Three-dimensional controlled source electromagnetic responses of an electrically conductive anomaly and a magnetically permeable anomaly

Abstract

The controlled source electromagnetic (CSEM) responses can be affected by both conductive and permeable heterogeneities. Understanding of CSEM response due to conductive and permeable structure is very important not only for the inverse modeling of both parameters also for the design of survey parameters. We, in this research, present a three-dimensional CSEM edge-based finite element modeling algorithm which can accommodate conductive and permeable structure. The use of a direct solver secures a numerical stability even for a high magnetic permeable anomaly. The algorithm was verified against one-dimensional solution for conductive and permeable structure. With the developed algorithm, three-dimensional responses due to a conductive anomaly and a permeable anomaly were calculated and demonstrated on vector plots. The responses on each model will be analyzed using the integral equation which can give more intrinsic understanding than the differential equation.