Bibtex de la publication

@InProceedings{ Am2015.12,
author = {Amestoy, Patrick and Brossier, Romain and Buttari, Alfredo and L'Excellent, Jean-Yves and Mary, Théo and Métivier, Ludovic and Miniussi, Alain and Operto, Stéphane and Ribodetti, Alessandra and Virieux, Jean and Weisbecker, Clément},
title = "{Efficient 3D frequency-domain full-waveform inversion of ocean-bottom cable data with sparse block low-rank direct solver: a real data case study from the North Sea (regular paper)}",
booktitle = "{Society of Exploration Geophysicists annual meeting (SEG), New Orleans (USA), 18/10/2015-23/10/2015}",
editor = {Robert Vincent, Schneider},
year = {2015},
publisher = {Society of Exploration Geophysicists},
address = {},
series = {251},
pages = {(on line)},
language = {anglais},
URL = { -},
abstract = {We present an application of 3D frequency-domain full waveform inversion (FWI) on ocean-bottom cable data from the North Sea. Frequency-domain seismic modeling is performed in the visco-acoustic VTI approximation with a sparse direct solver based on the multifrontal method. The computational cost of the multifrontal LU factorization is efficiently reduced with a block-low rank (BLR) approximation of the dense frontal matrices. A multiscale frequency-domain FWI is applied by successive inversions of 11 discrete frequencies in the 3.5Hz-10Hz frequency band. The velocity model built by FWI reveals short-scale features such as channels, scrapes left by drifting icebergs on the paleo-seafloor, fractures and deep reflectors below the reservoir level, although the presence of gas in the overburden. The quality of the FWI results is controlled by time-domain modeling and source wavelet estimation. Next step is the application of multi-parameter FWI with second-order optimization algorithms, which can be efficiently implemented with our frequency-domain modeling engine.}