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Keywords: inversion
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Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216479
... optimization algorithm. Inversion results show that low-frequency ambient-wavefield DAS data can constrain the Vs model to 750 m depth, which helps validate the potential of DAS technology as a tool for large-scale surface-wave investigation. Presentation Date: Monday, September 16, 2019 Session Start Time...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216428
... ABSTRACT As full-waveform inversion (FWI) is a nonunique and typically ill-posed inversion problem, simultaneous-source noisy data, which suffers from crosstalk noise caused by shots overlap and environmental noise, indeed requires a proper regularization to avoid cycle skipping and accelerate...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216467
... amplitude configuration inversion noise annual meeting diving wave acquisition random noise synthetic receiver gather separation source vessel shot line blended acquisition upstream oil & gas dither time reservoir characterization seg international exposition background...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216528
... ABSTRACT Recently the Reflection Full waveform Inversion method has been proposed as an alternative to classical ray-based velocity model building methods. This method considers a scale separation between the reflectivity and the velocity models. In the original RFWI approach, the reflectivity...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216594
... , R711 – R723 , 10.1190/geo2018-0199.1 . Hampson , D. P. , B. H. Russell , and B. Bankhead , 2005 , Simultaneous inversion of pre-stack seismic data : 75th Annual International Meeting, SEG , Expanded Abstracts , 1633 – 1636 , 10.1190/1.2148008 . Pan , X...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216617
... accurate linearized inversion scheme, denoted as least-squares Q Gaussian beam migration (LSQGBM), to iteratively solve for optimal images in viscoacoustic media. With this method, we can not only compensate for the amplitude loss and phase shift caused by attenuation loss during migration, but also...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216548
... Fjeldstad , T. , and D. Grana , 2018 , Joint probabilistic petrophysics-seismic inversion based on Gaussian mixture and Markov chain prior models : Geophysics , 83 , no . 1 , R31 – R42 , doi: 10.1190/geo2017-0239.1 . Grana , D. , T. Fjeldstad , and...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216517
... ABSTRACT Full waveform inversion (FWI) is a challenging data-fitting procedure based on full wave-field modeling to extract quantitative information from seismograms, and it has been widely knows as the most prospective quantitative seismic imaging technology. However, as an ill-posed and...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216501
... Chavent, G., 2017, Data space reflectivity and the migration based travel time approach to FWI: 79th Annual International Conference and Exhibition, EAGE, Extended Abstracts, doi: 10.3997/2214-4609.201701710 . ClØment, F., G. Chavent, and S. Gomez, 2001, Migration-based traveltime inversion...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216566
...A comparison of geophysical inversion and machine learning in inverse problems Yuji Kim1, Nori Nakata2 1University of Oklahoma, OK. 2Massachusetts Institute of Technology, MA. Summary Geophysical inversion and machine learning both provide solutions of inverse problems in which we estimate model...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216596
... , F. J. Herrmann , and M. Warner , 2016 , Constrained waveform inversion for automatic salt flooding : The Leading Edge , 35 , 235 – 239 , doi : 10.1190/tle35030235.1 . Gramstad , O. , and M. Nickel , 2018 , Automated interpretation of top and base salt...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216560
... ABSTRACT We present an algorithm to address the solution to large-scale full waveform inversion (FWI) in the framework of Bayesian inference. This is a sampling method guided by the local gradient information of the L2 norm misfit function. We employ the local gradient and the diagonal of the...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216531
... ABSTRACT We studied the feasibility of deblending of ocean bottom node (OBN) data with the purpose of using low frequency long offset signals for full waveform inversion (FWI) velocity-model building. We used unblended field records to simulate heavily blended data up to 8 Hz with a maximum...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216607
... quantify various reservoir parameters, including elastic, mineralogical, lithological, geochemical, geomechanical, and anisotropic properties over a 2D line or 3D volume. This study utilizes multiclient PSTM gathers acquired in Martin County, Texas for inversion. A new workflow, based on rock physics...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216552
... difference. The real data processing in Block SNL from Sichuan Basin shows that the proposed approach realizes a pretty registration between PP-wave and PS-wave image volumes, and effectively improves the precision of joint multi-wave inversion. Therefore, the feasibility of multi-wave non-rigid matching is...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216768
... from checkshot and semblance scanning. Vertical vibrator direct P and converted mode PS events are used to estimate P and S slowness s respectively. Model Validation and Travel Time Inversion for Anisotropy Estimation Ray tracing through isotropic velocity model is used to determine model misfit, by...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216809
... Madiba , G. B. , and G. A. McMechan , 2003 , Processing, inversion, and interpretation of a 2D seismic data set from the North Viking Graben, North Sea : Geophysics , 68 , 837 – 848 , doi : 10.1190/1.1581036 . Morhac , M. , 2006 , Deconvolution methods...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216777
... ABSTRACT In 2018, BP acquired an ocean-bottom-node (OBN) dataset at Mad Dog field in the Gulf of Mexico. We used these data to rebuild the salt and sediment velocity model, employing a recently developed full-waveform inversion (FWI) algorithm. This resulted in a step-change improvement in...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216613
... University. 10.1190/segam2019-3216613.1 Page 1088 © 2019 SEG SEG International Exposition and 89th Annual Meeting REFERENCES Commer, M., and G. A. Newman, 2008, New advances in three-dimensional controlled-source electromagnetic inversion: Geophysical Journal International, 172, 513 535, doi: httpsdoi.org...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216758
... ABSTRACT Full-waveform inversion is an iterative data-fitting procedure used to resolve complex subsurface elastic property models. It has the potential to become a tool for quantitative interpretation at stratigraphic and reservoir scales. To illustrate, we make use of a geologically modeled...

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