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Magnetic acquisitions and interpretations for geothermal exploration in Guadeloupe, Lesser Antilles ; Acquisitions et interprétations magnétiques pour l'exploration géothermique en Guadeloupe, Petites Antilles
This thesis focuses on the application of the magnetic method to the geophysical exploration of a geothermal area. The study area is located in the volcanic field of Basse-Terre, the westernmost island of Guadeloupe, where fractures, fluids and heat flows generate a high geothermal potential. Thus, this manuscript organization follows the course of an exhaustive magnetic study, which begins with the understanding of the considered context and objects, from the economic, geological and geophysical point of views. Then existing magnetic data are collected, leading to the design of new magnetic acquisition and processing methods to meet the specific constraints of the study area. The proposed acquisition techniques, carried by drone (for onshore data) or by boat (for offshore data), allow for high-resolution and multi-altitude surveys. Once the datasets are obtained and processed, they are interpreted at different scales alongside existing geological input. A spectral inverse problem resolution is also proposed. Finally, a comparison is carried out with all the other geophysical data that can be obtained: magnetotelluric method, transient electromagnetism and gravimetry. ; Cette thèse porte sur la méthode magnétique appliquée à l'exploration géophysique d'une zone à caractère géothermique. L'étude se concentre sur la zone volcanique de Basse-Terre, à l'Ouest de la Guadeloupe, dont les fractures, les fluides et les flux de chaleur engendrent un fort potentiel géothermique. Ainsi, le plan de la thèse suit le cours d'une étude magnétique complète, ce qui commence par la compréhension du contexte et des objets à considérer, autant d'un point de vue économique que géologique puis géophysique. S'ensuit un travail de collecte et de traitement des données magnétiques existantes, menant à la conception de nouvelles techniques d'acquisition ou de traitement pour répondre aux besoins spécifiques de la zone d’étude. Les techniques d’acquisition magnétique proposées, par drone (données onshore) ou par bateau (données offshore), ...
Géothermie, Geophysics, [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], Magnétisme, Magnetism, Géophysique, GEOTREF, Geothermal energy, Guadeloupe
Géothermie, Geophysics, [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], Magnétisme, Magnetism, Géophysique, GEOTREF, Geothermal energy, Guadeloupe
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