Premium
EM AND IP RESPONSE OF A STEEL WELL CASING FOR A FOUR‐ELECTRODE SURFACE ARRAY. PART II: NUMERICAL RESULTS *
Author(s) -
WILLIAMS J. T.,
WAIT J. R.
Publication year - 1985
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.1365-2478.1985.tb00776.x
Subject(s) - casing , induced polarization , geology , electrical resistivity and conductivity , polarization (electrochemistry) , dipole , cathodic protection , homogeneous , electrode , mineralogy , electrochemistry , geophysics , electrical engineering , chemistry , thermodynamics , physics , engineering , organic chemistry
A bstract Some numerical results for the apparent resistivity of a homogeneous half space containing a vertical steel well casing as measured by a dipole‐dipole array are presented. The basic model includes the electromagnetic and induced polarization effects by allowing for frequency dependent eddy currents and an electrochemical boundary of the well casing. It is shown that the well casing produces an apparent complex resistivity response that could be mistaken for an induced polarization anomaly existing above a hydrocarbon deposit. This response of the well casing is strongly dependent on frequency.