Efficient computation of the EM field due to a bipole in hydrocarbon exploration

The numerical mode matching (NMM) method is employed to compute the electromagnetic field due to a bipole in an orthogonal-plano-cylindrically layered (OPCL) medium which consists of materials stratified planarly and layered cylindrically in the orthogonal directions. We derive the formulas to compute the excitation vectors due to a bipole located at any position with an arbitrary orientation. Finally, the EM field due to a bipole in a five-layer borehole model is presented to demonstrate the efficiency and accuracy of this method.