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RESISTIVITY AND IP MODELING OF THE THREE‐ARRAY DOWN‐HOLE PROSPECTING TECHNIQUE *
Author(s) -
BUSBY J.P.,
DABEK Z.K.
Publication year - 1986
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.1986.tb00458.x
Subject(s) - borehole , geology , radius , prospecting , gemology , electrical resistivity and conductivity , slab , prolate spheroid , dipole , economic geology , geophysics , polyhedron , mineralogy , geometry , tectonics , physics , engineering geology , seismology , volcanism , geotechnical engineering , mining engineering , computer security , mathematics , quantum mechanics , computer science , classical mechanics
The resistivity and induced polarization responses due to a number of IP targets for a down‐hole three‐array have been calculated numerically. The IP targets are approximated by triangle‐faceted polyhedra; number and size of the facets are limited by the numerical procedure. Despite this limitation a number of profiles have been obtained for a sphere, lens, prolate spheroid and thin dipping slab. The profiles obtained do not differentiate between the shapes of the IP targets, but depend upon the vertical extent of the target within the search‐radius of the borehole. The type curves produced could be of use for preliminary interpretation and in the field for planning the next stages of a geophysical survey. The lateral and vertical search radii of the borehole are increased by the use of such an array. For the bodies used it is estimated that the search radii are extended by 2.0 dipole units.