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Theses

Estimation des propriétés hydrodynamiques des aquifères par Résonance Magnétique des Protons
dans différents contextes géologiques,
de l'échantillon à l'échelle hydrogéologique

Abstract : The Magnetic Resonance Sounding (MRS) is non invasive geophysical method which allows estimating the quantity of groundwater and the permeability of porous media. The thesis aims to better understand the factors which control the precision of MRS results and to improve this precision.
Experimental studies including geophysical measurements, pumping tests and measurements on samples were carried out on four sites with various hydrogeological conditions. Concurrently, numerical modelling made it possible to test the sensitivity of MRS to different parameters.
Thus, the precision to estimate the top of aquifers depends on its depth and on the properties of the unsaturated zone. For the case of heterogeneous media, a new 2D/3D methodology of MRS acquisition and interpretation was developed and validated on a karst conduit.
The measurements on samples show that the MRS water content is often underestimated comparing with the water content measured by NMR or classical methods. The quantity of missed water is linked to the magnetic susceptibility of rocks. The MRS water content is generally a good approximation of the effective porosity, but a quantitative relation between these two parameters has still to be found. When additional geological and geophysical data are taken into account to interpret MRS, the precision on the water content is improved.
The MRS transmissivities have values and uncertainties close to those obtained from pumping tests and can be quantitatively used for hydrodynamic modelling.
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Theses
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https://tel.archives-ouvertes.fr/tel-00178045
Contributor : Nathalie Pothier <>
Submitted on : Wednesday, October 10, 2007 - 9:24:23 AM
Last modification on : Thursday, March 5, 2020 - 6:48:59 PM
Long-term archiving on: : Sunday, April 11, 2010 - 10:39:59 PM

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  • HAL Id : tel-00178045, version 1

Citation

Marie Boucher. Estimation des propriétés hydrodynamiques des aquifères par Résonance Magnétique des Protons
dans différents contextes géologiques,
de l'échantillon à l'échelle hydrogéologique. Hydrologie. Université d'Orléans, 2007. Français. ⟨tel-00178045⟩

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