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Sedimentology and Stratigraphic Correlation |
Geology Department, The University, Southampton SO9 5NH, UK
A thick sedimentary section was penetrated at three sites in the West Central Pacific during the Ocean Driling Program (ODP) Leg 129. Although average core recovery ranged from 17.3 to 29.5%, recovery in some intervals falls as low as 0–5%. Furthermore, the recovered portion of the core is conventionally assigned to the topmost part of the cored interval, although this is now known to be incorrect in most instances in consolidated parts of the section. These drawbacks have led to incomplete and even erroneous sedimentological interpretations. High-resolution electrical (Formation MicroScanner) images of the borehole obtained by scanning the borehole wall with arrays of small electrodes pressed against the borehole surface can provide:
Examples of these applications of the FMS images to the poorly recovered ODP Leg 129 cores are presented. The use of FMS logging has widespread application in any borehole where conventional cores have not been taken or where core recovery is limited. However, log calibration with core samples is essential.
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  S. E. Prensky Advances in borehole imaging technology and applications Geological Society, London, Special Publications, 1999; 159: 1 - 43. [Abstract] [PDF]
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