11:00 AM - 11:15 AM
[STT47-08] Estimation of seismic anisotropy with azimuth from sonic data by full waveform inversion
Keywords:Seismic Anisotropy, Full Waveform Inversion
In this research, we set model parameters as orientation and dip as well as 5 independent parameters instead of estimating 21 parameters directly under a hypothesis that the stable solution could be obtained. We attempt to estimate these parameters by full waveform strategy because azimuthal anisotropy influences the waveform. Low computational costs by efficient parameterization technique make it possible to work on 3D sonic logging model. Since one of the crucial problems of FWI is the predicted model would be possible to converge to local minimum as the number of parameters increases, the small number of unknowns in the proposed strategy could play a key role to deal with complex anisotropy. As a result, all elements come close to true values by full waveform inversion process. Our results suggest that the proposed parameterization strategy and FWI have an advantage over the conventional methods in terms of accuracy and stability.