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Exploration Geophysics Exploration Geophysics Society
Journal of the Australian Society of Exploration Geophysicists
RESEARCH ARTICLE

B-field probes for downhole magnetometric resistivity surveys

M.B.J. Purss and J.P. Cull

Exploration Geophysics 34(4) 233 - 240
Published: 2003

Abstract

The downhole magnetometric resistivity (DHMMR) method relies on the measurement of low-amplitude (~100 pT), low-frequency (1?4 Hz) magnetic fields arising from galvanic current flow in the Earth. Normal magnetic sensors have been used extensively in surface magnetometric resistivity (MMR) surveys, but equivalent B-field probes have not been generally available for use in standard mineral exploration drillholes. However, recent advances in magnetic sensor design have led to the manufacture of B-field probes, which provide significant advantages over the alternative TEM probes for DHMMR surveys. Synthetic and laboratory examples highlight the differences between data acquired from B-field and TEM probes. Field examples from the Flying Doctor Prospect, near Broken Hill, New South Wales, demonstrate the improved resolution achieved by using a B-field probe for DHMMR surveys.

https://doi.org/10.1071/EG03233

© ASEG 2003

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