119 © EDP Sciences, 2026 DOI: https://doi.org/10.1051/978-2-7598-3934-6.c006 QUAL I TÉ GÉOPHYSIQUEAPPLIQUÉE Borehole electrical panels: an experiment M. Moreau, P. Brunel and J.-L. Mari The Hydrogeological Experimental Site (HES) has been the subject of several studies over the past 20 years (Gaillard, 2026a). Multi-borehole logging investigations were carried out at the HES site (Audouin et al., 2008). In this chapter, we focus on the potential of vertical electrical panels installed in five open boreholes (recorded by CPGF Horizon in 2021), combined with optical wall imaging (carried out by SOLEO Mesures et Développements in 2005 and SEMM Logging in 2006), to detect karst networks. In 2021, as part of the KARST’OGENE project, CPGF Horizon carried out measurement campaigns on the HES. These investigations included hydrogeological tracer studies (see Chapter 7, Boulais et al. 2026) and vertical electrical panels. The objectives of the KARST’OGENE project were as follows: 1. to test and validate measurement methods and equipment on a well-documented hydrogeological site, with a view to applying them to applied hydrogeology projects; 2. to verify mass transfer between the various horizontal karst levels intersected by the HES boreholes, using convergent radial tracers. Following the 3D seismic survey, Mari and Porel (2008) identified 3 main porous layers at depths of 35-40, 85-87, and 110-115 m that turned out to be karstic levels. 6
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