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Field Evaluation of a Slim‐Hole Borehole Induction Tool
Author(s) -
Taylor Kendrick C.,
Hess John W.,
Mazzela Aldo
Publication year - 1989
Publication title -
groundwater monitoring and remediation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 47
eISSN - 1745-6592
pISSN - 1069-3629
DOI - 10.1111/j.1745-6592.1989.tb01125.x
Subject(s) - borehole , conductivity , geology , electrical resistivity and conductivity , calibration , field (mathematics) , mineralogy , materials science , geotechnical engineering , electrical engineering , physics , engineering , mathematics , quantum mechanics , pure mathematics
The Geonics EM‐39 borehole induction tool was field tested to evaluate its performance under controlled conditions. The effects of temperature changes and borehole fluids were found to be negligible under most conditions. The instrument can be calibrated in large bodies of water of known electrical conductivity. When properly calibrated, the ± 5 percent accuracy claimed by the manufacturer is obtainable. A geologic unit must be at least 4m thick for the electrical conductivity of the unit to be accurately measured. Geologic units thinner than 4m thick can be detected if the conductivity contrast to adjacent units is sufficiently large.