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PhD in Electromagnetic Geophysics M/F

This offer is available in the following languages:
Français - Anglais

Date Limite Candidature : mardi 12 juillet 2022

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General information

Reference : UMR7063-GUYMAR-004
Workplace : STRASBOURG
Date of publication : Tuesday, June 21, 2022
Scientific Responsible name : Guy Marquis
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 3 October 2022
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly

Description of the thesis topic

The Athabasca Basin (Canada) hosts several high-grade uranium deposits. The standard geophysical exploration workflow relies on Electrical Resistivity Tomography (ERT) and Airborne and Land Electromagnetics (EM). Most uranium deposits in the Basin are associated to subsurface conductors.

In practice, we often analyse EM and ERT data separately as they are acquired for different purposes: EM data focus on basement conductors and ERT targets alteration or silicification zones in the overlying sandstone. Both methods however are sensitive to the same physical parameter: electrical resistivity.

So the PhD project aims to develop a joint inversion methodology for EM and ERT data by including petrophysical information in the inversion process. One of the possible approaches are the correspondence maps proposed by Carillo & Gallardo (2018) and extended to geothermal exploration by at ITES par Aquino et al. (2022). Other approaches, such as including the findings from an analysis of petrophysical data by IA techniques, will also be addressed during the Thesis.

A possible work programme could be:
1. Literature review of EM and ERT inversion experiences in the Athabasca Basin.
2. Understanding the algorithms used to forward model ERT and EM data and analysis on their sensitivity to subsurface resistivity variations.
3. Development of joint inversion codes based on the above plus (i) correspondence maps and (ii) petrophysical models.
4. Test of the joint inversion codes on synthetics then case studies on exploration data acquired by Orano and its partners.

The Doctoral Student will have to opportunity to present her/his research findings at regular project meetings and at international conferences and to publish in international journals.

Work Context

GeomIn3D is an Industry Chair funded by Orano and Agence Nationale de la Recherche (ANR). The Chair is hosted by the University of Lorraine and its geophysical component is based at ITES (Institut Terre et Environnement de Strasbourg, University of Strasbourg/CNRS/ENGEES).

The main objective of the Chair is to help reorient the exploration strategy for giant uranium deposits (high grade/high tonnage) in the Athabasca Basin and more generally, to develop new tools for uranium exploration.

ITES has an internationally-recognized expertise in Electrical and EM methods. ITES has all the modelling codes that constitute the building blocks of the joint inversion codes as well as advanced computing facilities (16-core workstations, HPC). Industry-standard mineral exploration software is also available (Oasis Montaj, Maxwell, Geoscience Analyst, Res2-3Dmod).

Must-haves to apply:
- Master's or Engineering degree with a specialization in Geophysics
- Experience in computer code development (Python, C/C++, Fortran, Matlab)
- Experience in ERT, Land EM and/or Airborne EM
- Knowledge of inversion methods
- Fluency in English

Assets:
- Interest in mineral exploration
- Knowledge of geology, especially in basement environment
- Availability for visits to project partners to Nancy, to Chatillon (near Paris) and to Canada

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