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Aspects of 3-D prestack time migration — a summary

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Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17724422
... of residual prestack migration Figure 2: PSTM with reflector position(blue) Figure 3: Mapped PSDM with reflector position (red) Figure 4: Velocities for PSTM and PSDM Figure 5: Semblance for PSTM, mapped PSDM Figure 6: Positional bias for PSTM, mapped PSDM Figure 7: Velocity model with four horizons Figure 8...
Proceedings Papers

Paper presented at the 1995 SEG Annual Meeting, October 8–13, 1995
Paper Number: SEG-1995-1175
... in this article can be extended to 3-D data processing. METHOD Fig.1. shows the detailed flow chart of the approach of prestack depth migration proposed in this article. It is based on the Kirchhoff s migration theory; and consists of three main parts: (1) seismic data preprocessing, (2) velocity-depth model...
Proceedings Papers

Paper presented at the 2004 SEG Annual Meeting, October 10–15, 2004
Paper Number: SEG-2004-1017
... Angle Compensation in Kirchhoff Depth Migration Figures 3 and 4 show images from two 3-D Kirchhoff prestack depth migrations of a deep water salt body. The same velocity model was used for both migrations. The migration that produced the image in Figure 3 was run without illumination angle compensation...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216095
... , R. , 1996 , A prestack residual time migration operator : Geophysics , 61 , 605 – 607 , doi: 10.1190/1.1443987 . Whitcombe , D. , 1994 , Fast model building using demigration and single-step ray migration : Geophysics , 59 , 439 – 449 , doi: 10.1190/1.1443606...
Proceedings Papers

Paper presented at the 2000 SEG Annual Meeting, August 6–11, 2000
Paper Number: SEG-2000-0762
... imaging vertical cable seismic data reservoir characterization depth migration migration source wavefield upstream oil & gas prestack rtm prestack depth migration geophysics wavefield 3-D prestack reverse-time depth migration applied to vertical cable seismic data Yunqing Shen* and Paul...
Proceedings Papers

Paper presented at the 1999 SEG Annual Meeting, October 31–November 5, 1999
Paper Number: SEG-1999-1287
... upstream oil & gas reflection tomography migration prestack line gx technology corporation tomography 3-D reflection tomography in time-migrated space Pierre Hardy* and Jean-Paul Jeannot, GX Technology Corporation Summary In the field of seismic imaging, prestack techniques have proven...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-1865
... method The prestack waveform inversion method was applied to a 3-D seismic data set in the Gulf Coast of United States. The input data set consisted of a set of prestack time migrated gathers tied to well log synthetics , the well log suite for a vertical well, a seismic wavelet estimate and the prestack...
Proceedings Papers

Paper presented at the 2006 SEG Annual Meeting, October 1–6, 2006
Paper Number: SEG-2006-0500
..., we created an rms velocity field associated with reflector positions (Figure 3). Finally, we performed prestack time migration of the shot gathers to verify the fidelity rms velocity field (Figure 4). 501SEG/New Orleans 2006 Annual Meeting Figure 2. Three cross-sections of the rms velocity volume: X...
Proceedings Papers

Paper presented at the 2002 SEG Annual Meeting, October 6–11, 2002
Paper Number: SEG-2002-1508
... and vertical resolution than the post stack migration results. This is because although the velocity is known, there is a gap in the CDP coverage with this acquisition geometry. -4 -2 0 2 4 6 8 0 0.5 1 1.5 2 0 0.5 1 1.5 2 2.5 3 3.5 a b c d a b Fig. 3 a. recording geometry: target at the center of the array. b...
Proceedings Papers

Paper presented at the 1989 SEG Annual Meeting, October 29–November 2, 1989
Paper Number: SEG-1989-1272
.... In exploration, the acquired seismic data g(x,y,t) can be 2-D prestack shot-receiver gathers, 2-D prestack midpoint- offset gathers, or 3-D stacked data. For the purpose of this paper, g(x,y,t) is assumed to be a 2-D prestack midpoint-offset data set. The inverse double p-z transform in the space-time domain...
Proceedings Papers

