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Exploration of the deep geothermal potential of Petite-Terre Island in Mayotte

Abstract

In 2017, the electricity mix of the Department of Mayotte included 5% photovoltaic production, spread over more than 70 installations on the island, and 95% diesel thermal production, provided by two power plants. Nevertheless, since 2005, in order to diversify its electricity supply, the local authorities of Mayotte set up a vast program to develop renewable energies, including the evaluation of Mayotte's geothermal potential to produce electricity. In this framework, BRGM started a program to explore the deep geothermal potential of the department of Mayotte. The conclusions of the different studies confirmed the idea of a strong potential under Petite Terre (Traineau et al., 2006; Sanjuan et al., 2008; Darnet et al., 2019). Our present study aims at refining the knowledge of the subsurface and the geothermal system potentially present beyond a depth of 1000m. This new phase, carried out between 2021 and 2022 includes a geophysical measurement campaign accompanied by a fracture analysis and the study of gas emanating from the ground. The different data set acquired during the campaigns are analysed and interpreted jointly with the data acquired in the framework of the monitoring of the exceptional seismo-volcanic activity observed since May 2018 off the coast of Mayotte. The result of this analysis is a 3D geological model of the structure of the island of Petite Terre, completed by a hydrothermal model of the functioning of the geothermal system, with the aim to help in locating the most favourable zones for geothermal exploitation.
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Dates and versions

hal-03799757 , version 1 (04-01-2023)

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  • HAL Id : hal-03799757 , version 1

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Chrystel Dezayes. Exploration of the deep geothermal potential of Petite-Terre Island in Mayotte. 9TH AFRICAN RIFT GEOTHERMAL CONFERENCE - ARGEO C9, Nov 2022, Djibouti, Djibouti. ⟨hal-03799757⟩

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