Electromagnetic well-logging tools have been subject of interest for many decades due to their applications in oil exploration. In order to obtain accurate formation evaluation, a wide variety of numerical methods have been developed on Computational Electromagnetics. The high cost in terms of computational time and resources of these methods for the spatial discretization procedure is a negative point of these traditional methods. In this work, we will explore new semi-analytical approaches to analyze the propagation of electromagnetic fields in anisotropic media comprising planar layers. We will present a mathematical formulation for the electromagnetic fields due to a solenoid source in terms of a sum of modal eigenfunctions. The proposed method allows the analysis of geophysical scenarios similar to those of the Brazilian Pre-Salt, where high conductivity carbonate rocks are predominant. In addition, the effect of pre- and post-salt formations on electromagnetic waves can be easily incorporated into our model. We will present numerical validation results, which demonstrate the potential of the approach proposed in this work to model geophysical sensors in a computationally robust and efficient way.