Paper presented at the 2006 SEG Annual Meeting, October 1–6, 2006
Paper Number: SEG-2006-0530
... d (Thomsen, 1986). Introduction The widespread applic ation of prestack depth migration (preSDM) has forced interpreters to address mis-ties between the seismic depth volume and the well control. The most commonly accepted explanation for the discrepancy has been anisotropy that has not been...
Proceedings Papers

Paper presented at the 1997 SEG Annual Meeting, November 2–7, 1997
Paper Number: SEG-1997-1547
... data, including the interference or tuning effects due to thin beds, and transmission effects through gradient zones, for any laterally variable medium. Unfortunately, such 1547 Practical aspects of inversion technique requires a 3-D elastic finite difference or finite element modeling. Computing 3-D...
Proceedings Papers

Paper presented at the 2001 SEG Annual Meeting, September 9–14, 2001
Paper Number: SEG-2001-0917
...., 1994, 3-D prestack migration of common-offset data: 64th Annual Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts, 1175-1178. Claerbout, J. F., 1985, Imaging the earth's interior: Blackwell Scientific Publications O'Brien, M. J. and Etgen, J. T., 1998, Wavefield imaging of complex structures...
Proceedings Papers

Paper presented at the 2001 SEG Annual Meeting, September 9–14, 2001
Paper Number: SEG-2001-0949
... Summary We present a practical implementation of the one-way wave equation based 3-D prestack implicit finite-difference depth migration(IFDM). Conventional aspects of IFDM, including the Crank-Nicholson method, the continued-fraction expansion of the square-root operator, the compact implicit...
Proceedings Papers

Paper presented at the 2011 SEG Annual Meeting, September 18–23, 2011
Paper Number: SEG-2011-3377
...-receiver prestack depth migration using Dreamlets 0 2 4 0 2 4 Distance (km) Ti m e (s ) (a) 0 2 4 Distance (km)(b) 0 2 4 Ti m e (s ) (c) (d) 0 2 4 Ti m e (s ) (e) (f) 0 2 4 Ti m e (s ) (g) (h) Figure 3: The common source seismogram from survey sinking (on the left)) and from shot domain (on the right...
Proceedings Papers

Paper presented at the 2002 SEG Annual Meeting, October 6–11, 2002
Paper Number: SEG-2002-1288
...-screen propagator, Computational Geosciences, 3, 321-335. Huang, Lian-Jie et al., 1999, Extended local Rytov Fourier migration method, Geophysics, 64, 1535-1545. Biondo Biondi and Palacharla, G., 1996, 3D prestack migration of common azimuth data: Geophysics, 61, 1822- 1832. Acknowledgements The authors...
Proceedings Papers

Paper presented at the 1996 SEG Annual Meeting, November 10–15, 1996
Paper Number: SEG-1996-0439
... continuation operator opreni csg sco correction stefano opreni MIG 2.2 3-D Shot continuation operator Umberto Spagnolini* and Stefano Opreni, Politecnico di Milano (Italy) Summary In this paper we propose a new class of prestack continuation operators that allows the transformation of 3- D seismic data...
Proceedings Papers

Paper presented at the 1996 SEG Annual Meeting, November 10–15, 1996
Paper Number: SEG-1996-0411
... a method for au- tomating iterative 3-D prestack migration analysis using CFP gathers to update travel-time operators. Introduction Restack depth migration has proven to be a useful imag- ing method and has become a part of mainstream seismic technology. However, the utility of prestack depth migra- tion...
Proceedings Papers

Paper presented at the 2008 SEG Annual Meeting, November 9–14, 2008
Paper Number: SEG-2008-0237
... of PSTM CMP gathers with and without interpolation. Figure 3 (a, b, c, d) shows a comparison of the original data at well locations A & B versus the interpolated data at the same locations. Similarly, Figure 3 (e, f, g, h) compares the prestack migrated (non-interpolated) data to the PSTM gathers after...
Proceedings Papers

Paper presented at the 2001 SEG Annual Meeting, September 9–14, 2001
Paper Number: SEG-2001-0957
... and provides a powerful tool in understanding and interpreting the final 3-D image. References Ober, C. C., Oldfield, R. A., Womble, D. E., Romero, L. A. and Burch, C. C., 1997, Practical aspects of prestack depth migration with finite differences, Society of Exploration Geophysicists International Exposition...

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