187 QUAL I TÉ GÉOPHYSIQUEAPPLIQUÉE © EDP Sciences, 2026 DOI: https://doi.org/10.1051/978-2-7598-3934-6.c905 Conclusion J.-L. Mari and T. Gaillard Geophysical and hydrogeological investigations are essential for aquifer characterization. Drawing on their extensive experience in geophysics applied to the oil and gas sector — as well as in geotechnical and hydrogeological studies — the authors demonstrate how conventional seismic methods, typically used in exploration and reservoir imaging, can be effectively adapted for hydrogeological investigations, particularly in karstified geological formations. The Hydrogeological Experimental Site (HES) of Poitiers, developed for long-term monitoring and experimentation on water and mass transfer processes, has been extensively studied using both hydrogeological and geophysical methods. This book presents an overview of the various field experiments conducted at the site and highlights their respective contributions to the understanding of the karstified Dogger limestone (identical to the supra-Toarcian aquifer) of the Poitou threshold. A 3D seismic survey was designed to acquire a volumetric image with broad horizontal coverage. Structural interpretation revealed a nearly horizontal stratigraphy with a gentle westward dip of approximately one degree, indicating the absence of significant vertical tectonic displacements. In addition to the 3D seismic survey, the HES was also analyzed using pseudo three-dimensional (3-D) Electrical Resistivity Tomography. The 3D seismic volume was then transformed into a pseudo-velocity model using acoustic velocity logs for calibration, and subsequently into a pseudo-porosity model. This model revealed three high-porosity, and presumably water-bearing, layers at depths of 35–40 m, 85–87 m, and 110–115 m — interpreted as karstic horizons. These horizons were confirmed through acoustic logging and borehole
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