The north Ligurian margin is a complex geological area in many ways. It has witnessed several phases of highly contrasting deformation styles, at both crustal scale and that of shallower cover tectonics, simultaneously or in quick succession, and with significant spatial variability. This complex interplay is mirrored in the resulting intricate...
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2020 (v1)PublicationUploaded on: April 14, 2023
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1999 (v1)Journal article
International audience
Uploaded on: February 28, 2023 -
October 11, 2020 (v1)Conference paper
Ultra-long offset seabed acquisitions implemented with sparse array of ocean bottom nodes (OBN) are emerging as the goto strategy for velocity model building. These stationaryrecording geometries provide the flexibility to record a plethora of wave arrivals and in particular diving waves that undershoot the deepest targeted structures. These...
Uploaded on: December 4, 2022 -
February 28, 2022 (v1)Journal article
Efficient frequency-domain Full Waveform Inversion (FWI) of long-offset node data can be performed with a few frequencies. The seismic response of these frequencies can be computed with compact finite-difference stencils on regular Cartesian grid with direct or hybrid direct/iterative methods. Compactness, which is necessary to mitigate the...
Uploaded on: December 3, 2022 -
December 12, 2022 (v1)Publication
International audience
Uploaded on: April 14, 2023 -
September 2014 (v1)Journal article
The computational burden of frequency-domain full-waveform inversion (FWI) of wide-aperture fixed-spread data is conventionally reduced by limiting the inversion to a few discrete frequencies. In this framework, frequency-domain seismic modeling is performed efficiently for multiple sources by solving the linear system resulting from the...
Uploaded on: December 4, 2022 -
June 16, 2014 (v1)Conference paper
Frequency-domain full waveform inversion (FWI) of fixed-spread data can be limited to a few discrete frequencies thanks to the redundant control of frequency and scattering angle on the wavenumber coverage. In this framework, 3D finite-difference frequency-domain seismic modeling can be efficiently performed for multiple sources in the...
Uploaded on: December 4, 2022 -
September 13, 2015 (v1)Conference paper
Full Waveform Inversion is a high-resolution imaging method that has raised considerable interest in the oil industry since a decade. It has been mainly used as a P-wave velocity modeling building tool, while extension to multi-parameter elastic anisotropic reconstruction is now an active field of research. In this context, designing...
Uploaded on: December 4, 2022 -
June 16, 2014 (v1)Conference paper
Full Waveform Inversion is an appealing technique to derive Earth subsurface models. With the development of modern HPC architectures, FWI implementations should benefit from the available computing power. In this study, after a review of time and frequency-domain FWI formulations based on time-domain solver for the forward problem, we discuss...
Uploaded on: December 4, 2022 -
April 19, 2021 (v1)Conference paper
Offshore 2D-Multichannel seismic (MCS)-reflection profiles were acquired in northern Ecuador during the HIPER survey (March/April 2020, R/V L'Atalante) together with one 2D-OBS-seismicrefraction profile (presented in a joint abstract by A. Skrubej). This project (presented in a joint abstract by A. Galve) aims at deciphering the role of lower...
Uploaded on: December 4, 2022 -
July 2, 2015 (v1)Journal article
Computationally efficient 3-D frequency-domain full waveform inversion (FWI) is applied to ocean-bottom cable data from the Valhall oil field in the visco-acoustic vertical transverse isotropic (VTI) approximation. Frequency-domain seismic modelling is performed with a parallel sparse direct solver on a limited number of computer nodes. A...
Uploaded on: December 4, 2022 -
2023 (v1)Journal article
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...
Uploaded on: July 9, 2023 -
June 1, 2015 (v1)Conference paper
We present a 3D time-domain target-oriented elastic full-waveform inversion method well-adapted to the reconstruction of lithospheric images from passive teleseismic data. In teleseismic configurations, sources no longer correspond to point sources embedded in the lithospheric target but rather correspond to a nearly plane wavefronts generated...
Uploaded on: December 4, 2022 -
May 2024 (v1)Conference paper
The solution of sparse systems of linear equations is a key computational kernel in scientific computing. It often represents the most time, memory and energy consuming part of the whole numerical simulation process. In this talk, we focus on sparse direct solvers, and more particularly on MUMPS sparse multifrontal solver...
Uploaded on: July 11, 2024 -
June 1, 2015 (v1)Conference paper
We present an application of 3D VTI visco-acoustic frequency-domain full waveform inversion (FWI) based on sparse direct solver on wide-azimuth OBC data from the Valhall oil field. Mono-parameter inversion for the vertical wavespeed is applied to the hydrophone component in the 3.5-10Hz passband. Compared to reflection traveltime tomography, we...
Uploaded on: December 4, 2022 -
March 2020 (v1)Journal article
The north Ligurian margin is a complex geological area in many ways. It has witnessedseveral phases of highly contrasting deformation styles, at both crustal scale and that of shallower covertectonics, simultaneously or in quick succession, and with significant spatial variability. This complexinterplay is mirrored in the resulting intricate...
Uploaded on: December 4, 2022