Full Waveform Inversion of Transient Electromagnetic Data in the Time Domain

Quasi-seismic imaging is a popular form of electromagnetic technology. In most cases, it considered that will yield more obvious layered characteristics if the response transformed into virtual wave domain. However, time profile cannot effectively show underground structure before migration. this paper, we make an improvement to process wave, by applying full waveform inversion method, with steps detailed as follows: (1) use truncated singular value decomposition method transform transient field. (2) Using FDTD calculate field according resistivity model, then shearlet remove direct wave. (3) We least square equation between and express problem inversion. Next, apply one steepest descent methods—the Marquardt approach—to obtain optimal conductivity information. Finally, synthetic data accuracy rationality proposed in paper.