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Keywords: velocity analysis
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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-2021-3579484
... continuation level velocity field geophysics minimizer final model continuation artificial intelligence continuation approach velocity surface exploration geophysicist 10 velocity analysis fomel A continuation approach for avoiding local minima in seismic velocity picking Luke Decker , and Sergey...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427291
... and interpretation methods based on isotropy are no longer suitable for wide-azimuth seismic data with anisotropy. In this paper, an automatic residual anisotropic velocity analysis technique is used to process wide-azimuth seismic data. Considering the effect of anisotropy on the velocity, which could be estimated...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3428259
... The presence of internal multiple reflections reduces the accuracy and quality of the results obtained in many stages of seismic processing, e.g., velocity analysis, stacking and time/depth migration. A novel scheme called Marchenko multiple elimination (MME) has recently shown impressive...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3419762
... transform seg international exposition iterative inversion equation velocity transform algorithm operator reservoir characterization upstream oil & gas reflection hessian cmp gather exploration geophysicist 10 velocity analysis primary reflection Separating primaries and multiples using...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3214849
... ABSTRACT We show how vertical downhole distributed acoustic sensing arrays can be used for P- and S- velocity analysis along the array. Using such velocity models, the array can be used in an effective moveout-based earthquake detection approach. We demonstrate both applications on 20 days...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3211300
... ABSTRACT Common-Image Gathers (CIGs) can be used for migration velocity analysis to update the velocity model and extracting the information of amplitude variation with offset or angle analysis. In addition, the high-quality stacking profile obtained by stacking the CIGs can be used...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3214472
... be further interpreted to describe fractured reservoirs or regional stress regimes. Residual velocity error on the other hand can be used to perform velocity analysis or quantify depth mispositioning. In this paper, we present a method that is robust to noise and can simultaneously extract the moveout...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3215171
... processing techniques and successful workflow. Presentation Date: Monday, September 16, 2019 Session Start Time: 1:50 PM Presentation Start Time: 4:20 PM Location: 214D Presentation Type: Oral correction velocity analysis streamer processing technique acquisition system japan seg...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3214990
... ABSTRACT We compare two iterative approaches for depth-migration velocity analysis by image-wave continuation in CIGs. One implementation aims at updating the whole model in each iteration, whereas the other updates it one layer at a time, from top to bottom. Previous investigations found...
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-2019-3215633
... upstream oil & gas only yolo model velocity analysis artificial intelligence yolo model automatic velocity neural network geophysics seismic data manual picking deep learning picking yolo-lstm model seg international exposition energy heap annual international meeting machine learning...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3215883
... ABSTRACT Seismic anisotropy is present in different geological settings at various scales. This significantly affects the standard hyperbolic reflection moveout approximation that is based on the assumption that layers are isotropic. Conventional traveltime picking and velocity analysis...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3215809
... reservoir characterization automatic velocity centroid algorithm annual meeting k-mean algorithm velocity analysis Ester , M. , H.-P. , Kriegel , J. , Sander , and X. , Xu , 1996 , A density-based algorithm for discovering clusters in large spatial databases...
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-2019-3215424
... . Burnett , W. , S. , Fomel , and R. , Bansal , 2011 , Diffraction velocity analysis by path-integral seismic imaging : 81st Annual International Meeting, SEG , Expanded Abstracts , 3898 – 3902 , doi : 10.1190/1.3628019 . Decker , L. , and S. , Fomel , 2014...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3215961
... ABSTRACT Full subsurface extended image volumes (EIVs) contain abundant information such as subsurface image gathers used in imaging, interpretation of rock properties or velocity analysis, but are expensive in term of computational cost and storage requirement due to their large size. Yet...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2994696
... reservoir characterization seg international exposition structure regularized inversion single sensor seismic data joint inversion workflow structure-regularized inversion velocity analysis inversion machine learning annual meeting surface wave velocity model artificial intelligence...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2998560
... out on a 2D 4C seismic data in the region. In this paper, we use a similar process on a different 2D 4C seismic data but with a complete well log which includes P and S velocity log information to show the effect of log guided velocity analysis on shear wave imaging using the pressure component. Shear...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2997208
..., October 17, 2018 Start Time: 9:20:00 AM Location: Poster Station 1 Presentation Type: Poster recurrent neural network upstream oil & gas artificial intelligence machine learning neural network annual meeting hyperbola velocity analysis recurrent network seg international exposition...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2997330
... in regional 2D seismic marine programs describing how we incorporate interpretation and non-seismic data early on in the workflow to constrain the seismic velocity models and aid further automatic velocity analysis. Examples shown are from large scale 2D projects in the deep waters offshore Brazil, Santos...

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