Surface nuclear magnetic resonance signal contribution in conductive terrains

Don Hunter; Anton Kepic

doi:10.1071/EG05073

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

Surface nuclear magnetic resonance signal contribution in conductive terrains
Authors Don Hunter^a and Anton Kepic^a
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^a Department of Exploration Geophysics Curtin University, GPO Box U1987, PERTH, WA, 6845, Phone: (08) 6436 8680, Facsimile: (08) 9266 3407, Email: [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 36, Issue 1, Mar 2005, p. 73 - 77
DOI: https://doi.org/10.1071/EG05073
- Received: 01 Dec 2004
- Accepted: 01 Aug 2004
- Published online: 01 Mar 2005

Abstract

To correctly invert and interpret Surface Nuclear Magnetic Resonance (SNMR) data collected in conductive terrains, an accurate estimate of subsurface conductivity structure is required. Given such an estimate, it would be useful to determine, before conducting an SNMR sounding, whether or not the conductivity structure would prevent groundwater being detected. Using SNMR forward modelling, we describe a method of determining the depth range from which most of the SNMR signal originates, given a model of subsurface conductivity structure

We use the method to estimate SNMR depth penetration in a range of halfspace models and show that for conductive halfspaces (< 10Ωm) the depth of penetration is less than 50 m. It is also shown that for these halfspaces, increasing coincident loop size does not significantly improve depth penetration. The results can be used with halfspace approximations of more complicated 1D conductivity structures to give a reasonable estimate of the depth range over which signal is obtainable in conductive terrains.

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References

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Article Type: Research Article

Keyword(s): detection depth; MRS; SNMR

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Surface nuclear magnetic resonance signal contribution in conductive terrains

Abstract

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