OPERTO , S.

C029 Viscoacoustic Frequency-Domain Full-Waveform Inversion – Application to Numerical VSP Data A. Ribodetti* (Geosciences Azur) R.E. Plessix (Shell) S. Operto (Geosciences Azur - CNRS) & J.M. Virieux (Geosciences Azur) SUMMARY This work presents numerical tests to show that viscoacoustic frequency-domain full waveform tomographic inversion can...

P323 Finite-Difference Frequency-Domain Modeling of Acoustic Wave Propagation in 2D TTI Anisotropic Media M. Grini* (Géosciences Azur - CNRS) A. Ribodetti (Géosciences Azur - IRD) J. Virieux (Géosciences Azur - UNSA) & S. Operto (Geosciences Azur - CNRS) SUMMARY We present a 2D finite-difference frequency-domain method for modeling acoustic...

Full Waveform Inversion can be made immune to cycle skipping by matching the recorded data arbitrarily well from inaccurate subsurface models. To achieve this goal, the simulated wavefields can be computed in an extended search space as the solution of an overdetermined problem aiming at jointly satisfying the wave equation and fitting the data...

C027 3D Finite-Difference Frequency-Domain Modeling of Acoustic Wave Propagation Using a Massively Parallel Direct Solver H. Ben Hadj Ali* (Géosciences Azur - CNRS) S. Operto (Geosciences Azur - CNRS) J. Virieux (Géosciences Azur - UNSA) P. Amestoy (ENSEEIHT-IRIT) J.Y. L'Excellent (ENS Lyon-INRIA) & L. Giraud (ENSEEIHT-IRIT) SUMMARY We present...

P276 Multiparameter Full-Waveform Inversion for Velocity and Attenuation – Refining the Imaging of a Sedimentary Basin M. Malinowski* (Institute of Geophysics PAS) A. Ribodetti (Geosciences Azur CNRS UMR) & S. Operto (Geosciences Azur CNRS UMR) SUMMARY This study deals with the extension of the frequency-domain full-waveform inversion/modelling...

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...

3-D frequency-domain full waveform inversion (FWI) is applied on North Sea wide-azimuth ocean-bottom cable data at low frequencies (≤10 Hz) to jointly update vertical wave speed, density and quality factor Q in the viscoacoustic VTI approximation. We assess whether density and Q should be viewed as proxy to absorb artefacts resulting from...

International audience

We present a 3D frequency-domain finite-difference method for acoustic wave propagation modeling. This method is developed as a tool to perform 3D frequency-domain full-waveform inversion of wide-angle seismic data. For wide-angle data, frequency-domain full-waveform inversion can be applied only to few discrete frequencies to develop reliable...

Geophysical Prospecting, v. 56, n. 6, p. 805-825, 2008. http://dx.doi.org/10.1111/j.1365-2478.2007.00680.x

International audience

International audience

Seismic tomography seeks to reconstruct the subsurface parameters, mainly wavespeeds. In reflection/diffraction tomography, an additional parameter class is inherently introduced: the scattering positions. The underlying inverse problem is awkward due to the ill-famed velocity-position coupling. We review different optimization strategies in...

Full waveform inversion (FWI) is a waveform matching procedure which can potentially provide subsurface models with a wavelength-scale resolution. However, sophisticated regularization techniques are required to decrease the sensitivity of FWI to the initial model and noise and reduce the ill-posedness of the problem resulting from uneven...

International audience

International audience

Here we assess the potential of the visco-acoustic frequency domain full-waveform inversion (FWI) to reconstruct P-wave velocity (VP) and P-wave attenuation factor (Q) from surface onshore seismic data. First, we perform a sensitivity analysis of the FWI based upon a grid search analysis of the misfit function and several synthetic FWI examples...

International audience

International audience

We present a distributed-memory parallel algorithm for 2D visco-acoustic full-waveform inversion of wide-angle seismic data. Our code is written in fortran90 and use MPI for parallelism. The algorithm was applied to real wide-angle data set recorded by 100 OBSs with a 1-km spacing in the eastern-Nankai trough (Japan) to image the deep structure...

International audience