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Fundamental principles of a new EM tool for in-situ resistivity measurement; Denji yudoho ni yoru den`ichi hiteiko sokutei sochi no kento

Abstract

For the purpose of measuring in-situ resistivity without contact with the rock, a study was made about a measuring device using electromagnetic induction. This measuring device has two concentric transmission loops and a receiving point at the center of the loops, and performs focusing by canceling the primary magnetic field at the receiving point. Using this device, a trial was made to eliminate the influence of surface undulation. In the model calculation, response was calculated after the structure with a heavily undulated ground surface was replaced by a two-layer structure with the first layer provided with a higher resistivity. In the model, the first layer had a resistivity of 10000 Ohm m, and the second layer 1000 Ohm m. Using the ratio between the transmission loop radii as a parameter, relationship with the thickness of the first layer was studied, and it was found that the sensitivity to the second layer resistivity increases when the inner and outer loops are nearer to each other in terms of radius and that this eliminates the influence near the surface layer. A decision needs to fall within a scope assuring good reception because response intensity decreases as the ratio between the transmission loop  More>>
Authors:
Noguchi, K; Aoki, H; [1]  Saito, A [2] 
  1. Waseda University, Tokyo (Japan). School of Science and Engineering
  2. Mitsui Mineral Development Engineering Co. Ltd., Tokyo (Japan)
Publication Date:
May 01, 1996
Product Type:
Conference
Report Number:
CONF-9605233-
Reference Number:
SCA: 440700; PA: NEDO-96:913483; EDB-96:172462; SN: 96001687090
Resource Relation:
Conference: 94. SEGJ (The Society of Exploration Geophysicists of Japan) Conference, Butsuri tansa gakkai dai 94 kai (1996 nendo shunki) gakujutsu koenkai, Tokyo (Japan), 15-17 May 1996; Other Information: PBD: May 1996; Related Information: Is Part Of Proceedings of the 94th SEGJ (The Society of Exploration Geophysicists of Japan) Conference; PB: 475 p.; Butsuri tansa gakkai dai 94 kai (1996 nendo shunki) gakujutsu koenkai koen ronbunshu
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; ELECTROMAGNETIC SURVEYS; MEASURING INSTRUMENTS; ELECTRIC CONDUCTIVITY; ROCK BEDS; TRANSMISSION; FOCUSING; MAGNETIC FIELDS; GEOLOGIC MODELS; COMPUTER CALCULATIONS; PARAMETRIC ANALYSIS
OSTI ID:
395520
Research Organizations:
Society of Exploration Geophysicists of Japan, Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE97709027; TRN: 96:913483
Availability:
Available from The Society of Exploration Geophysicists of Japan, 2-18, Nakamagome 2-chome, Ota-ku, Tokyo, Japan; OSTI as DE97709027
Submitting Site:
NEDO
Size:
pp. 240-244
Announcement Date:
Dec 02, 1996

Citation Formats

Noguchi, K, Aoki, H, and Saito, A. Fundamental principles of a new EM tool for in-situ resistivity measurement; Denji yudoho ni yoru den`ichi hiteiko sokutei sochi no kento. Japan: N. p., 1996. Web.
Noguchi, K, Aoki, H, & Saito, A. Fundamental principles of a new EM tool for in-situ resistivity measurement; Denji yudoho ni yoru den`ichi hiteiko sokutei sochi no kento. Japan.
Noguchi, K, Aoki, H, and Saito, A. 1996. "Fundamental principles of a new EM tool for in-situ resistivity measurement; Denji yudoho ni yoru den`ichi hiteiko sokutei sochi no kento." Japan.
@misc{etde_395520,
title = {Fundamental principles of a new EM tool for in-situ resistivity measurement; Denji yudoho ni yoru den`ichi hiteiko sokutei sochi no kento}
author = {Noguchi, K, Aoki, H, and Saito, A}
abstractNote = {For the purpose of measuring in-situ resistivity without contact with the rock, a study was made about a measuring device using electromagnetic induction. This measuring device has two concentric transmission loops and a receiving point at the center of the loops, and performs focusing by canceling the primary magnetic field at the receiving point. Using this device, a trial was made to eliminate the influence of surface undulation. In the model calculation, response was calculated after the structure with a heavily undulated ground surface was replaced by a two-layer structure with the first layer provided with a higher resistivity. In the model, the first layer had a resistivity of 10000 Ohm m, and the second layer 1000 Ohm m. Using the ratio between the transmission loop radii as a parameter, relationship with the thickness of the first layer was studied, and it was found that the sensitivity to the second layer resistivity increases when the inner and outer loops are nearer to each other in terms of radius and that this eliminates the influence near the surface layer. A decision needs to fall within a scope assuring good reception because response intensity decreases as the ratio between the transmission loop radii approaches 1. 3 refs., 11 figs.}
place = {Japan}
year = {1996}
month = {May}
}