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3-D poststack time versus depth migration

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Proceedings Papers

Paper presented at the 1994 SEG Annual Meeting, October 23–28, 1994
Paper Number: SEG-1994-1246
.... In addition to utilizing a specific subsalt acquisition geometry, the collective processing strategy will incorporate 2-D time imaging, 2-D poststack depth migration, 2-D prestack depth migration, wide-line profiling, 3-D time imaging, 3-D poststack depth migration and target oriented 3-D prestack depth...
Proceedings Papers

Paper presented at the 1995 SEG Annual Meeting, October 8–13, 1995
Paper Number: SEG-1995-1161
... prospects below the salt. By 1991, we had developed a 3-D poststack depth migration that allowed a prospect to be defined beneath the allochthonous salt sheet on the Mahogany prospect. The potential was large enough to offset the risk of testing such a new play concept. The result was the Mahogany discovery...
Proceedings Papers

Paper presented at the 1994 SEG Annual Meeting, October 23–28, 1994
Paper Number: SEG-1994-0952
... in diffraction stack migration, Geophysics, 68, 1820-1830. k m Figure 1: 2-D Model Figure 3: ear-offset (300 m) section Figure 4: Migrated CMP x=3500 m (eq. 1) Figure 5: Incidence Angle x=3500 m (eq. 2) Figure 2: Shot record x=3500 m 954 AVO migration and inversion: Are they commutable? 4 Figure 6: CMP @ x=3500...
Proceedings Papers

Paper presented at the 2008 SEG Annual Meeting, November 9–14, 2008
Paper Number: SEG-2008-2412
... is an important part of the Controlled Amplitude Controlled Phase (CACP) seismic processing flow. Current practice at ExxonMobil is to apply poststack depth Q-migration in areas affected by anomalous attenuation (Yu, 2002). In this abstract, we propose a new 3-D prestack depth migration algorithm, based...
Proceedings Papers

Paper presented at the 2004 SEG Annual Meeting, October 10–15, 2004
Paper Number: SEG-2004-2036
... migration, or as initial model for prestack depth migration. Fig. 3 demonstrates the CRS tomographic inversion for a synthetic data example. In the top figure the inverted smooth depth model is shown together with reflector elements that correspond to the input CRS attributes, and that were reconstructed...
Proceedings Papers

Paper presented at the 2005 SEG Annual Meeting, November 6–11, 2005
Paper Number: SEG-2005-0404
... with Conventional Seismic Data Figure 3 shows the image from poststack time migration of the data from the CMP line recorded with conventional spread length (less than 3,000 m) along the same line traverse as that of the large-offset seismic line. The data analysis was done using a conventional processing workflow...
Proceedings Papers

Paper presented at the 2005 SEG Annual Meeting, November 6–11, 2005
Paper Number: SEG-2005-2558
...-tomographic inversion D. Neckludov, R. Baina. and E. Landa, OPERA,France. Summary We present a new methodology for velocity model updating. It consists of combination of poststack stereotomography and residual moveout velocity inversion. The former is used for initial model construction and the latest...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2997421
... normalization for wave equation depth migration: Geophysics, 68, 1371 1379, httpsdoi.org/10.1190/1 .1598130. Fletcher, R. P., D. Nichols, R. Bloor, and R. T. Coates, 2016, Least-squares migration Data domain versus image domain using point spread func- tions: The Leading Edge, 35, 157 162, httpsdoi.org/10.1190...
Proceedings Papers

Paper presented at the 1992 SEG Annual Meeting, October 25–29, 1992
Paper Number: SEG-1992-0326
... for which supercomputers cannot always provide the thruput to meet project turnaround requirements. Examples are routine application of 2-D prestack depth migration, more accurate 3-D poststack depth migration, and more accurate 3-D time-space variant DMO. The technologies of the near future, such as full 3...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2997461
... migration Zeng , C. , S. Dong , and B. Wang , 2014 , Least-squares reverse time migration: Inversion-based imaging toward true reflectivity : The Leading Edge , 33 , 962 – 964, 966, 968 , 10.1190/tle33090962.1 . Fletcher , R. P. , S. Archer , D...
Proceedings Papers

