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ON THE EFFECTS OF THICKNESS OF THE HALF‐PLANE MODEL IN HLEM INDUCTION PROSPECTING OVER SULPHIDE DYKES IN A HIGHLY RESISTIVE MEDIUM 1
Author(s) -
JOSHI M. S.,
GUPTA O. P.,
NEGI J. G.
Publication year - 1988
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.1988.tb02179.x
Subject(s) - prospecting , conductor , geology , resistive touchscreen , electrical conductor , amplitude , plane (geometry) , mineralogy , hydrogeology , materials science , optics , geometry , composite material , geotechnical engineering , physics , geochemistry , mathematics , engineering , electrical engineering
In the quantitative data interpretation for HLEM induction prospecting, a vertical half‐plane model in an insulating medium is widely employed. For this assumption to be valid, the steeply dipping massive sulphide dykes must have large strike lengths and depth extents, but small thickness. We report investigations, using the laboratory scale‐modelling method, on the response variation of large vertical conductors as the thickness is varied. We conclude that a steeply dipping large dyke can be approximated by a half‐plane model only if its thickness is less than half the skin depth. An inductively thick conductor produces larger amplitudes and relatively higher quadrature compared to a thin conductor, even if both have the same induction number.