Two-dimensional finite element numerical simulation of an axially symmetric continuous electrical model of excited electrical logging
Excitation logging is a method in which the electrode arrangement is placed in the borehole for detection.Be-cause the electrode arrangement is close to the target body,it strengthens the observed anomalous signal and can better deline-ate the burial depth of the target body.In order to improve the accuracy of radical logging orthorectification and facilitate the optimal design of the electrode arrangement of the radical logging,this paper investigates the two-dimensional finite element numerical simulation method of the radical logging curve in the axisymmetric continuous electrical medium model.Firstly,the axisymmetric coordinate system derives the side value problem and the variational problem satisfied by the anomalous potential of the steady current excitation.Then,the theoretical formulation of the two-dimensional finite element numerical simulation of the excitation logging curve is derived based on the axisymmetric continuous dielectric model.On this basis,the excitation logging's two-dimensional finite element simulation program is prepared,which can be used to simulate the excitation logging curve of the two-pole,three-pole,and four-pole observation devices.Finally,the correctness of the program is checked by modeling examples,and the effects of different grid cell dissection scales on the morphological characteristics of the radical log-ging curve and the response characteristics of the logging curve with different observation devices and different pole distances are analyzed.The research in this paper provides a favorable auxiliary tool for the design of electrode arrangement of the excita-tion logging.
excitation loggingaxisymmetric continuous electrical modelanomalous potentialfinite unit method
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