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Electromagnetic fields in boreholes-measurements and theory in three dimensions

Författare:
Publiceringsår: 1990
Språk: Engelska
Sidor:
Publikation/Tidskrift/Serie: Technical Report LUTEDX/(TEAT-7008)/1-17/(1990)
Volym: TEAT-7008
Dokumenttyp: Rapport
Förlag: [Publisher information missing]

Sammanfattning

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.

Nyckelord

  • Electrical Engineering, Electronic Engineering, Information Engineering
  • Other Electrical Engineering, Electronic Engineering, Information Engineering

Övriga

Published
  • Electromagnetic theory-lup-obsolete

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