REMOVAL OF ELECTROMAGNETIC COUPLING EFFECT FROM IP PHASE DATA

Yıl 1991, Cilt: 112 Sayı: 112, 64 - 64, 01.05.1991

İlyas Çağlar

Öz

 Since the electromagnetic (EM) coupling effect causes spurious anomalies on induced polarization (IP) pseudo-section phase
data collected over metallic sulphide mineralization area, it is difficult to evaluate and to interpret as truely of these data. Coupling removal
process by dividing (DAKG) IP pseudo-section data has been developed for to remove this effect on raw phase data. In this process theoretical
earth model considered as has continuously varying conductivity. Apparent resistivity and EM coupling computations have been made
by using mathematical expressions based on this earth model. DAKG process is applied to the real IP phase field data given by recent works
in which used the "Quadratic Extrapolation" (QE) and "Complex Resistivity Interactive" (CRI) techniques. The extension of mineralization
zone, is described as agrees with the results of QE and CRI techniques by interpreting of pseudo-section decoupled phase data obtained from
DAKG process. Hence, it is seen that the DAKG was an useful process like QE and CRI on removing of EM coupling.

Anahtar Kelimeler

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Kaynakça

• Çağlar, İ., 1989, HM Coupling in İP data mcasured on the earth wiıh contınuously varyıng conductivity (Geophysical Trannsaction mecmuasına gönderildi).
• Gray, M.C., 1934, Mutual impcdance of grounded wires lying on the Surface of the earth when the conductivity varies exponentially wiıh depth: Physics 5, 35-37.
• Hallof, P.G., 1974, The İP phase mcasurement and inductive coupling: Gcophysics, 38,650-665.
• Cartwright, l*. A. ve Pelton, W.H., 1979, The use of Phocnix IPV-2 phase İP recciver for discrimination between sulphides and graphite: (preprint) Presented in SHG Annual meeting New Orleans, Louisiana, November 4-8.
• Paul, M.K. ve Banerjee, B., 1970, Electrical potcntials duc to a point source upon models of continuously varying conducüvity: Pure and Applied Gcophy., 80, 220-237.
• Pelton, W.H.; Ward, S.H.; Hallof, P.G.; Sili, W.R. ve Nelson, P.H., 1978, Mineral discrimination and removal of inductive coupling with multifrequcncy İP: Gcophysics, 43, 588-609.
• Stoyer, CH. ve Waiı, J.R., 1977, Resisüvity probing of an "exponentıal" earth with a homogencous overburden: Geoexploration, 15, 11-18.
• System / 360 Scıentific Suhroutıne Package, 1970 IBM Corp.
• Wait, J.R., 1982. Geoelectromagnetism: Academic Press. Inc., 24-29.
• ve Gruszka, T.P., 1986, On electromagnetic coupling "Removal" from induced polarization surveys: Gcoexploration, 24, 21-27.
• Wynn, J.C. ve Zonge, K.L., 1975, HM coupling, its intrinsic value its removal and the cultural coupling problem: Gcophysics, 25, 831-850.
• Zima, L., 1987, The interpretation of rcsıstivity sounding over weathered rocks: Geophysical Transactions 32, 319-332.