110 A new concept of karst development based on hydrogeology and geophysics (a) (b) Figure 17 Comparison of the short normal resistivity (Rxo) log and borehole caliper with the optical televiewer (OPTV) image in borehole M07. The karst conduit is clearly identified in the 87–90 m depth interval. Figure 18 Comparison of acoustic, electrical, and optical wall imaging methods in borehole M20. From left to right: acoustic section, velocity log, karst index log, electrical resistivity panel, geological log, and optical wall imagery (OPTV).
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