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Migration aperture

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Proceedings Papers

Paper presented at the 2001 SEG Annual Meeting, September 9–14, 2001
Paper Number: SEG-2001-0973
... Summary Reflection energy from a linear reflector comes from the integrant over an aperture often described by the Fresnel zone. Within the Fresnel zone, the diffraction energy constructively builds the reflection energy. To get true reflection amplitude, a migration aperture that is twice...
Proceedings Papers

Paper presented at the 2012 SEG Annual Meeting, November 4–9, 2012
Paper Number: SEG-2012-0504
... SUMMARY We propose a method providing an optimal aperture for common-scattering-angle Kirchhoff migration. Migrated data are split into constant-dip-angle partial images. Then, in every partial image, we estimate slopes of reflectors and filter out horizons whose slant is far from the constant...
Proceedings Papers

Paper presented at the 1989 SEG Annual Meeting, October 29–November 2, 1989
Paper Number: SEG-1989-1172
... ABSTRACT No preview is available for this paper. coarse grid kirchhoff migration migration aperture emergence angle trace location upstream oil & gas multigrid migration frequency reservoir characterization migration migrated section imaging event grid coarse-grid...
Proceedings Papers

Paper presented at the 2001 SEG Annual Meeting, September 9–14, 2001
Paper Number: SEG-2001-0977
... Summary True amplitude migration based on a weighted diffraction stack in a task of high computational costs. These can be significantly reduced if the involved summation is carried out only over traces which really contribute to the stack result, i.e., a limited aperture instead of the whole...
Proceedings Papers

Paper presented at the 2001 SEG Annual Meeting, September 9–14, 2001
Paper Number: SEG-2001-1867
...Recursive method to calculate the migration aperture function Li Jianyong*, Liu Hong, Li Youming Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, P. R. China Summary Recursive method is proposed to calculate the migration aperture function in lateral inhomogeneous medium...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-2339
... Summary The migration aperture is a parameter often difficult to set in Kirchhoff PSDM and on which the final quality of the migrated image depends strongly. It may take a lot of tests to determine the best possible aperture for a given dataset. We propose here a method to avoid migration...
Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-4144
... attenuation and interference by the free surface. However, due to the limited number of receivers that can be placed downhole relative to a surface survey, and the subsequent narrow acquisition aperture and low CDP fold, VSP migration images from 2D Walkaway VSP (WVSP) or 3D VSP data often contain strong...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-2354
...CRS-based minimum-aperture time migration a 2D land data case study Miriam Spinner and Ju¨rgen Mann*, University of Karlsruhe SUMMARY The Common-Reflection-Surface stack provides a set of kinematic wavefield attributes that characterize the reflection events in seismic prestack data. One of their...
Proceedings Papers

Paper presented at the 2003 SEG Annual Meeting, October 26–31, 2003
Paper Number: SEG-2003-1087
... Summary We present a controlled-aperture wave-equation migration method that not only can reduce migration artifacts due to limited recording apertures and determine image weights to balance the effects of limited-aperture illumination, but also can improve the migration accuracy by reducing...
Proceedings Papers

Paper presented at the 2006 SEG Annual Meeting, October 1–6, 2006
Paper Number: SEG-2006-2569
...3D CRS-based limited aperture Kirchhoff time migration Miriam Spinner, Geophysical Institute, University of Karlsruhe Summary The efficiency as well as the quality of Kirchhoff migration strongly depends on the choice of the migration aperture. Lim- iting the aperture to the size of the projected...
Proceedings Papers

Paper presented at the 2005 SEG Annual Meeting, November 6–11, 2005
Paper Number: SEG-2005-1890
... ABSTRACT Our workflow consists first in migrating the data with an aperture class Kirchhoff PSDM algorithm. We obtain a migrated image for each aperture class which we can weight before stacking them. We have developed an algorithm which automatically picks coherent events on the different...
Proceedings Papers

Paper presented at the 2004 SEG Annual Meeting, October 10–15, 2004
Paper Number: SEG-2004-0941
... ABSTRACT We propose a new implementation of wave-equation migration with controlled apertures determined by the wavepath migration approach. The new method, denoted as controlled-aperture wavepath-wave-equation migration, employs a two-step strategy to migrate common-shot seismic data. In the...
Proceedings Papers

Paper presented at the 2008 SEG Annual Meeting, November 9–14, 2008
Paper Number: SEG-2008-0983
... data azimuthal migration aperture low fold isotropic migration angle gather reservoir characterization variation complex reservoir Summary Travel time variations in the angle gathers from unmigrated super gathers; Sectored isotropic migration angle gathers; and Iterative...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3214690
... synthetic aperture (OSA) data for TSEM survey. We first represent the OSA data as the solution of Lippmann-Schwinger equation, and then demonstrate that the migration of OSA data is just the inner product of the backward-propagated and forward-propagated EM fields. The migration problem was solved...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5903684
... pswave kirchhoff time migration migrated image cubic convolution interpolation migration aperture upstream oil & gas interpolation s-wave velocity reservoir characterization kirchhoff migration migration impulse response key factor interpolation node geophysics linear...
Journal Articles
Journal of Petroleum Technology 72 (03): 74–75.
Paper Number: SPE-0320-0074-JPT
Published: 01 March 2020
... resolution and amplitude fidelity of the resulting seismic images, namely the acquisition con-figuration, absorption of the anelastic Earth, and the complexity of the subsurface velocity model. With regard to the first factor, seismic images can suffer from limited migration aperture and nonuniform...
Proceedings Papers

Paper presented at the 2012 SEG Annual Meeting, November 4–9, 2012
Paper Number: SEG-2012-0258
... dips. Under these circumstances, a static shift distorts the wavefield and degrades the velocity analysis and imaging. Therefore, topographic RTM is necessary. However, other considerations are also required, such as vertical grid size, migration apertures, and source wavelet peak frequency for...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3198043
... and fine modeling of dual-well micro-logging is adopted to compensate amplitude and phase correction. Surface consistent time-varying pulse deconvolution is used to widen the data band before migration. The equivalent Q field is obtained by Q value and F3 scanning, and the migration aperture in XY...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5916514
... subsalt imaging. The problems include imperfect migration velocity, slow convergence in subsalt area, and extra migration artifacts introduced in gradient computation. The adaptive solution involves strategies to enhance data consistency in time domain and control the migration aperture to precondition...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5860978
... clean and enhance the stacked migration image. For bandlimited migration algorithms we define an original prestack image domain that is analogous to the aperture partitioned migration domain of Kirchhoff-type migration techniques. Through an automatic procedure that is based on a coherence analysis we...

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