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Keywords: extrapolation
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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-2021-3594767
... Low-frequency extrapolation of reflection seismic data is a more challenging task in comparison to transmission data, especially when shallow strong reflectors are in presence. To overcome this issue and extract the information from the low energy seismic events contributed from deep reflectors...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3580596
... relationship linear relationship single-trace geometry repeatability multi-trace geometry repeatability extrapolation equation A solution to the demonstration of geometry repeatability Mao Hejiang, Xin Xiuyan, Quan Haiyan, He Yongqing, Xu Zhaohong, and Dong Fengshu*, BGP, CNPC Summary Theoretical...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3581463
... four-component data. In this method, we define a weighted boundary condition to back-extrapolate the TS and OBN/OBS data. Based on the acoustic-elastic coupled equations, we can realize the receiver-side tensorial extrapolation with the defined boundary condition, and improve the above problems caused...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3567608
... In viscoacoustic reverse-time migration (RTM), attenuation compensation can be implemented by reversing the sign of the dissipation term and keeping the dispersion term unchanged for backward wavefield extrapolation. Although the Q-compensated RTM scheme can effectively correct attenuation...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3579442
... The presence of low-frequency energy in seismic data can help mitigate cycle-skipping problems in full-waveform inversion. Unfortunately, the generation and recording of low-frequency signals in seismic exploration remains a non-trivial task. Extrapolation of missing low-frequency content...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3417492
...Low-frequency extrapolation using higher-frequency multi-channel prediction filters Stephen K Chiu*, In-Depth Geophysical Summary machine learning techniques led to a better understanding to the physics of the solution. We present a practical and effective method to extrapolate low frequencies...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3399306
...Machine-learning based data recovery and its benefit to seismic acquisition: deblending, data reconstruction and low-frequency extrapolation in a simultaneous fashion Shotaro Nakayama* and Gerrit Blacquière, Delft University of Technology Summary Various studies have discussed the importance of low...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3428344
... characterization operator length seg international exposition temporal accuracy novel fourier finite-difference scheme operation ffd scheme 1 fourier operator accuracy exploration geophysicist 10 extrapolation equation upstream oil & gas temporal operator ffd scheme 2 operator Two novel...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3424773
... & gas repeatability machine learning deep learning vertical velocity profile neural network kazei ovcharenko artificial intelligence extended abstract alkhalifah exploration geophysicist 10 misfit function plotnitskii geophysics extrapolation eage exhibition seg international...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427522
... are particularly challenging due to the elastic nature of the Earth contrasting with acoustic air at the typically rugged free surface, which makes the use of low frequencies even more vital to the inversion. We propose a supervised deep learning framework for bandwidth extrapolation of prestack elastic data...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3207486
... ABSTRACT We design post-propagation filters using deep learning for overcoming the numerical dispersion of finite-difference wave extrapolation. We train the network with a given velocity model using three to four time-slices for a particular source location using the conventional finite...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3214592
... layer (PML) absorbing boundary condition and a spatial variable density. We derive an analytical temporal extrapolation formula under the staggered-grid configuration. The analytical extrapolation formula ensures an absolutely stable simulation result without numerical dispersion in homogeneous media...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216331
... that the higher-order approach yields a much better extrapolation of traveltime and geometrical spreading into the paraxial region of a reference ray — for isotropic as well as anisotropic heterogeneous 3D models of an elastic medium. This is of value in mapping, modelling, and imaging, where kernel operations...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2991046
... zhang equation seg international exposition geophysics integral operator reservoir characterization approximation boundary condition upstream oil & gas inversion annual international meeting snapshot alkhalifah extrapolation finite-difference method anisotropic media partial-low-rank...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2991221
... ABSTRACT Dynamic ray tracing is an efficient and reliable method for computation of geometrical spreading along a given reference ray. The method yields first-order derivatives of perturbations in position/slowness and therefore enables first-order extrapolation of these quantities to points...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17747488
... ABSTRACT In this paper, we proposed a novel staggered-grid low-rank finite-difference (SGLFD) scheme to solve decoupled second-order elastic wave equation. The scheme successively employs backward and forward first-order mixed-domain symbols on a staggered grid to obtain the wave extrapolation...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17748342
...: Exhibit Hall C/D Presentation Type: POSTER migration method migration section one-way wave propagator propagator migration extrapolation reservoir characterization salt model upstream oil & gas sensor migration method dual sensor migration method dual sensor ffd migration method...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17775790
... ABSTRACT We present a methodology to invert seismic data for a localized area by combining source-side wavefield injection and receiver-side extrapolation method. Despite the high resolving power of seismic full waveform inversion (FWI), the computational cost for practical scale elastic FWI...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17723629
... extrapolation migration fwmod wavefield grid modeling seg seg international exposition reservoir characterization operator propagation berkhout cartesian grid seismic modeling refracted reflectivity verschuur orthogonal staggered grid Adamczyk , A. , M. Malinowski...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17725126
... the wavenumber gap in the extended image space, where full kinematic information in the data is preserved in spite of the inaccuracy of the background migration velocity model, and where the wavenumber range of the extended image is extrapolated using total-variation constrained deconvolution. This explicit...

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