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IntroductionElectrical conductivity of a geological formation may vary in different directions depending on the formation's properties. This type of directional property of conductivity gives rise to electrical anisotropy (Maillet, 1947). Ignoring the electrical anisotropy of a geological formation or assuming that the formation is isotropic may yield to a misleading interpretation (Nguyen et al., 2007;Wiese et al., 2009;Greenhalgh et al., 2010).Electrical anisotropy detection in the field can be determined by using a square array, since the square array is more sensitive to electrical anisotropy in a geological formation than the most commonly used Schlumberger