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Last name: GHOLAMI
First name: A.
International audience
Wavefield Reconstruction Inversion (WRI) extends the linear regime of Full Waveform Inversion (FWI) by relaxing the wave equation with a feedback term to the data during wavefield simulation before updating the subsurface model by minimizing the source residuals this relaxation generates. Wavefield reconstruction and parameter estimation are...
International audience
International audience
Full-waveform inversion (FWI) is a waveform matching procedure, which can provide a subsurface model with a wavelength-scale resolution. However, this high resolution makes FWI prone to cycle skipping, which drives the inversion to a local minimum when the initial model is not accurate enough. Other sources of non-linearities and ill-posedness...
International audience
Full waveform inversion (FWI) has recently received lots of attention for microseismic event characterization. However, FWI with unknown sources becomes severely underdetermined, hence requiring strong prior information. The frequency-domain wavefield inversion method (WRI) has shown promising results to mitigate the FWI nonlinearity generated...
Classical full waveform inversion (FWI) is an unconstrained data fitting/parameter estimation problem where the exact solution of the wave equation is enforced in the objective function, leading to highly non-linear problem prone to cycle skipping. To extend the linear regime of FWI, the wavefield reconstruction inversion (WRI) computes...
Full waveform inversion (FWI) is a nonlinear waveform matching procedure which can provide high-resolution subsurface models. However, viscous effects must be taken into account in attenuating media to exploit the full potential of FWI. In the frequency domain, attenuation is implemented in the time-harmonic wave equation with complex-valued...
Full waveform inversion (FWI) is a nonlinear waveform matching procedure, which suffers from cycle skipping when the initial model is not kinematically accurate enough. To mitigate cycle skipping, wavefield reconstruction inversion (WRI) extends the inversion search space by computing wavefields with a relaxation of the wave equation in order...
Accurate subsurface imaging by full-waveform inversion (FWI) often requires to account for attenuation. Attenuation can be implemented in frequency-domain FWI with complexvalued velocities. FWI is however traditionally performed in the real domain to update separately real-valued phase velocities and attenuation factor. One reason is that the...