Paper presented at the 2001 SEG Annual Meeting, September 9–14, 2001
Paper Number: SEG-2001-0452
... on the seismic section The VSP direct arrival can be used to compute the position of the drill bit on the surface sesimic section. In a 1-D medium, the zero-offset direct arrival is sufficient to compute the depth of the geophone. In general 3-D media, the direct arrival must be recorded for at least three...
Proceedings Papers

Paper presented at the 1999 SEG Annual Meeting, October 31–November 5, 1999
Paper Number: SEG-1999-1138
... ABSTRACT No preview is available for this paper. wavepath migration imagekirchhoff migration image abstract depth seg 1999 Wav epathMigration v ersusKirchho Migration Hongchuan Sun* and Gerard T. Schuster, University of Utah Summary 3-D prestac k Kirc hho migration (KM) smears...
Proceedings Papers

Paper presented at the 14th World Petroleum Congress, May 29–June 1, 1994
Paper Number: WPC-26117
... EXPLORATION CDP 121 Fig. 2. A wave-stack depth-migrated section from the Red Sea area of Saudi Arabia. The interval velocity-depth macromodel used for the migration is shown in Fig. 3. Compare this to poststack depth-migrated section shown on Fig. 4. Note the improvement in the definition of the structural...
Proceedings Papers

Paper presented at the 2008 SEG Annual Meeting, November 9–14, 2008
Paper Number: SEG-2008-3003
... consists of the following steps: 1. Prestack 2-D wave equation migration of the data to generate the cubeC= (x,z,hx,hz) containing the offset vector image gathers. 2. Extract the offset image gather (hx,hz) from the cube for one image point (x,z). 3. Perform the slant stack transform from the offset space...
Proceedings Papers

Paper presented at the 1986 SEG Annual Meeting, November 2–6, 1986
Paper Number: SEG-1986-0330
.... Ray-theory software has been supplemented with wave- theory software, 2-D algorithms with 3-D algorithms, and post- stack processing with prestack processing. This paper focuses on the evaluation of an algorithm designed to do prestack, depth migration using the full acoustic wave equation...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-0585
... and the fractures and vugs around them, this kind of distortion can be enormous. Therefore, the data acquisition must be prestack-migration oriented and should use full-azimuth and high-density acquisition geometry to ensure the original sampling continuously, uniformly, and symmetrically distributed in the 3-D...
Proceedings Papers

Paper presented at the 1992 SEG Annual Meeting, October 25–29, 1992
Paper Number: SEG-1992-0307
... same in-line position. All these results indicate the high degree of accuracy on the migrated output by using this method. The elapsed times for imaging a 128 by 128 CDPs 3-D dataset versus he number of depth levels are listed in Table 1 and those of imaging 1000 layers on various surface CDPs on the Y...
Proceedings Papers

Paper presented at the 2002 SEG Annual Meeting, October 6–11, 2002
Paper Number: SEG-2002-1316
... Summary Generalized screen propagator (GSP) is a wave-equation based, wide-angle wavefield continuation operator and has been applied to both poststack and prestack depth migrations for imaging complex structures. Offset domain GSP migration provides a fast and accurate 3-D wavefield...
Proceedings Papers

Paper presented at the 2012 SEG Annual Meeting, November 4–9, 2012
Paper Number: SEG-2012-0686
... mean value (Figure 3, left). This negative bias was eliminated when the TL-statics were applied (Figure 3, right) to the previously prepared 2009 subset (i.e. to the repeat dataset with the baseline statics). The data were stacked and resulted in 2009 TL volume that was poststack time-migrated...
Proceedings Papers

Paper presented at the 2008 SEG Annual Meeting, November 9–14, 2008
Paper Number: SEG-2008-2181
... compared to the migrations in Figures 4a. The choice of the regularization parameter = 0.1 decreases the residuals and stabilizes the inversion. Figure 4: Zero subsurface-offset image of the 3-D Gulf of Mexico data: a) 3-D shot profile migration, and b) 3-D in- version in the poststack-image domain...

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