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Operator antialiasing

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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-2000-0981
... ways to implement a parallel Kirchhoff prestack time migration. Three basic strategies are discussed, and their parallel scalability analyzed. The impact of operator antialiasing on parallel performance is considered for two common methods of antialiasing protection. A timing model of the parallel...
Proceedings Papers

Paper presented at the 1999 SEG Annual Meeting, October 31–November 5, 1999
Paper Number: SEG-1999-1496
... direction when forming 2-D common-offset sections by binning. SEG 1999 Expanded Abstracts An alternative to cross-spreads for imaging wide-azimuth 3-D surveys Deriving operator antialiasing conditions by converting integrals to summations Equation (4) indicates how to accurately approximate two...
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...
Proceedings Papers

Paper presented at the 1997 SEG Annual Meeting, November 2–7, 1997
Paper Number: SEG-1997-1086
... iasing Antialiasing of Kirchhoff operators can be accomplished by aperture control and operator dip filtering, 1087 3-D Prestack Migration but this has the undesirable effect of suppressing steep-dip contributions to the image. We used three different implementations of antialiasing for 3-D prestack...
Proceedings Papers

Paper presented at the 2000 SEG Annual Meeting, August 6–11, 2000
Paper Number: SEG-2000-0806
... the 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...
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...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-2344
... that this is applicable to time as well as depth migration algorithms. Before the data are stacked along a diffraction surface, they are filtered for waveform phase shaping and pre–filtered in preparation for the antialiasing operation applied during summation. Since the integration process shifts the waveform shape...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5852752
... are 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...
Proceedings Papers

Paper presented at the 1995 SEG Annual Meeting, October 8–13, 1995
Paper Number: SEG-1995-0041
... to different lower rates, synchronizing the free-running signatures with the seismic source, filtering out unwanted frequencies for improving S/N ratio and constructing software antialiasing filters. These multifunctions are achieved simultaneously by a one-time FIR (finite impulse response) operation between...
Proceedings Papers

Paper presented at the 1987 SEG Annual Meeting, October 11–15, 1987
Paper Number: SEG-1987-0729
... of noise, Proo. I.R.E., 37, 10-21. x 5 : i FIG. 1. Impulse response of the smear stack operator (3 impulses) generated using Hale s method. FIG. 2. Impulse response of the partial modeling opera- tor generated by transpos- ing Hale s method. Runtime parameters notation. 732 Spatial antialiasing 5...
Proceedings Papers

Paper presented at the 1992 SEG Annual Meeting, October 25–29, 1992
Paper Number: SEG-1992-0995
... response including the directivity corm&m. This operator will automatically cut off at 8 =90 degrees, i.e. cos (x 12 ) = 0, thus selecting the correct migration apertum. FK plots of the above are needed to demonstrate anti- aliasing and evanescent energy rejection properties. 997 4 Antialiased Kirchhoff...
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...
Proceedings Papers

Paper presented at the 2008 SEG Annual Meeting, November 9–14, 2008
Paper Number: SEG-2008-2512
... 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 comparing their relative computational cost. Of particular note, I show that (1) no spatial FFT padding is required to suppress...
Proceedings Papers

Paper presented at the 2010 SEG Annual Meeting, October 17–22, 2010
Paper Number: SEG-2010-3662
...). One important approach to trace interpolation is prediction interpolating methods, mainly an extension of Spitz’s original method, which uses low-frequency non-aliasing data to extract antialiasing prediction filters and then interpolates high frequencies beyond aliasing. Claerbout (1992) treated...
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...
Proceedings Papers

Paper presented at the 1997 SEG Annual Meeting, November 2–7, 1997
Paper Number: SEG-1997-1119
... ABSTRACT No preview is available for this paper. expl procedure azimuth geometry interpolation aliased operator intemat reservoir characterization receiver traverse operator grid cell geophy fourier transform beasley kirchhoff operator mobley upstream oil & gas dmo...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3214151
... for the steep migration operator summation trajectory. A reduced CDP interval in migration image can mitigate this problem, but with additional computation and GPU memory cost. For better data quality, we implement the antialiasing with the triangle filter following Lumley et al. (1994), which was first...
Proceedings Papers

Paper presented at the 1998 SEG Annual Meeting, September 13–18, 1998
Paper Number: SEG-1998-1171
... the locality of the Kirchhoff migration operator to restrict the processing to a portion of the whole model (target), according to the features of interest. This saves computing resources. The migration proceeds one shot gather at a time. We use a triangle antialiasing operator (Claerbout, 1992). Traveltimes...
Proceedings Papers

Paper presented at the 2003 SEG Annual Meeting, October 26–31, 2003
Paper Number: SEG-2003-1091
... 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 solution: 61st Mtg., Eur. Assn. Geosci. Eng., Expanded Abstracts, Ses- sion:1052...

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