La prospection geothermique de surface au Maroc: hydrodynamisme, anomalies thermiques et indices de surface |
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| Authors: | Y Zarhloule A Lahrache L Ben Abidate D Khattach S Bouri A Boukdir H Ben Dhia |
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| Institution: | a Laboratoire de Géologie Appliquée, Environnement et Hydrogéologie, Faculté des Sciences, Oujda, Maroc;b Faculté des Sciences et Techniques de Fès-Saïss, Fès, Maroc;c Faculté des Sciences et Techniques de Beni-Mellal, Béni Mellal, Maroc;d Laboratoire d'Hydrogéologie-Geothermie, Ecole Nationale d'Ingénieurs de Sfax, Sfax, Tunisie |
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| Abstract: | Shallow geothermal prospecting ( < 700 m) has been performed in four zones in Morocco for which few deep data are available: northwestern basin, northeastern basin, Tadla Basin and Agadir Basin. These areas are different geologically and hydrogeologically. The temperature data from 250 wells at depths between 15 and 500 m have been analysed in order to estimate the natural geothermal gradient in these areas, to determine the principal thermal anomalies, to identify the main thermal indices and to characterise the recharge, discharge and potential mixing limits of the aquifers.The hydrostratigraphical study of each basin revealed several potential reservoir layers in which the Turonian carbonate aquifer (Tadal and Agadir Basins) and Liassic acquifer (Moroccan northwestern and northeastern basins) are the most important hot water reservoirs in Morocco. The recharge zones of each aquifer are characterised by high topography, high water potential, shallow cold water, low geothermal gradient and negative anomalies. The discharge zones are characterized by low topography, low piezometric level, high geothermal gradient, high temperature with hot springs and positive anomalies. The main thermal indices and the principal thermal anomalies that coincide with the artesian zones of the Turonian and Liassic aquifers have been identified. |
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