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Keywords: propagator
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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-2021-3583720
... results. Many authors have proposed to separate qP-waves from elastic waves for better imaging results. As an alternative approach, in this study, we develop a first-order wave propagator of pseudo-pure-qP-wave in 2D heterogeneous VTI media using a staggered-grid scheme. We have performed this algorithm...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3586537
... In this paper, we present a novel migration formulation using pulsed-beams. Our method is based on the phase-space pulsed beam summation method. In this formulation, we use pulsedbeams to expand the surface field and propagate it into the subsurface. A unique property of this method is obtained...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3426045
...-amplitude imaging. Benefiting from the Gaussian beam propagator, which is a one-way beam propagator, the proposed method has more flexibility than the method based on two-way wave equations, and it can be adapted to higher frequency imaging with less computational cost compared to two-way wave equation...
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-2019-3216856
... the imaging problem into the beam domain. In the beam domain, the representation is a priori localized in both the data and the beam propagators. The formulation consists two phases. First, is the pre-processing step in which we filter out the beams with negligible amplitude. Next, in the imaging step, given...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3198472
... ABSTRACT We develop a generalized stabilization scheme for seismic compensation by deriving the k-space Green’s function for the compensated constant- wave equation with decoupled fractional Laplacians (DFLs). Since the time propagator of this equation increases exponentially with travel time...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216409
... ABSTRACT Elastic wave propagation is highly complex when P- and S-waves scatter away and convert to each other at the discontinuities in the medium. Conventional elastic wave simulation methods often model particle displacement/velocity fields due to both P- and S-wave propagation...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-W03-01
... hybrid approaches to combine the strengths and mitigate the known weakness of different algorithms. One-way wave propagator is efficient for high frequency imaging and improving the vertical resolution, but lacks the power of imaging steeply dipping structures. On the other side, two-way wave propagator...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17748342
...Two-way wave depth migration using Fourier finite difference propagator Jiachun You1,2*, Rushan Wu2, Xuewei Liu1 1. School of Geophysics and Information Technology, China University of Geosciences, Beijing, China 2. Modeling and Imaging laboratory, Institute of Geophysics and Planetary Physics...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17642022
...Scalar Wavefield Time Domain Propagation in 3D TTI Media with Fourier Finite Differences Xiaolei Song , BP SUMMARY I propose a new 3D scalar TTI wave propagation method: TTI Fourier Finite Differences (FFD), a chain operator of FFTs and FDs. It can achieve pseudo-analytical accuracy with about 3...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13964128
... propagator sava upstream oil & gas wapenaar geophysics Amundsen , L. , 2001 , Elimination of free-surface related multiples without need of the source wavelet : Geophysics , 66 , 327 – 341 , 10.1190/1.1444912 . Behura , J. , K. Wapenaar , and R...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13850596
... ABSTRACT 3-D superwide-angle one-way propagator is based on the screen methods but has much higher accuracy in wide angle. It can overcome angle limitation in the traditional one-way approaches and in the meanwhile it possesses some properties of one-way methods, i.e., high computational...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5835086
.... We introduce a regularization operator to eliminate high frequency instability caused by the backward propagation. In the meantime we build a stable reverse time propagator to achieve the amplitude compensating reverse time migration for viscoacoustic isotropic medium and viscoacoustic VTI medium...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5864227
...-domain blurring function, arms ignored. Not to scale. migration raw eig wapenaar eig reflectivity slowness angle amplitude reflection operator reservoir characterization upstream oil & gas propagator interface fletcher image gather plane-wave reflection coefficient slant stack...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5915894
...One-way TTI propagation: Is it still relevant ? Madhav Vyas, Xin Wang & John Etgen BP America Inc., Houston, TX Summary We propose a case for the continued usefulness of one-way TTI propagators. This case is primarily based on the fact that in general, one-way codes are significantly faster than...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-0921
... Summary We derived the nonlinear sensitivity operator and the related inverse thin-slab propagator (ITSP) for nonlinear tomographic waveform inversion based on the theory of nonlinear partial derivative operator. The inverse propagator is based on a renormalization procedure to the forward...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-0934
...-way boundary element method and a corresponding hybrid acoustic thin-slab propagator for such strong-contrast media. The one-way BEM (boundary element method) is formulated to save huge matrix operations and storage in the full BEM; but accurate boundary condition is kept so that the method completely...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-0712
... Summary To overcome the weak scattering limitation of traditional one-way elastic propagator, we propose a hybrid elastic propagator for strong-contrast media, which combines the thin-slab propagator for weak perturbations and with the PO (physical optics) approximation at the irregular sharp...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-0410
... method geophysics multidimensional deconvolution burnstad separation seg houston 2013 wapenaar upstream oil & gas wavefield separation receiver array reservoir characterization interferometry bakulin condition number propagator depth level multiple depth Acoustic wavefield...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-1098
... Summary With the advantages of high speed of computation and low cost of computer resources, one-way propagators have been used widely in modeling and migration. On the other hand, regular one-way propagators have indeed difficulty in dealing with wide-angle problems. In this paper, we...

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