112 A new concept of karst development based on hydrogeology and geophysics logging (Karstic index), ambient seismic noise and VSP (VSP flow index), borehole wall imaging (OPTV optical televiewer) and flow measurement in dynamic conditions. Combined analyses of geophysical and hydrogeological data can be done locally at wells or on a larger scale using 3D seismic data. These studies are done to detect water-producing levels in wells and to establish probable karst conduit networks. An integrated approach for the identification of effective three-dimensional (3D) discrete karst conduit networks conditioned on tracer tests and geophysical data (3D velocity block, Fig. 5a) has been developed (Bodin et al., 2022). Figure 19 Borehole M20: Detection of karstic levels and flows by acoustic logging (karstic index), VSP (VSP flow index), borehole wall imaging (OPTV) and flow measurement under dynamic conditions.
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