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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

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.
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https://hal.inria.fr/hal-01239896
Contributor : Equipe Roma <>
Submitted on : Tuesday, December 8, 2015 - 1:46:10 PM
Last modification on : Tuesday, September 8, 2020 - 10:48:04 AM

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Patrick R. Amestoy, Romain Brossier, Alfredo Buttari, Jean-Yves l'Excellent, Théo Mary, et al.. 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. SEG Annual meeting, Oct 2015, New Orleans, United States. pp.1303-1308, ⟨10.1190/segam2015-5713962.1⟩. ⟨hal-01239896⟩

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