Electromagnetic velocity inversion using 2-D Maxwell's equations

Wenying Cai*, Fuhao Qin, Gerard T. Schuster

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


We adapt the wave-equation traveltime inversion (WT) method to the reconstruction of the dielectric distribution from cross-well radar traveltime data. The data misfit gradient is computed using finite-difference solutions to the 2-D Maxwell's equations. An advantage of the wave-equation method over ray-tracing radar tomography is that it accounts for scattering and diffusion effects and works well in both resistive and moderately conductive rocks. Comparisons with ray-tracing tomography show that the wave equation method is more robust and accurate when the rock conductivity is larger than .002 S/m. The methods are about equally effective when the conductivity is less than or equal to .001 S/m. The major disadvantage of the wave equation scheme is that it generally requires at least several orders of magnitude more computational time than ray tracing. We also derive the general equation for the waveform radar inversion method, which is closely related to the equations for the WT method and prestack radar migration.

Original languageEnglish (US)
Pages (from-to)1007-1019
Number of pages13
Issue number4
StatePublished - 1996
Externally publishedYes

ASJC Scopus subject areas

  • Geochemistry and Petrology


Dive into the research topics of 'Electromagnetic velocity inversion using 2-D Maxwell's equations'. Together they form a unique fingerprint.

Cite this