151 © EDP Sciences, 2026 DOI: https://doi.org/10.1051/978-2-7598-3934-6.c008 QUAL I TÉ GÉOPHYSIQUEAPPLIQUÉE 8 Hydro-stratigraphic study of the Hydrogeological Experimental Site of Poitiers, France T. Gaillard Objectif and method The Hydrogeological Experimental Site (HES), located near Poitiers (France), was originally established to investigate the role of fracturing in Middle Jurassic limestones. The supra-Toarcian aquifer has been extensively characterized through surface geophysics (Mari et al., 2009), borehole geophysical logging (Mari et al., 2020; Moreau et al., 2026), and numerous downhole investigations conducted by the University of Poitiers (Delay et al., 2004). Early studies demonstrated the absence of major vertical structures such as faults or open vertical fractures. However, the presence of discontinuous sub-horizontal porous horizons has been clearly documented (Bourbiaux et al., 2007; Audouin et al., 2008; Mari et al., 2009; Bodin et al., 2022; Mari et al., 2024). In this paper, these planar features are reinterpreted within the framework of the regional stratigraphic context (Gabilly, 1978; Mourier et al., 1986; Gaillard et al., 2024) and by
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