital alluvial terraces formed during the uprising of the Goda Mountains massif. A hot spring at 80 ° C is identified on the coast, and several fumaroles have been found on the normal faults. Three recent volcanic series (Dalha Basalt, Gulf, and Asal) are present in this study area which is the results from a polyphase tectonic-magmatic evolution of the rift zone. The main fault systems in the region tend to be NNW-SSE and NW-SE, comprising several faults. Most of the surface geothermal activity is located along these faults, and a hot spring has been found where it is intersected by an E-W trending fault. Therefore, the distribution of geothermal events appears to be controlled by faults, leading to the belief that these faults are active. The objective of this paper is to identify the possible reservoir to produce geothermal energy using the magneto-telluric (MT) method and also to find the relationship between the fracture and the thermal manifestation.
|        Topic: Geophysics||Paper Number: 13123|