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Operator antialiasing

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Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5852752
... enhanced if there are complex multiple generators in the subsurface. In this paper, I propose a simple methodology to perform antialiasing in the multiple contribution gather (MCG) domain to reduce the artifacts generated in the SRME predicted multiples. Introduction SRME is a prediction and...
Proceedings Papers

Paper presented at the 2008 SEG Annual Meeting, November 9–14, 2008
Paper Number: SEG-2008-2386
... limits with just three multiply-add operations. One pays a price in bandwidth, however, as the highest input frequency it passes is only half of temporal Nyquist in the event antialiasing is required. Linear interpolation, as used in Claerbout''s original paper, lifts that restriction, but at a cost in...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-2255
... ABSTRACT A common method used to protect Kirchhoff migration operators from aliasing is to apply an operator-dip-dependent lowpass filter to each input trace during summation. This can reduce resolution because higher frequency components of the input data are removed from the migrated image...
Proceedings Papers

Paper presented at the 2004 SEG Annual Meeting, October 10–15, 2004
Paper Number: SEG-2004-1135
... ABSTRACT Antialiasing filters in Kirchhoff migration are designed to eliminate migration artifacts caused by operator aliasing. Unfortunately, they also reduce the amplitude of dipping events. This paper discusses the antialiasing effect on amplitudes and shows how to preserve the dipping...
Proceedings Papers

Paper presented at the 2000 SEG Annual Meeting, August 6–11, 2000
Paper Number: SEG-2000-0806
... imaging quality. Therefore, the importance of antialiasing has drawn increasing attention. The migration antialiasing dip operators are determined by spatial directional derivatives on diffraction hyperboloid surfaces or reflection ellipsoid surfaces depending on the different antialiasing algorithm, in...
Proceedings Papers

Paper presented at the 1991 SEG Annual Meeting, November 10–14, 1991
Paper Number: SEG-1991-1211
... correction upstream oil & gas geophy dmo operator amplitude Antialiasing and Amplitude Preserving 2-D and 3-D DMO: An Integral Implementation Ron Silva* and Paul Haskey, Simon-Horizon Ltd., England SUMMARY A method is described whereby both anti-aliasing and amplitude preserving DMO can be...
Proceedings Papers

Paper presented at the 1992 SEG Annual Meeting, October 25–29, 1992
Paper Number: SEG-1992-0995
... ABSTRACT No preview is available for this paper. migration operator correction equation upstream oil & gas directivity correction summation weighting factor reservoir characterization kirchhoff migration travel time wavefield extrapolator directivity factor impulse...
Proceedings Papers

Paper presented at the 1987 SEG Annual Meeting, October 11–15, 1987
Paper Number: SEG-1987-0729
... ABSTRACT No preview is available for this paper. christopher liner operator trsoe zero-offset section operrtion spatial equation reservoir characterization trroe modeling operator upstream oil & gas colorado school multichannel reflection data joshua ronen amplitude...
Proceedings Papers

Paper presented at the 1988 SEG Annual Meeting, October 30–November 3, 1988
Paper Number: SEG-1988-1113
... everett mobley operator-aliasing noise Amplitude and Antialiasing Treatment in (x-t) domain DMO Craig J. Beasley and Everett Mobley, Western Geophysical s 17.4 SUMMARY Kirchhoff-summation types of algorithms give an efficient and practical means for accomplishing dip-moveout (DMO). In analogy with...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-0584
...Dip-adaptive operator anti-aliasing for Kirchhoff migration Zhou Yu*, John Etgen, David Whitcombe, Linda Hodgson and Hui Liu, BP Summary Independent from data and image aliasing, operator aliasing occurs when the input data spacing is too coarse and the frequency is too high for the steep migration...
Proceedings Papers

Paper presented at the CORROSION 2001, March 11–16, 2001
Paper Number: NACE-01291
... ABSTRACT Removing DC trends before calculating power spectral densities is a necessary operation, but the choice of the method is probably one of the most difficult problems in electrochemical noise measurements. The procedure must be simple and straightforward, must effectively attenuate the...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-2344
... along a diffraction surface, they are fil- tered for waveform phase shaping and pre filtered in preparation for the antialiasing operation applied during summation. Since the inte- gration process shifts the waveform shape, the filter works restoring it. The anti-aliasing filter is applied in three...
Proceedings Papers

Paper presented at the 2003 SEG Annual Meeting, October 26–31, 2003
Paper Number: SEG-2003-1091
...: SEP 80, 447 490. Silva, R., 1992, Antialiasing and the application of weighting fac- tors in Kirchhoff migration: 62nd Ann. Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts, 995 998. Sun, J., and Bernitsas, N., 1999, Antialiasing operator dip in 3D prestack Kirchhoff time migration - an exact...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-0956
... suboptimal further processing. Matching pursuit Fourier interpolation (MPFI) is a beyond-aliasing interpolation technique for single- component seismic data. The antialiasing capabilities of the method can be improved by using priors, which are typically derived from the lower frequencies in the data, and...
Proceedings Papers

Paper presented at the 2010 SEG Annual Meeting, October 17–22, 2010
Paper Number: SEG-2010-3662
... data to extract antialiasing prediction filters and then interpolates high frequencies be- yond aliasing. Claerbout (1992) treated Spitz s method as a prediction-error filter in the original t-x domain. Porsani (1999) proposed a half-step prediction-filter scheme that makes the interpolation process...
Proceedings Papers

Paper presented at the International Petroleum Technology Conference, December 7–9, 2009
Paper Number: IPTC-13998-ABSTRACT
... is coarse. One of the key reasons for the loss of bandwidth with large midpoint bins is due to the anti-alias filtering of the migration operators that must be done. As discussed by Abma et al. (1999), such filtering is needed to prevent the generation of artifacts. The resolution implications are...
Proceedings Papers

Paper presented at the 2008 SEG Annual Meeting, November 9–14, 2008
Paper Number: SEG-2008-2512
... the essential theoretical equivalence of the two using a simple three line mathematical argument. After that I look at similarities and differences in the implementation of the two methods, from deghosting, obliquity and antialiasing, to memory requirements and out-of-core pipelining, and finally...
Proceedings Papers

Paper presented at the 2003 SEG Annual Meeting, October 26–31, 2003
Paper Number: SEG-2003-1130
... Summary Operator/Imaging aliasing introduced in Kirchhoff migration is often tackled by trace tapering, aperture truncation or time and offset-variant filtering. The latter approach is the most suitable. However, most implementations and published results using this technique are derived for...
Journal Articles
SPE Drilling & Completion (2021)
Paper Number: SPE-204032-PA
Published: 25 February 2021
... back-drive dynamic drilling conference drillstring design back-drive event bit rotation speed torque drilling operation texas exhibition rotation speed spe annual technical conference oscillation frequency spe iadc drilling conference In North American shale drilling applications...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 4–7, 1998
Paper Number: OTC-8680-MS
... rsi bandwidth technology conference output space input data interpolation operator frequency input sample theorem waveform output buffer reservoir characterization nyquist frequency upstream oil & gas samphg unambiguous signal recovery trajectory sample interval normal...

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