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3-D common-offset depth migration

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Proceedings Papers

Paper presented at the 2000 SEG Annual Meeting, August 6–11, 2000
Paper Number: SEG-2000-0858
... Summary Exploiting the assumed regularity and symmetry of marine towed streamer data leads to an efficient workflow for 3D prestack depth migration and velocity model estimation. We decompose 3D marine towed streamer data into a set of common-offset common-azimuth volumes. We perform our...
Proceedings Papers

Paper presented at the 2000 SEG Annual Meeting, August 6–11, 2000
Paper Number: SEG-2000-0842
... Summary The double square root (DSR) equation for laterally varying media in midpoint-offset coordinates provides a convenient framework for developing efficient 3-D prestack wave equation depth migrations with screen propagators. Common offset pseudo-screen depth migration is a fast...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 2–5, 1994
Paper Number: OTC-7399-MS
... poststack migration providing the initial field for prestack migration. Some important processing of the unstacked data preceded the 3-D prestack depth migration, including editing of noisy data, deconvolution, and sorting to common offset 3-D data volumes. The sort to common offset volumes allowed us...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-2270
... Summary We present a new implementation of 3D Fourier finite-difference (FFD) depth migration method based on survey sinking (DSR) operator in source-geophone and midpoint-offset hybrid domain. The 3-D DSR downwardcontinuation operator is decomposed into two orthogonal downward-continuation...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 4–7, 1998
Paper Number: OTC-8681-MS
... on a downward-continuation operator derived from the full 3-D prestack downward-continuation operator. Common-azimuth data sets are recursively evaluated at increasing depth levels, starting from the common-azimuth data set recorded at the surface. Common-azimuth data has zero cross-line offset, and thus...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 4–7, 1998
Paper Number: OTC-8815-MS
... reflection point gathers, and depth slices from prestack migrated synthetic data. Multiples produce strong coherent noise in all of these types of migrated images. However, stacking of the common- offset images effectively discriminates against these effects in 2-D, and we can produce a high-quality...
Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-2939
... common binning parameter choices in 3-D NMO correction and prestack migration: offset, measured as the surface distance between source and receiver, and azimuth, similarly taken as the direction of the line connecting the source and receiver. Conventionally, at least two kinds of numerically efficient...
Proceedings Papers

Paper presented at the 2005 SEG Annual Meeting, November 6–11, 2005
Paper Number: SEG-2005-2542
... veloc- ity updates for each CRP gather. The traveltime picking is limited to only a stacked or common-offset volume, and it needs to be done only once; there is no need to do intensive 3-D prestack depth migration. Hence, the computation is much faster than other migration-based velocity analyses. 3-D...
Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-2283
... Summary We present a 3-D automatic migration velocity analysis (MVA) algorithm based on common-azimuth migration (CAM) in the source-geophone implementation, and using differential semblance optimization (DSO). We have successfully tested the algorithm on the 3-D SEG/EAGE overthrust model...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 4–7, 1992
Paper Number: OTC-6826-MS
... candidates for MZO. Here, reflected incnwing throughput by a factor equal to the number of node energy off of a salt dome appears nearly ftat on common- sets. At the end of the entire process, all output fdes are offset sections taken along a concentric circle. Hence, 3-D properly merged into one single fde...
Proceedings Papers

Paper presented at the 2002 SEG Annual Meeting, October 6–11, 2002
Paper Number: SEG-2002-1316
..., Prestack depth migration with acoustic screen propagators, 66th Ann. Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts, 415-418. Jin, S., Mosher, C.C., and Wu, R.S., 2000, 3-D prestack wave equation common offset pseudo-screen depth migration, 70th Ann. Internat. Mtg., Soc. Expl. Geophys., Expanded...
Proceedings Papers

Paper presented at the Safety in Offshore Engineering: Proceedings of an international conference, April 25–26, 1990
Paper Number: SUT-AUTOE-v25-075
... horlzontal profiles ~t 1s of course necessary to acquire selsmlc data over a closely sampled area, such as 1s regularly accomplished for conventlonal 3-D selsmlc surveys For shallow objectives, however, long streamers and large fold of common mld-polnt (CMP) stack are unnecessary and much of the complexity...
Proceedings Papers

Paper presented at the 2003 SEG Annual Meeting, October 26–31, 2003
Paper Number: SEG-2003-1755
... using EOM prestack time migrated images from Line 1 of the LITHOPROBE SNORCLE transect. 0 (3 ) (3 ) (3 ) ( ) / ( ) ( , , ) ( ) ( , , ) Gs gG G G s g S g s D D Dtraces t r r c R W f t p t t ? ? ? ? ? ? ? ? ? ?? ?? ? ? ? ?x x x x x x (4) The optimal common-offset weight is given by (3 ) 0 0 ( ) 2cos...
Proceedings Papers

Paper presented at the 2002 SEG Annual Meeting, October 6–11, 2002
Paper Number: SEG-2002-1220
.... Unfortunately, there is no equivalent simple remedy in 3-D, other than applying the common-offset weight (equation 4) to the shot gathers. Fortunately, the bias is less pronounced in 3-D. SEG Int'l Exposition and 72nd Annual Meeting * Salt Lake City, Utah * October 6-11, 2002 Time Migration Weights Conclusions...
Proceedings Papers

Paper presented at the 2002 SEG Annual Meeting, October 6–11, 2002
Paper Number: SEG-2002-1152
... to the midpoint ray parameter ( p ? ) domain. The common offset data are 3-D Fourier transformed to frequency and wavenumber. For each depth slice in the output image, the appropriate phase shift and migration weight can be applied to each frequency-wavenumber component of the data using the relationship given...
Proceedings Papers

Paper presented at the 2006 SEG Annual Meeting, October 1–6, 2006
Paper Number: SEG-2006-2604
... recorded by streamer. These problems usually hamper the practical applications of full 3-D DSR-based prestack migration. Common-azimuth prestack tau migration The data after Fourier transform along the cross-line offset axis becomes = i yh hk yhh hkuedhkku x yyh yx mm . (6) Inserting equation (6...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17777036
... added to the conventional framework of the land data processing. Presentation Date: Tuesday, September 26, 2017 Start Time: 3:30 PM Location: Exhibit Hall C/D Presentation Type: POSTER datum imaging common-offset panel input data migration modification migrated image upstream oil...
Proceedings Papers

Paper presented at the 1995 SEG Annual Meeting, October 8–13, 1995
Paper Number: SEG-1995-1197
... continuation because of their flexibility in handling 3-D data geometries. Kirchhoff methods can be employed to efficiently migrate data sets with uneven spatial sampling and data sets that are subsets of the complete prestack data, such as common-offset cubes and common-azimuth cubes. However, in principle...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 3–6, 1999
Paper Number: OTC-10984-MS
... prestack migration. Using a 3-D PSPI depth migration of common-receiver gathers, we obtained an image volume that compares favorably to that obtained from conventional CMP stack and 3-D poststack time migration. Since irregularities in the source grid can affect amplitudes in the output image, we devised...
Proceedings Papers

Paper presented at the 2005 SEG Annual Meeting, November 6–11, 2005
Paper Number: SEG-2005-2021
... model building. Han and Wu (2005) have successfully applied this algorithm to 2-D isotropic migration model building. Method The Gaussian beam approximation of a plane wave can be obtained in both the common-offset domain and common- shot domain. In the common-offset domain (Hill, 2001), the plane wave...

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