An assessment of the accuracy of boundaries picked by AEM sounding, with application to mineral exploration and salinity mapping

Macnae, J, Grant, A and Lane, R 2003, 'An assessment of the accuracy of boundaries picked by AEM sounding, with application to mineral exploration and salinity mapping', Exploration Geophysics, vol. 34, pp. 41-45.


Document type: Journal Article
Collection: Journal Articles

Title An assessment of the accuracy of boundaries picked by AEM sounding, with application to mineral exploration and salinity mapping
Author(s) Macnae, J
Grant, A
Lane, R
Year 2003
Journal name Exploration Geophysics
Volume number 34
Start page 41
End page 45
Total pages 4
Publisher Australian Society of Exploration Geophysicists
Abstract The vertical distribution of conductivity in the ground exhibits varied characteristics. Abrupt changes may occur at geological unconformities, and gradational changes are common with saturation and salinity gradients, or with clay content through the weathering profile. This paper describes a rapid, automatic method of picking probable vertical locations for abrupt changes in conductivity using the conductance-depth curve derived in an approximate conductivity-depth transform of airborne EM data. The method is based on identifying the location of slope changes on a cumulative conductance vs. depth plot. The location of probable layer boundaries shows good agreement with synthetic data when the conductance contrast is adequate and boundaries are well separated. Correspondence of structures picked on separate x and z components increases the confidence of interpretation on a conductivity-depth image (CDI). In field data, the quantitative usefulness of including probable layer boundaries on a CDI display is yet to be determined, qualitatively however it appears to provide very useful information to aid in the assessment of CDI section accuracy. It is also very useful where conductivity contrasts are poorly imaged by the limitations of colour bar or greyscale choice.
Subject Electrical and Electromagnetic Methods in Geophysics
DOI - identifier 10.1071/EG03041
ISSN 0812-3985
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