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3-D modeling of surface, borehole, and airborne EM methods; Chijo konai kuchu denjiho no sanjigen modeling

Abstract

Three-dimensional modelling methods using the difference method and finite element method are applied to the simulations respectively of the surface electromagnetic method, borehole electromagnetic method, and airborne electromagnetic method, and they are compared with each other in point of accuracy and practicality. The object of calculation in this study is a 3-D model which is a semi-finite medium 100 ohm/m in resistivity that contains a rectangular parallelopiped 1 ohm/m in resistivity. A vertical magnetic dipole is installed on the surface in the surface electromagnetic method, providing a vertical magnetic field on the surface. In the borehole electromagnetic method, a vertical magnetic dipole is placed in a borehole and the resultant vertical magnetic field is measured at a station in another borehole. In the airborne electromagnetic method, the flight level is 20m high and the distance between the source and the receiving point is 10m. The results of calculation all agree well with the results of calculation previously made known. When the difference method and finite element method are compared, it is found that the finite element method requires calculation time and memory capacity two to three times more than the difference method. 5 refs., 9 figs.
Authors:
Sasaki, Y [1] 
  1. Kyushu University, Fukuoka (Japan). Faculty of Engineering
Publication Date:
Oct 22, 1997
Product Type:
Conference
Report Number:
ETDE/JP-98751022; CONF-9710214-
Reference Number:
SCA: 440700; 990300; PA: JP-97:0G4553; EDB-98:075731; SN: 98001944489
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; 99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; ELECTROMAGNETIC SURVEYS; AERIAL SURVEYING; BOREHOLES; MATHEMATICAL MODELS; THREE-DIMENSIONAL CALCULATIONS; FINITE DIFFERENCE METHOD; FINITE ELEMENT METHOD; COMPUTERIZED SIMULATION; ACCURACY; ELECTRIC CONDUCTIVITY; MAGNETIC DIPOLES
OSTI ID:
622722
Research Organizations:
Society of Exploration Geophysicists of Japan, Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE98751022; TRN: JN97G4553
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. 183-187
Announcement Date:

Citation Formats

Sasaki, Y. 3-D modeling of surface, borehole, and airborne EM methods; Chijo konai kuchu denjiho no sanjigen modeling. Japan: N. p., 1997. Web.
Sasaki, Y. 3-D modeling of surface, borehole, and airborne EM methods; Chijo konai kuchu denjiho no sanjigen modeling. Japan.
Sasaki, Y. 1997. "3-D modeling of surface, borehole, and airborne EM methods; Chijo konai kuchu denjiho no sanjigen modeling." Japan.
@misc{etde_622722,
title = {3-D modeling of surface, borehole, and airborne EM methods; Chijo konai kuchu denjiho no sanjigen modeling}
author = {Sasaki, Y}
abstractNote = {Three-dimensional modelling methods using the difference method and finite element method are applied to the simulations respectively of the surface electromagnetic method, borehole electromagnetic method, and airborne electromagnetic method, and they are compared with each other in point of accuracy and practicality. The object of calculation in this study is a 3-D model which is a semi-finite medium 100 ohm/m in resistivity that contains a rectangular parallelopiped 1 ohm/m in resistivity. A vertical magnetic dipole is installed on the surface in the surface electromagnetic method, providing a vertical magnetic field on the surface. In the borehole electromagnetic method, a vertical magnetic dipole is placed in a borehole and the resultant vertical magnetic field is measured at a station in another borehole. In the airborne electromagnetic method, the flight level is 20m high and the distance between the source and the receiving point is 10m. The results of calculation all agree well with the results of calculation previously made known. When the difference method and finite element method are compared, it is found that the finite element method requires calculation time and memory capacity two to three times more than the difference method. 5 refs., 9 figs.}
place = {Japan}
year = {1997}
month = {Oct}
}