Reflection Full Waveform Inversion Using a Modified Phase Misfit Function
C. Cui, Y.D. Guo, J.P. Huang and Z.C. Li
Event name: 79th EAGE Conference and Exhibition 2017
Session: FWI I
Publication date: 12 June 2017
Info: Extended abstract, PDF ( 830.17Kb )
Price: € 20
RFWI is capable of providing the correct travel time information and guaranteeing the success of FWI or migration. However, the conventional data-fitting RFWI suffers from the strong nonlinearity because of the lack of low frequency data and the complexity of amplitude. The separation of phase and amplitude information makes RFWI behaving in a more linear way. However, the traditional phase calculation has a severe wrapping issue. Thus we propose a RFWI objective function with a modified instantaneous phase calculation. With the utilization of envelope information, the proposed misfit function avoids the wrapping issue and provides wider global minimum basin. Numerical test on a portion of Sigsbee 2A model verifies that, compared with conventional methods, the combination of modified phase based RFWI and conventional FWI reveals the velocity model with high accuracy.