A new concept of karst development based on hydrogeology and geophysics

95 5. Geophysical methods and 110 to 115 m. The 85 to 87 m layer is the most porous, with porosities higher than 30 %, which represents the karstic part of the reservoir. Figure 7b shows the seismic pseudo-porosity logs extracted from the 3D block at boreholes M11, M14, M20, and M22. (a) (b) Figure 6 Resistivity log from the 3D velocity block. (a) Comparison between the resistivity log from logging and resistivity log from seismic velocity at boreholes M11 and M14. (b) Resistivity log from seismic velocity at boreholes M11, M14, M20, and M22.

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