Electromagnetic fields in boreholes-measurements and theory in three dimensions
(1990) In Technical Report LUTEDX/(TEAT-7008)/1-17/(1990)- Abstract
- A comparison between experimental measurements of the electromagnetic
field in boreholes and a mathematical model is made. The transmitting antenna
is a rectangular wire loop on the ground and the three orthogonal
components of the magnetic field are measured below the ground in the borehole.
In the mathematical model the ground is assumed to be a stratified half
space with a rectangular wire antenna on the ground. Excellent agreement
was found between the experimental results and the theoretical ones in most
cases and where deviations were found, the assumption of a stratified ground
was inaccurate due to present conductive inhomogeneities. The method... (More) - A comparison between experimental measurements of the electromagnetic
field in boreholes and a mathematical model is made. The transmitting antenna
is a rectangular wire loop on the ground and the three orthogonal
components of the magnetic field are measured below the ground in the borehole.
In the mathematical model the ground is assumed to be a stratified half
space with a rectangular wire antenna on the ground. Excellent agreement
was found between the experimental results and the theoretical ones in most
cases and where deviations were found, the assumption of a stratified ground
was inaccurate due to present conductive inhomogeneities. The method presented
in this paper is capable of determining an ore body within a radius of
100 m from the borehole. The position (direction and distance) of the target
can be estimated from the measurements in the borehole. The impact on
the economical effectiveness of a drilling programme is considerable when a
prediction of the location of additional boreholes can be made. In the case of
reconnaissance drilling of a geological structure or trend the distance between
adjacent boreholes can be considerably enlarged. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/530179
- author
- Malmqvist, Lennart ; Pantze, Robert ; Kristensson, Gerhard LU and Karlsson, Anders LU
- organization
- publishing date
- 1990
- type
- Book/Report
- publication status
- published
- subject
- in
- Technical Report LUTEDX/(TEAT-7008)/1-17/(1990)
- pages
- 17 pages
- publisher
- Department of Electromagnetic Theory, Lund Institute of Technology
- report number
- TEAT-7008
- language
- English
- LU publication?
- yes
- id
- 084d40e7-230f-4b6a-b57a-36cf85b5fb77 (old id 530179)
- date added to LUP
- 2016-04-04 14:11:47
- date last changed
- 2018-11-21 21:18:51
@techreport{084d40e7-230f-4b6a-b57a-36cf85b5fb77,
abstract = {{A comparison between experimental measurements of the electromagnetic<br/><br>
field in boreholes and a mathematical model is made. The transmitting antenna<br/><br>
is a rectangular wire loop on the ground and the three orthogonal<br/><br>
components of the magnetic field are measured below the ground in the borehole.<br/><br>
In the mathematical model the ground is assumed to be a stratified half<br/><br>
space with a rectangular wire antenna on the ground. Excellent agreement<br/><br>
was found between the experimental results and the theoretical ones in most<br/><br>
cases and where deviations were found, the assumption of a stratified ground<br/><br>
was inaccurate due to present conductive inhomogeneities. The method presented<br/><br>
in this paper is capable of determining an ore body within a radius of<br/><br>
100 m from the borehole. The position (direction and distance) of the target<br/><br>
can be estimated from the measurements in the borehole. The impact on<br/><br>
the economical effectiveness of a drilling programme is considerable when a<br/><br>
prediction of the location of additional boreholes can be made. In the case of<br/><br>
reconnaissance drilling of a geological structure or trend the distance between<br/><br>
adjacent boreholes can be considerably enlarged.}},
author = {{Malmqvist, Lennart and Pantze, Robert and Kristensson, Gerhard and Karlsson, Anders}},
institution = {{Department of Electromagnetic Theory, Lund Institute of Technology}},
language = {{eng}},
number = {{TEAT-7008}},
series = {{Technical Report LUTEDX/(TEAT-7008)/1-17/(1990)}},
title = {{Electromagnetic fields in boreholes-measurements and theory in three dimensions}},
url = {{https://lup.lub.lu.se/search/files/6303135/624838.pdf}},
year = {{1990}},
}