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Étude de l’impact simultané des propriétés électriques, diélectriques et magnétiques du sous-sol sur la mesure géophysique par méthode électromagnétique inductive dans le domaine temporel (TDEM)

Abstract : The geophysical electromagnetic inductive method in the time domain (TDEM) is used in fields such as hydrology or in mining exploration. It allows the establishment of electrical resistivity models of the subsurface. Using this methods with reduced acquisition loops with a width of only a few meters, makes the measurement more sensitive to additional parameters : the dielectric permittivity and the magnetic permeability. The present research work aims to acquire a small-loop TDEM sounding and to extract not only an electical resistivity model but also an estimation of the dielctric permittivity and of the magnetic viscosity. The acquisition of a small-loop TDEM sounding implies a increased sensitivity to the response from the acquisition system itself, in part because of the reduced distance between the transmission and reception loops. Simulations aiming to reproduce this system response have been carried out to be able to take it into account during the data processing step. A specific acquisition geometry is then proposed to ease the multi-parameter interpretation of the TDEM data. The effects from the electric, dielectric and magnetic properties of the ground are overlapping on the measurements in the central configuration. Using different geometry with lower sensivities to dielectric permittivity and magnetic viscosity should make the contribution of each parameter easier to isolate. These methological developments were then tested with field measurement on the test site of Garchy (Nièvre, France).
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https://tel.archives-ouvertes.fr/tel-02978830
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Submitted on : Monday, October 26, 2020 - 6:02:23 PM
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  • HAL Id : tel-02978830, version 1

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Cécile Finco. Étude de l’impact simultané des propriétés électriques, diélectriques et magnétiques du sous-sol sur la mesure géophysique par méthode électromagnétique inductive dans le domaine temporel (TDEM). Sciences de la Terre. Sorbonne Université, 2019. Français. ⟨NNT : 2019SORUS103⟩. ⟨tel-02978830⟩

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