13 QUAL I TÉ GÉOPHYSIQUEAPPLIQUÉE © EDP Sciences, 2026 DOI: https://doi.org/10.1051/978-2-7598-3934-6.c903 The authors Thierry Gaillard Thierry Gaillard is a hydrogeologist trained at the Universities of Bordeaux (ENSEGID) and Jussieu (Paris-Sorbonne). He has spent his career in consulting companies, and since 2017, he has been the CEO of CPGF-HORIZON. Alongside his professional activities, he is an active member of the French chapter of the International Association of Hydrogeologists (IAH) and of several other associations (Association des Géologues du Bassin Parisien, Aquassistance, Société géologique de France). He has worked in France and in several African countries as a consultant or with NGOs (Bénin, Togo, Ivory Coast, Senegal, Niger, Morocco). Email: tgaillard@cpgf-horizon.fr Jean-Luc Mari Jean-Luc Mari is a geophysicist with a distinguished career in applied geosciences. A graduate of the Institut de Physique du Globe de Strasbourg and IFP School (Petroleum Geosciences, major in Geophysics, 1978), he joined IFP Energies Nouvelles in 1979 as a research engineer in the Geophysics Department. He led and contributed to key research projects in high-resolution seismic imaging, reservoir monitoring, and borehole tool development, in collaboration with industrial partners such as GDF-Suez, CGG, Total, and ELF Aquitaine.
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