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Time-variant spectral whitening

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Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5840550
... wavelets. According to the nonstationary characteristics, many methods were proposed to deal with attenuation. Inverse Q-filter (Hale, 1982) and time-variant spectral whitening (TVSW) (Gibson, 1982) are the commonly used methods. In practice, it is difficult to obtain accurate Q due to the complexity...
Proceedings Papers

Paper presented at the 2005 SEG Annual Meeting, November 6–11, 2005
Paper Number: SEG-2005-0494
...-consistent, minimum phase deconvolution followed by multiple passes of prestack and/or poststack time-variant spectral whitening (TVSW) has become quite popular. Although years of experience have shown that the TVSW algorithm is amazingly robust, detractors are quick to point out that it lacks a certain...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17782207
... this information. Bandpass frequency filtering, Time-variant spectral whitening, F-K or tau-p filtering are widely used to attenuate regular noise, but with infidelity and not amplitude preservation. A robust mathematics morphological filter is presented in this paper with no need to transform other domain...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13961807
... on the Borga frequency slices. The process can lead to better results in AVO analysis and inversion. The transform is a natural choice for time-variant spectral whitening. By applying an amplitude gain function for each frequency slice, one can compensate for time and frequency dependent amplitude attenuation...
Proceedings Papers

Paper presented at the 2010 SEG Annual Meeting, October 17–22, 2010
Paper Number: SEG-2010-3789
... backscattering. As such, any dip filtering that exploits the linear moveout criterion has limited success in attenuating surface waves even with sufficiently small trace interval to prevent spatial aliasing. (3) The combination of time-variant spectral whitening (TVSW), f-x dip filtering, and predictive...
Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-1004
... processed to final migrated volumes by Hanxing Lu and Kevin Hall of the CREWES Project. The processing flow for both PP and PS Manitou Lake data includes deconvolution, time-variant spectral whitening and FD migration after stack. In this study, three well logs: A11-17, C10-17 and C7-16 were used...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-1943
... Ltd. Vertical and radial migrated stack were generated. The processing flow for the PP section was conventional and included surface consistent deconvolution, time-variant spectral whitening, refraction statics, trim statics, CDP stack and migration. The processing flow for the PS section included...
Proceedings Papers

Paper presented at the 2010 SEG Annual Meeting, October 17–22, 2010
Paper Number: SEG-2010-1462
... exhibit phase distortions at the point of overlap. Time-variant spectral whitening: The other method is to use time-variant spectral whitening (TVSW). The method involves passing the input data through a number of narrow band-pass filters and determining the decay rates for each frequency band...
Proceedings Papers

Paper presented at the 1997 SEG Annual Meeting, November 2–7, 1997
Paper Number: SEG-1997-1047
... to this signal the resulting amplitude spectra appear as shown in Figure 1. Power spectra of these models are also shown in Figure 1. In many instances seismic data are put through a time-variant spectral whitening (TVSW) process after deconvolution (Yil- maz, 1987). TVSW whitens, or balances, the spectral...
Proceedings Papers

Paper presented at the 1998 SEG Annual Meeting, September 13–18, 1998
Paper Number: SEG-1998-0009
...). However, further attempts to improve the resolution of the data by using statistical deconvolution techniques (time variant spectral whitening) adversely affected the correlation (decrease from 0.88 to 0.78). Conclusions Significant quantities of seismic data acquired over the B pool reservoir demonstrate...
Proceedings Papers

Paper presented at the 2011 SEG Annual Meeting, September 18–23, 2011
Paper Number: SEG-2011-1030
..., 1987). In this paper, we focus our study on the nonstationarity caused by the frequency- dependent attenuation, i.e., the so called Q effect. Inverse Q-filter (Gelius, 1987; Hargreaves, 1991; Neil, 1992; Samuel, 1993; Wang, 2006) and time-variant spectral whitening (TVSW) (Yilmaz, 1987...
Proceedings Papers

Paper presented at the 2003 SEG Annual Meeting, October 26–31, 2003
Paper Number: SEG-2003-0714
... post stack because, as with any data whitening, the CMP stacking process de-whitens requiring another pass of deconvolution after stack. In Figure 7, exponential gain, surface-consistent Wiener deconvolution, and TVSW (time-variant spectral whitening) were used in the pre stack flow and TVSW was used...
Proceedings Papers

Paper presented at the 1999 SEG Annual Meeting, October 31–November 5, 1999
Paper Number: SEG-1999-0617
... and 9m datasets. Immediately before cmp stack, both datasets were aggressively whitened (to 90 Hz) with TVSW (time variant SEG 1999 Expanded Abstracts The ghost in the spectrum spectral whitening), The extent of spectral dewhitening in stacking is shown in these average amplitude spectra. Assuming both...
Proceedings Papers

Paper presented at the 2006 SEG Annual Meeting, October 1–6, 2006
Paper Number: SEG-2006-2832
... lower frequencies. Top: An appropriate time variant band pass filter is applied after stack. Bottom: spectral whitening is applied before stack while the same filter is applied after stack. Note that reverberations and resonated frequencies are controlled, signal-to-noise ratio is improved...
Proceedings Papers

Paper presented at the 2006 SEG Annual Meeting, October 1–6, 2006
Paper Number: SEG-2006-0500
..., and after each process, examined the average amplitude spectrum, time-variant spectrum, and the autocorrelogram for assessment and quality control of the processing parameters (Yilmaz, 2001). The signal processing includes t-squared scaling, predictive deconvolution, time-variant spectral whitening, trace...
Proceedings Papers

Paper presented at the 2005 SEG Annual Meeting, November 6–11, 2005
Paper Number: SEG-2005-1658
... geological requirement wavelet seismic trace variance deconvolution amplitude spectrum upstream oil & gas different time window migrated section space variant spectrum reservoir characterization reflection coefficient spectrum resolution improvement )1()exp 0 n N n n k faffW...
Proceedings Papers

Paper presented at the 1995 SEG Annual Meeting, October 8–13, 1995
Paper Number: SEG-1995-1498
... with unit prediction lag to increase and preserve vertical resolution, and remove short-period multiples and reverberations. Design the deconvolution operator using a single time gate and compensate for nonstationarity by time-variant spectral whitening (Step i). No data-dependent scaling should be applied...
Proceedings Papers

Paper presented at the 1987 SEG Annual Meeting, October 11–15, 1987
Paper Number: SEG-1987-0433
... results; 011 of which ore conveniently performed in QI interactive environment. These steps are discussec next and demonstrated with the aid of a seismic data excrnple . Data Preparation: The poststock processing of the datoset includes &convolution, -3-U migration, time- variant spectral whitening...
Proceedings Papers

Paper presented at the 2011 SEG Annual Meeting, September 18–23, 2011
Paper Number: SEG-2011-1207
... does not change with travel time; and inverse-Q filter, time- variant spectral whitening, Margrave and Lamoureux s Gabor deconvolution, and Gao and Wang s resolution enhancement method based on the changing wavelet model of the seismogram, which are based on nonstationary seismic trace model. However...
Proceedings Papers

Paper presented at the Abu Dhabi International Petroleum Exhibition and Conference, November 10–13, 2014
Paper Number: SPE-171847-MS
.... In the one, a mild lower frequency time variant spectral whitening for the Arab level and below was applied to improve seismic mapping capability laterally. The second one aimed to increase (realistically) the seismic higher frequency bandwidth. All these frequency bandwidth broadening was tightly controlled...

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