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Velocity analysis using common-reflection-point gathers

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Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3215272
... couldn t describe the mis-tie time information caused by azimuthal anisotropy. Thus, the anisotropic model building must use the full-azimuth reflection angle gathers. (a) (b) Figure 2: Comparison of the full-azimuth reflection angle gathers (a) and the traditional offset domain common reflection point...
Proceedings Papers

Paper presented at the 2005 SEG Annual Meeting, November 6–11, 2005
Paper Number: SEG-2005-2261
... of ZTD gathers. A common-receiver style ZTD gathers calculated using reflection ray tracing and the scattering ray tracing are given in Figure 6 and Figure 7 respectively. In addition, since the ZTD data set is corresponding to a portion of reflector rather than a single imaging point, we may take...
Proceedings Papers

Paper presented at the 2005 SEG Annual Meeting, November 6–11, 2005
Paper Number: SEG-2005-2542
... common reflection-point based tomographic seismic migration velocity analysis Weihong Fei, and George A. McMechan, the University of Texas at Dallas Summary 3-D prestack depth migration and residual picking in common image gathers (CIGs) are the most time- consuming part in 3-D migration velocity...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427456
... built by using ray-based reflection tomography. Unlike conventional beam migration algorithms, CRAM enables to extract specular energy via bottom-up ray tracing from each image point, and directly calculate angle domain common image gather (ADCIG). The resulted stacked section of CRAM showed higher SNR...
Proceedings Papers

Paper presented at the 2010 SEG Annual Meeting, October 17–22, 2010
Paper Number: SEG-2010-3375
... velocity reflection velocity model upstream oil & gas automatic cr stack apex cmp gather csp gather levantine basin reservoir characterization migration velocity An automatic time imaging using Common Scatter Point gathers Sergius Dell , Dirk Gajewski, and Claudia Vanelle, University...
Proceedings Papers

Paper presented at the 2001 SEG Annual Meeting, September 9–14, 2001
Paper Number: SEG-2001-0885
... in the reflection angle domain. Such angle-domain common image gathers can be obtained from either wave equation- based or Kirchhoff integral-based prestack depth migration methods. RMS residual velocity associated with each subsurface image point is determined from semblance scan of common image gathers followed...
Proceedings Papers

Paper presented at the Offshore Technology Conference Asia, March 22–25, 2016
Paper Number: OTC-26412-MS
... the divide between turnkey on-time turnaround depth imaging processing and respect of the geology. reflection point upstream oil & gas cig time gather imaging process velocity model salt dome migration reservoir characterization time domain geophysicist algorithm synthetic seismogram...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13712816
...-out analysis precision beam migration annual meeting velocity field vertical velocity function lad gather information upstream oil & gas velocity analysis velocity model angle division imaging angle resolution Gray , S. H. , 2005 , Gaussian beam migration of common-shot...
Proceedings Papers

Paper presented at the 2012 SEG Annual Meeting, November 4–9, 2012
Paper Number: SEG-2012-0402
... are correct, the RMO = 0 and the angle gathers are flat. zo is the reflection point in depth of the RMO. Wave path construction from P-wave polarization MVA based on RMO and it does not use matching the er- ror of traveltime on the whole ray path to do the inversion. RMO MVA is based on the common image point...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13778639
... and minimizes the deviation in the Common Image Gathers (CIG) from a flat event. In our implementation, we select special image points based on dip and event coherency called back- projection points, from which the tomography traces rays back to the surface in order to distribute the velocity residual values...
Proceedings Papers

Paper presented at the 2003 SEG Annual Meeting, October 26–31, 2003
Paper Number: SEG-2003-2164
... of the reservoir geometry can be obtained. The Common Focus Point (CFP) tomographic inversion uses one-way focusing operators in order to obtain a global velocity model (Berkhout, 1997a,b; Cox and Verschuur, 2001, 2003). All focusing operators (corresponding to the reflection points related to all reflectors...
Proceedings Papers

Paper presented at the 2003 SEG Annual Meeting, October 26–31, 2003
Paper Number: SEG-2003-2096
...) showed the application of the intercept time ray parameter p) velocity analysis to common source, receiver and midpoint gathers. In general, the proposed velocity analysis method can be applied to offset versus travel time data. The common midpoint gathers are related to one reflection point...
Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-2914
... versa. The practical uses of the method are for velocity analysis or AVO studies using existing commercial toolkits. Introduction The need for an accurate gather conversion method from common-offset-gathers (COG) to common-image- gathers (CAG), and vice versa, stems from the manifold...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17723539
... analysis for common scatter point gather for equivalent offset migration technique Tomoaki Tanaka*, Hitoshi Mikada, Junichi Takekawa, Kyoto University Summary We noticed that an equivalent offset migration (EOM) technique could be applied to horizontal components of acquired reflection seismic data...
Proceedings Papers

Paper presented at the 1997 SEG Annual Meeting, November 2–7, 1997
Paper Number: SEG-1997-1822
... they are not correct. It will be argued that velocity analysis in the CFP domain brings improvement to these two crucial elements. The essence of the MVA tomography is to use the postmigrated domain, a common image gather (CIG) or common reflection point (CRP) gather, to analyse the consistency (i.e., the alignment...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-2210
... imaging algorithms. The quantitative analysis of the amplitude, re- lies on common-image gathers being flat (or equivalently, at the same depth). But the waves with different incident angles will have differ- ent apparent velocities, resulting in different depths for the same image point at different...
Proceedings Papers

Paper presented at the 2008 SEG Annual Meeting, November 9–14, 2008
Paper Number: SEG-2008-3003
..., the relations to form the common scattering angle gathers are derived by using the connection between the local slowness vectors and the incidence and dip angles (Sava and Fomel, 2005, 2006). The geometry of the local slowness vectors are at the central point of the directional analysis in wave-equation imaging...
Proceedings Papers

Paper presented at the 1999 SEG Annual Meeting, October 31–November 5, 1999
Paper Number: SEG-1999-0824
... to multipathing and why angle domain common image gathers will not. Then we will demonstrate the construction of angle-domain common image gathers from wave equation downward continued data for use in velocity analysis and amplitude-versus-reflection angle analysis. KINEMATICS OF MULTIARRIVALS IN THE SHOT...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13957039
... ABSTRACT High resolution true-amplitude RTM Angle-Domain Common Image Gathers (ADCIGs), indexed by subsurface reflection and azimuth angles, can be used for: In practice, the coarsely-sampled or irregularly-sampled shot and receiver locations on the surface leads to severe under-sampling...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-1149
...) proposed the concept of CIP (common image point). Instead of computing CIGs at every image point, or even in vertical columns, they are computed only at selected positions where, it is thought, they will yield useful information for velocity analysis. Calculating angle gathers from CIGs with only time lags...

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