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Geological Society, London, Special Publications; 1998; v. 131; p. 287-303;
DOI: 10.1144/GSL.SP.1998.131.01.18
© 1998 Geological Society of London

Structural, Tectonic and Sedimentary Issues

Application of FMS images in the Ocean Drilling Program: an overview

M. A. Lovell1, P. K. Harvey1, T. S. Brewer1, C. Williams1, P. D. Jackson2 & G. Williamson1

1 Leicester University Borehole Research, Geology Department, Leicester University, LE1 7RH, UK
2 British Geological Survey, Keyworth, Nottingham NG12 5GG, UK

Piecing together the evolution of the ocean basins increasingly relies on the integration of data from both recovered core and downhole measurements. This task is often complicated by the limited amount of core recovered by the Ocean Drilling Program (ODP) and the lack of understanding of the downhole data. The availability of downhole electrically based images since ODP Leg 126 in 1989 provides scientists with the visual means of examining the nature of the subsurface, and for tying disparate core to the continuous downhole data. These Formation MicroScanner (FMS) images are unfortunately based on a relatively crude resistivity measurement which provides the interpreter with only an estimate of the resistivity of the rock but, where there are variations in resistivity which correspond to variations in fabric or structure, the measurement response is often sufficient to provide a detailed visual record. Scientists participating in the ODP have explored the use of these images in tackling a wide range of problems from volcanic and sediment stratigraphy to structure and tectonic applications. The determination of core orientation and the mapping of intervals where core recovery is incomplete in particular provide the geologist with a means of carrying out field studies based on borehole and core observations which were previously unthinkable. This paper aims to provide a brief introduction to this subject, and in reviewing some of the principal results to date, illustrates the use of downhole FMS images in the ODP.





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