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Fundamental principles of a new EM tool for in-situ resistivity measurement. 2; Denji yudoho ni yoru gen`ichi hiteiko sokutei sochi no kento. 2

Abstract

In-situ resistivity measuring devices are tested for performance in relation to the principle of focusing. After numerical calculation, it is shown that in the absence of focusing the primary magnetic field will prevail and that changes in the separate-mode component will be difficult to detect in actual measurement because the in-phase component assumes a value far larger than the out-of-phase component. Concerning the transmission loop radius, the study reveals that a larger radius will yield a stronger response and that such will remove the influence of near-surface layers. Two types of devices are constructed, one applying the principle of focusing and the other not, and both are activated to measure the response from a saline solution medium. The results are compared and it is found that focusing eliminates the influence of the primary magnetic field and that it enables the measurement of changes in resistivity of the medium which cannot be detected in the absence of focusing. 3 refs., 9 figs.
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:
Oct 22, 1997
Product Type:
Conference
Report Number:
ETDE/JP-98751022; CONF-9710214-
Reference Number:
SCA: 440700; PA: JP-97:0G4556; EDB-98:075703; SN: 98001944492
Resource Relation:
Conference: 97. SEGJ conference, Butsuri tansa gakkai dai 97 kai (1997 nendo shuki) gakujutsu koenkai, Sapporo (Japan), 22-24 Oct 1997; Other Information: PBD: 22 Oct 1997; Related Information: Is Part Of Proceeding of the 97th (Fall, Fiscal 1997) SEGJ Conference; PB: 371 p.; Butsuri tansa gakkai dai 97 kai (1997 nendo shuki) gakujutsu koenkai koen ronbunshu
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; MEASURING INSTRUMENTS; ELECTROMAGNETIC SURVEYS; ELECTRIC CONDUCTIVITY; FOCUSING; PERFORMANCE TESTING; BENCH-SCALE EXPERIMENTS; BRINES; NUMERICAL ANALYSIS; MAGNETIC FIELDS; TRANSMISSION
OSTI ID:
622726
Research Organizations:
Society of Exploration Geophysicists of Japan, Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE98751022; TRN: JN97G4556
Availability:
Available from Society of Exploration Geophysicists of Japan, 2-18, Nakamagome 2-chome, Ota-ku, Tokyo, (Japan); OSTI as DE98751022
Submitting Site:
NEDO
Size:
pp. 198-202
Announcement Date:

Citation Formats

Noguchi, K, Aoki, H, and Saito, A. Fundamental principles of a new EM tool for in-situ resistivity measurement. 2; Denji yudoho ni yoru gen`ichi hiteiko sokutei sochi no kento. 2. Japan: N. p., 1997. Web.
Noguchi, K, Aoki, H, & Saito, A. Fundamental principles of a new EM tool for in-situ resistivity measurement. 2; Denji yudoho ni yoru gen`ichi hiteiko sokutei sochi no kento. 2. Japan.
Noguchi, K, Aoki, H, and Saito, A. 1997. "Fundamental principles of a new EM tool for in-situ resistivity measurement. 2; Denji yudoho ni yoru gen`ichi hiteiko sokutei sochi no kento. 2." Japan.
@misc{etde_622726,
title = {Fundamental principles of a new EM tool for in-situ resistivity measurement. 2; Denji yudoho ni yoru gen`ichi hiteiko sokutei sochi no kento. 2}
author = {Noguchi, K, Aoki, H, and Saito, A}
abstractNote = {In-situ resistivity measuring devices are tested for performance in relation to the principle of focusing. After numerical calculation, it is shown that in the absence of focusing the primary magnetic field will prevail and that changes in the separate-mode component will be difficult to detect in actual measurement because the in-phase component assumes a value far larger than the out-of-phase component. Concerning the transmission loop radius, the study reveals that a larger radius will yield a stronger response and that such will remove the influence of near-surface layers. Two types of devices are constructed, one applying the principle of focusing and the other not, and both are activated to measure the response from a saline solution medium. The results are compared and it is found that focusing eliminates the influence of the primary magnetic field and that it enables the measurement of changes in resistivity of the medium which cannot be detected in the absence of focusing. 3 refs., 9 figs.}
place = {Japan}
year = {1997}
month = {Oct}
}