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Analysis of Complex Apparent Resistivity Data Conjugating Spectral Induced Polarization and Electromagnetic Coupling
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 2nd Conference on Geophysics for Mineral Exploration and Mining, Sep 2018, Volume 2018, p.1 - 5
Abstract
Electromagnetic coupling (EMC) between current and potential electrodes is a phenomenon which yields a dependence of the modullus and the phase of electrical resistivity with frequency. EMC plays a dual role in geophysical surveys because it is a source of spurious anomalies in spectral induced polarization (SIP) data ( Millett, 1967 ) but it helps to improve the analysis of the variation of electrical parameters in controlled source electromagnetic (CSEM) data ( Wynn and Zonge, 1977 ).
The characterization of EMC as a noise caused the emergence of several techniques of minimization and removal of its effect in SIP measurements both in time and frequency domains ( Çaglar, 2000 ; Fullagar et al., 2000 ; Xiang et al., 2002 ). Furthermore, the removal of its effect may allow the analysis of the role of SIP in mineral discrimination ( Sampaio et al., 1998 ).