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Keywords: migration velocity analysis
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Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3425795
... Wave equation migration velocity analysis (WEMVA) builds a kinematically accurate macro velocity model containing the large-scale structures of the model for seismic imaging or full waveform inversion (FWI). Differential semblance optimization (DSO) formulates the misfit function...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3201707
... the migration is done trace by trace (or a few traces) between each source and receiver pair for each decomposition. Most importantly, we analyze the kinematic properties of SOGs and ADCIGs in the context of velocity error. They then can be used as a theoretical basis for performing migration velocity analysis...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3215490
... ABSTRACT Wave equation migration velocity analysis (WEMVA) is an image domain technique to recover the large-scale structure of the subsurface velocity model. The objective functions are posed directly to improve the quality of the image. However, due to the limited surface acquisition...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3215678
..., 2019 Session Start Time: 1:50 PM Presentation Start Time: 3:05 PM Location: Poster Station 12 Presentation Type: Poster optimal solution annual meeting global search strategy seg international exposition federal university global solution migration velocity analysis optimization...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3215493
... ABSTRACT Wave equation migration velocity analysis is an image domain method to estimate large-scale components of the velocity model. However, for classic migration and velocity analysis methods, due to the limited surface acquisition geometry and uneven illumination, the artifacts...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3215753
... ABSTRACT Wave Equation Migration Velocity Analysis (WEMVA) has been shown to have considerable potential in developing detailed velocity models for generating high quality images. However, previously proposed methods based on either sub-surface or surface offsets result in a considerable...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2998369
... ABSTRACT Migration velocity analysis (MVA) based on subsurface offset extended image provides a way to update the velocity model by measuring the focusing of the extended migrated image. The focusing property is introduced by a horizontal subsurface shift in the imaging condition, which...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17734132
...Diffraction-based migration velocity analysis using double-path summation Dmitrii Merzlikin*, Sergey Fomel, The University of Texas at Austin SUMMARY We apply double-path summation framework to perform auto- matic diffraction-based time-migration velocity analysis with- out picking. According...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17731992
...Full Azimuth Wave Equation Migration Velocity Analysis: A Real OBN Dataset Study Guojian Shan* and Yue Wang, Chevron Energy Technology Company SUMMARY We apply 3D full azimuth wave equation migration veloc- ity analysis (WEMVA) to a real ocean bottom node (OBN) dataset. We start from an initial...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17742694
... migration velocity analysis approximation tsvankin reservoir characterization annual meeting geophysics information alkhalifah artificial intelligence tomography seg seg international exposition upstream oil & gas gradient algorithm objective function inversion nmo media...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17750212
... to be a robust method to estimate the background velocity. As one of the wave equation migration velocity analysis (WEMVA) methods, it can overcome some of the problems of ray-based solutions. With a given P-wave velocity, we automatically estimate the background S-wave velocity via the DSO method in elastic...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17724488
... characterization image residual velocity model pitfall dso method geophysics upstream oil & gas information migration velocity analysis tomography annual international meeting Bakker , P. M. , S. Gerritsen , Q. Cao , D. van Daalen , and E. Duveneck , 2015...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13909106
... velocity model upstream oil & gas operator seg seg international exposition reservoir characterization migration velocity analysis initial velocity differential semblance optimization true velocity differential semblance optimization method gradient optimization problem angle...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13858670
... close to the true model to ensure convergence towards the global minima. The challenge in any application is to find such an initial model. Here, we use wave equation migration velocity analysis (WEMVA) to estimate the initial model for FWI. We show an example using 3D field seismic streamer data from...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13967472
... ABSTRACT Full-waveform tomography (FWT) is notorious for its strong dependence on the initial model. We present a workflow for the construction of initial velocity-models for FWT methods consisting of automatic time-migration velocity analysis by means of double multi-stack migration, followed...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13950424
... ABSTRACT Optimization-based Migration Velocity Analysis (MVA) updates long wavelength velocity information by minimizing an objective function that measures the violation of a semblance condition, applied to an image volume. Differential Semblance Optimization (DSO) forms a smooth objective...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5717655
... local minimals in the objective function of FWI, and prevents it from converging to the global minimal. Automatic migration velocity analysis such as differential semblance optimization (DSO) (Sava and Biondi, 2004a,b; Shen and Symes, 2008; Symes 2008) is another wave-equation based method...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5917235
... Summary We present a survey sinking based framework for residual migration velocity analysis. By using a migration algorithm in the temporal frequency domain, our migration algorithm is efficient and allows us to pick velocity perturbations directly. Picking velocity perturbation directly...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5925071
... model extension in a higher-dimensional space, and data redundancy for further discrimination. Differential semblance optimization is one such approach (Symes (1993); Shen (2004); Symes and Carazzone (1991)), and wave equation migration velocity analysis is another one (Sava and Biondi (2004a,b); Liu...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5922164
... Summary In migration velocity analysis (MVA), the residual moveout in the image gather is used to obtain velocity correction parameters. In this work we propose a numerical approach to describe the moveout in the image gather considering a dipping reflector instead of using approximations. We...

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