94 A new concept of karst development based on hydrogeology and geophysics boreholes M11, M14, M20, and M22, which highlight a strong resistivity decrease in the 80–90 m depth interval. Resistivity values were then converted into porosity values, using Archie’s law (1942). The resulting 3D seismic pseudo-porosity block (Fig. 7a) revealed three high-porosity layers, at depths of 35 to 55 m, 85 to 87 m, (a) (b) Figure 5 3D seismic imaging. (a) 3D seismic velocity model from 35 to 130 m below the ground surface. Modified after Bodin et al. 2022. (b) Velocity log extracted from the 3D block at borehole locations: M11, M14, M20, and M22.
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