3-D Modeling and Explicit Fréchet Derivative of the Crosswell Electromagnetic Measurement Using the Field-Based Secondary-Field Finite-Volume Method (opens in new tab)

In this article, we implement the field-based secondary-field 3-D finite-volume method (FVM) and the rapid direct method (RDM) of explicit Fréchet derivative for the crosswell electromagnetic (EM) measurement. The EM fields in the 3-D formation are decomposed into the background fields from the layered vertical transverse isotropy (VTI) formation and the secondary fields scattered by local anomalies. The 3-D scattered current density excited by each transmitter in local anomalies is discretiz...