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Keywords: regularization term
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Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3583950
... Geophysical inversion problems have inherent ambiguity that requires regularization terms in the objective function to add prior information and constraints to reduce non-uniqueness. The types of regularization term introduced are different for different applications, but some regularization...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427320
.... While they are able to provide accurate reconstructions of seismic data without the need for any training data, they tend to suffer when large gaps are present in the missing data. We observe significant improvements in the reconstructed data when a POCS regularization term is introduced to the DIP. We...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3428359
... p (0 ≤ p ≤ 2) norms can be implemented on different components of the regularization terms. We randomly sample the p-norm values multiple times, and generate a large number of models. Uncertainty can then be quantitatively analyzed by measuring the degree of variability in the recovered physical...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3426049
... and efficient Q-RTM method, in which a regularization term is introduced into the decoupled constant-Q fractional Laplacians viscoacoustic wave equation, to suppress the high-frequency instabilities during the attenuation compensation. Meanwhile, a Q compensated excitation amplitude image condition is conducted...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3420227
... inversions in a deterministic framework. We performed inversions using a mixed L p -norm formulation where various combinations of L p (0 ≤ p ≤ 2) norms can be implemented on different components of the regularization term. Specifically, we randomly sampled the p-norm values multiple times, and generated...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3199662
... with respect to the time shifted signal. We propose a misfit function by stereo optimal transport of the matching filter (SOTMF), which takes the space coherency of the resulting matching filter into consideration. Compared to OTMF, SOTMF has an extra regularization term, which controls the variations...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3215960
... at critical angle. In addition, on a multi-layer model we demonstrate how a regularization term can improve the coherency of the amplitude across different reflection angles when coarse-shot sampling causes uneven illumination. Presentation Date: Tuesday, September 17, 2019 Session Start Time: 8:30 AM...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216210
... regularization term objective function misfit upstream oil & gas tikhonov regularization data misfit conventional tikhonov regularization first-arrival traveltime tomography velocity model inversion result regularization regularization alone Ajo-Franklin , J. B. , B. J. Minsley...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2998643
... annual meeting velocity change regularization regularization term reservoir characterization seismic data seg international exposition optimization problem regularization strength relation upstream oil & gas Biondi , B. , G. Mavko , T. Mukerji , J. Rickett...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2997453
... iteration representation fwi similarity objective function regularization term regularization inversion algorithm nonlocal similarity stanford university dictionary learning artificial intelligence inversion result full waveform inversion Aharon , M. , M. Elad...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17748783
... ABSTRACT We analyze the source of slow convergence of tomographic full waveform inversion and find that it is caused by the unbalanced effects of amplitudes and phase both in the formulation of the regularization term and the enhancing operator. This imbalance results in a strong dependence...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17790540
...-based rock-physics con- straints adapted from the classic methods. We show that such constraints can be incorporated into FWI by adding appropri- ately designed regularization terms to the objective function. The advantages of the proposed algorithm are demonstrated on both isotropic and VTI...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17659394
... into ‘white data’ through two linear transformations. The improved method allows using L1 norm as regularization term including the correlation information. Therefore, we use the L1 norm as the regularization term and add the wave impedance constraint term in the objective function to increase the stability...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17589500
... reflection travel time inversion (DWERTI) method and modifies the conventional Dynamic Imaging Warping (DIW) method with a regularization term. The travel time difference is measured within the observed or synthetic data rather than between them. The misfit function is defined and the corresponding gradient...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13872436
.... It comprises two additional regularization terms to the FWI objective function. The first term evaluates the norm of total variation (TV) of the model, while the second term steers the solution based on local prior information of the model spatial variability. Both regularization terms can be made spatially...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13950002
... principles. We add an 0-norm regularization term to the objective function of the least-squares Kirchhoff migration. The proposed algorithm has been applied to a complex synthetic dataset. Compared with 1-norm and 2-norm regularizaiton, results show that the super-resolution method with the 0 -norm...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13773270
... thing we have to keep in mind is that, under such a circumstance, the stronger regularization terms have to be considered if we want to obtain a reliable inverted model. In this work, we adopt an joint regularization techniques. Not only a conventional Laplacian regularization is applied, but also...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13772708
... additional regularization terms have to be applied to ensure a stable solution of the inverse problem. The sensitivity analysis and the synthetic data example demonstrated the correctness of the presented frechet derivatives and the robustness the additional regularization terms. It provides a solid...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5932246
... conduct high frequency filtering in wavenumber domain before or during wavefield extrapolate in RTM to ensure stability. In this paper, we use viscoacoustic wave equation derived by Bai et al. (2013) to do Q-RTM and stabilize extrapolate by adding a regularization term. Compared with direct filtering...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5851040
... regularization term artificial intelligence blue solid line aramco research center reservoir event resolution reservoir characterization saudi arabia government inversion result amplitude change A model-based warping method for 4D event characterization Hyoungsu Baek*, Timothy H. Keho Aramco Research...

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