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Hétérogénéité géologique, spéléogenèse et hydrodynamique du karst : du concept à la modélisation numérique

Abstract : This work aims to integrate the explicit geometries of karst conduits in flow models.Based on both field observations of karst developments as well as modeling approaches for speleogenesis processes and hydrogeology, three scientific subjects are developed in this thesis.First, investigations of the fontaine de Vaucluse systems, mainly in the unsatured zone, allow identification of the key parameters that control the karst conduit geometries.These geological and hydrological parameters affect the preferential flow paths and the piezometric level.Second, using these concepts on karstogenesis, karst network development is studied through 3D modeling.Synthetic models enable the study of the relationship between karst conduit architectures, fault network petrophysical properties and heterogeneities in the matrix hydraulic conductivity.Moreover, well-established concepts and data spatial distribution methods are criticized and improved.Third, hybrid models explore the impact of explicit representation of karst conduits combined with the influence of the unsaturated zone on hydraulic behavior.These models are tested against published concepts in the vicinity of karst conduits and at the reservoir scale.The different numerical experiments return the expected hydrodynamic behavior.This highlights the coupled flow impact of conduit and matrix petrophysical properties.As a conclusion, this thesis proposes a global method for modeling karst reservoirs in order to integrate, as far as possible, matrix and conduits heterogeneities.
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Submitted on : Wednesday, July 8, 2020 - 10:17:19 AM
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Lucie Dal Soglio. Hétérogénéité géologique, spéléogenèse et hydrodynamique du karst : du concept à la modélisation numérique. Autre [q-bio.OT]. Université d'Avignon, 2019. Français. ⟨NNT : 2019AVIG0057⟩. ⟨tel-02893236⟩

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