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<dc:title xml:lang="fr">Caractéristiques géothermiques du réservoir gréseux du Buntsandstein d'Alsace</dc:title>
<dcterms:alternative xml:lang="en">Geothermal characteristics of Buntsandstein sandstone reservoir of Alsace</dcterms:alternative>
<dc:subject xml:lang="fr">Buntsandstein</dc:subject>
<dc:subject xml:lang="fr">Graben du Rhin Supérieur</dc:subject>
<dc:subject xml:lang="fr">Géothermie</dc:subject>
<dc:subject xml:lang="fr">Réservoir Fracturé</dc:subject>
<dc:subject xml:lang="fr">Pétrophysique</dc:subject>
<dc:subject xml:lang="fr">Circulation de fluides</dc:subject>
<dc:subject xml:lang="en">Buntsandstein</dc:subject>
<dc:subject xml:lang="en">Upper Rhine graben</dc:subject>
<dc:subject xml:lang="en">Geothermal science</dc:subject>
<dc:subject xml:lang="en">Fractured reservoir</dc:subject>
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<tef:elementdEntree autoriteExterne="033072566" autoriteSource="Sudoc">Réservoirs gréseux</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="029161797" autoriteSource="Sudoc">Prospection géothermique</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Le Buntsandstein, localisé dans le graben du Rhin supérieur, apparait comme une cible intéressante pour la géothermie, associant une formation argilo-gréseuse à l’anomalie thermique régionale. Cette étude vise à caractériser les propriétés pétrophysiques de ces grès ainsi que la fracturation les affectant, dans le but de fournir un modèle conceptuel de la formation qui servira de guide pour son exploitation futur. Les faciès sédimentaires sont composés par cinq faciès pétrographiques (grès propres, grès à enrobage argileux, grès à matrice argileuse, grès silicifiés et grès à ciment carbonaté), qui se répartissent dans des proportions variables et contrôlent une partie des propriétés pétrophysiques mesurées à l’échelle matricielle. La comparaison des données pétrophysiques, des données macroscopiques issues d’une analyse de gradients de température, des données de modélisation et de la fracturation permet de construire un modèle de circulation dans le réservoir. Ces analyses mettent en avant le rôle de la zone endommagée des zones de faille pour le transfert de fluides à grande échelle, mais aussi celui de deux faciès sédimentaires : les grès déposés dans un environnement de Playa Lake et fluvio-éolien. L’analyse de différents affleurements montre que la fracturation évolue en fonction de la situation dans la pile sédimentaire et en fonction de la situation par rapport aux accidents tectoniques majeures.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The Buntsandstein, located in the Upper Rhine Graben, appears to be an easy target forgeothermal exploitation, linking sandstone and clay with the regional thermal anomaly. This study aims at characterizing petrophysical characteristics of these sandstones as well as the fracturation affecting them, with the intention of providing a conceptual model of the formation which will act as guide for future exploitation. The sedimentary facies are composed by five petrographical facies (clean sandstones, sandstones with clayed coating, clay matrix sandstones, silicified sandstones and carbonated matrix sandstones) which split with variable proportions and control a part of petrophysical properties measured at matrix scale. The comparison between petrophysical data, macroscopic data from temperature gradient analysis, modelling data and fracturing, allows the building of a Buntsandstein Sandstones fluids circulation conceptual model. This analysis points the role of the damage zone of fault zones for fluids transfer at large scale, but also that of two sedimentary facies: marginal erg and Playa Lake. The analysis of different outcrops shows that the fracturation evolves according to the situation in the sedimentary pile and according to the situation in comparison with major tectonic accidents.</dcterms:abstract>
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