| Because of practical problems related to the continuous flow of currents, actual electric logging devices operate with alternating currents instead. However, due to the relatively low frequencies used, this kind of logging systems has been always assumed to operate at zero frequency (electrostatic assumption). In this dissertation, a time harmonic field analysis procedure is implemented to study electric logging systems at their real frequencies of operation and determine the extent of the validity of the electrostatic assumption. Also, the suitability of frequency-based electric logging inverse modeling is studied. In present logging inversion methods, the inversion data set is generated by using the length of the tool in order to vary the depth of investigation. The time harmonic field analysis procedure, on the other hand, allows the use of frequency in order to vary the depth of investigation in a more economical way. |
