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Keywords: implementation
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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-2021-3564832
... to recover elastic parameters in regions of interest. In this study, we compare full-waveform inversion and amplitude-phase versus offset inversion to recover elastic parameters for a reflector of interest using a local elastic solver. upstream oil & gas local solver local domain implementation...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3583520
... geophysicist 10 solver preconditioner machine learning equation direct solver upstream oil & gas boundary condition implementation operto métivier Solving frequency-domain elastic wave equations via parallel controllability methods Jet Hoe Tang1, Romain Brossier1 and Ludovic Me´tivier1,2 1Univ...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3584210
... important to understand how way. The methodology used is based on work published by variations of composite constituents affect said properties. Voorn et al. (2013). We also implemented our variant of the The behavior of composites varies under the influence of described method to extend Voorn et al...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594268
... improve post-stack dataset s SNR and achieved decent implementation for 3D CWT. Then we propose a pre-stack noise attenuation method, which uses a hard thresholding © 2021 Society of Exploration Geophysicists 10.1190/segam2021-3594268.1 First International Meeting for Applied Geoscience & Energy Page 2834...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594362
... implementation fwi artificial intelligence applied geoscience azmanager exploration geophysicist 10 artifact github operator Chevron Optimization Framework for Imaging and Inversion (COFII) an open source and cloud friendly Julia language framework for seismic modeling and inversion. John Washbourne...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594688
... a multi-GPU implementation of a well-established iterative Marchenko algorithm based on (the) Neumann series. The time convolution and space integration performed on each iteration, also referred to as synthesis, are here represented as a segmented dot product, which can be accelerated on modern GPUs...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594693
... will Current implementations of FWI are still acoustic with VTI perform a few extra positioning pinging runs. This will and TTI anisotropy parameters. Another benefit of the 4C accurately position each node down to 5m, which is OBS node data would be to possibly extend such accurate enough to be able...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3595008
.... to ensure convergence. To implement the scheme in Eq. (3), In the restarting approach implemented in SLEPc (Eiermann and Ernst, 2006; Steward et al., 2018), only the last basis vec- the pseudodifferential operator has to be computed. This tor vm+1 is kept (in order to continue the Arnoldi recurrence...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3580806
..., with NMO stretch to the CMP gathers with corrected stretch. 1975) and inverse NMO stack (Claerbout, 1992) to perform The trained network can then be tested on gathers that are not NMO correction without stretch. Ma et al. (2015) implemented a part of training. We discuss two different ways of creating...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3425103
... Presentation Time: 8:30 AM Location: 361F Presentation Type: Oral artificial intelligence receiver time-domain fwi misfit function optimization problem geophysics seg international exposition receiver position reservoir characterization waveform inversion implementation inversion upstream...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427630
... interface equation upstream oil & gas seafloor elastic imaging topography curvilinear coordinate boundary condition implementation grid harmonic averaging Elastic imaging in curvilinear coordinates with simpli ed boundary conditions at the sea oor Cosmin Macesanu, TGS SUMMARY the spectral...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3426726
... approximation wavefield velocity model seg international exposition upstream oil & gas internal multiple iteration implementation crosstalk reservoir characterization wave equation migration exploration geophysicist 10 reverse time migration reflectivity imaging expanded abstract lsrtm...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3426296
... In order to exploit Hessian information in Full Waveform Inversion (FWI), matrix-free truncated-Newton method can be used. In such a method, the Hessian-vector product can be estimated thanks to four wavefield simulations. Different from frequency-domain implementation, it is not feasible...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3423098
..., we present various fluid-solid coupled modeling examples including isotropic elastic, anisotropic elastic (VTI and TTI) and anelastic media on the Cartesian-based hexahedral mesh. They are all implemented with the displacement potential formulation which achieves the best trade-off compared...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3209086
...:50 PM Presentation Start Time: 2:40 PM Location: 304A Presentation Type: Oral wave equation gsrm elastic anisotropic media stability condition vector reservoir characterization wavefront implementation edge effect real component media anisotropic media pml wave solution...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3214439
..., in the third step, we apply the nonlinear inversion to improve the accuracy of the coefficients. After calculating these coefficients, we describe the scheme to implement the four-way splitting FFD propagator in the TTI media and then use this propagator to produce the WEM image. The numerical and real-data...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3207493
... of the method can be used for linear diffractors imaging. It consists of a coherent summation of seismic energy along edge-diffraction traveltimes. In the time reversal approach, in principle, no imaging condition is required. Numerical implementation of the method uses back propagation of the time-reversed...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3215304
... Start Time: 8:30 AM Presentation Time: 9:20 AM Location: 221D Presentation Type: Oral hessian matrix fwi neural network mldescent method implementation optimization algorithm optimization problem information artificial intelligence machine learning seg international exposition...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3215203
... surveys, and implementation of risk reduction strategies. Presentation Date: Monday, September 16, 2019 Session Start Time: 1:50 PM Presentation Start Time: 1:50 PM Location: 303B Presentation Type: Oral earthquake harris mega-thrust earthquake risk management risk and uncertainty...
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...

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