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Geological Society, London, Special Publications; 1992; v. 65; p. 265-274;
DOI: 10.1144/GSL.SP.1992.065.01.20
© 1992 Geological Society of London

Fractures and Stress

Enhanced resolution resistivity logging for fracture studies

P. D. Jackson1, S. Shedlock1, J. Willis-Richards2 & A. S. P. Green2

1 British Geological Survey, Keyworth, Nottingham NG12 5GG, UK
2 CSM Geothermal Energy Project, Rosemanowes Quarry, Herniss, Penryn, Cornwall TR10 9DU, UK

Electrical resistivity techniques have been developed which have a higher resolution than standard logging methods. The paper describes an enhanced focusing technique which is shown to increase the resolution to an extent where individual fractures can be identified within what appears to be a single fracture from conventional focused logs. The measurements were made in the Carnmenellis Granite and the problems of making resistivity measurements in this resistive environment are discussed in terms of electric current flow in the borehole which is controlled by the proximity of connected fractures and the resistivity contrast between the fluid and the formation.