Breaks in lithology: Interpretation problems when handling 2D structures with a 1D approximation

Ley-Cooper, A, MacNae, J and Viezzoli, A 2010, 'Breaks in lithology: Interpretation problems when handling 2D structures with a 1D approximation', Geophysics, vol. 75, no. 4, pp. WA179-WA188.


Document type: Journal Article
Collection: Journal Articles

Title Breaks in lithology: Interpretation problems when handling 2D structures with a 1D approximation
Author(s) Ley-Cooper, A
MacNae, J
Viezzoli, A
Year 2010
Journal name Geophysics
Volume number 75
Issue number 4
Start page WA179
End page WA188
Total pages 10
Publisher Society of Exploration Geophysicists
Abstract Most airborne electromagnetic (AEM) data are processed using successive 1D approximations to produce stitched conductivity- depth sections. Because the current induced in the near surface by an AEM system preferentially circulates at some radial distance from a horizontal loop transmitter (sometimes called the footprint), the section plotted directly below a concentric transmitter- receiver system actually arises from currents induced in the vicinity rather than directly underneath. Detection of paleochannels as conduits for groundwater flow is a common geophysical exploration goal, where locally 2D approximations may be valid for an extinct riverbed or filled valley. Separate from effects of salinity, these paleochannels may be conductive if clay filled or resistive if sand filled and incised into a clay host. Because of the wide system footprint, using stitched 1D approximations or inversions may lead to misleading conductivity-depth images or sections.
Subject Geophysics not elsewhere classified
Keyword(s) Laterally Constrained Inversion
Electromagnetic Data
Tem Data
Transient
Frequency
Conductivity
Footprints
DOI - identifier 10.1190/1.3483101
Copyright notice © 2010 Society of Exploration Geophysicists
ISSN 0016-8033
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Citation counts: TR Web of Science Citation Count  Cited 12 times in Thomson Reuters Web of Science Article | Citations
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