B-Field Probes for Downhole Magnetometric Resistivity Surveys

Matthew B.J. Purss; James P. Cull

doi:10.1071/EG03233

ISSN: 0812-3985
E-ISSN: 1834-7533

B-Field Probes for Downhole Magnetometric Resistivity Surveys
Authors Matthew B.J. Purss and James P. Cull
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 34, Issue 4, Sep 2003, p. 233 - 240
DOI: https://doi.org/10.1071/EG03233
- Received: 11 Nov 2003
- Accepted: 27 May 2003
- Published online: 01 Sep 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.

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References

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Article Type: Research Article

Keyword(s): B-field probes; Downhole Magnetometric Resistivity (DHMMR); Fluxgate Magnetometer; TEM probes

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B-Field Probes for Downhole Magnetometric Resistivity Surveys

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