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Visual estimation of wavelet phase

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Proceedings Papers

Paper presented at the Offshore Technology Conference, May 5–8, 1997
Paper Number: OTC-8288-MS
...). This indicates that the wavelet can be whitened for all frequencies; however, this is probably invalid. The lack of a crossover may be an effect of migration, which acts as a coherency filter. We chose to only whiten the frequency content up to 80 Hz. The wavelet processing algorithm estimates the minimum phase...
Proceedings Papers

Paper presented at the 1994 SEG Annual Meeting, October 23–28, 1994
Paper Number: SEG-1994-1588
... high-cut filter was applied to the estimated wavelets prior to display. All the wavelet estimates passed the reliability test discussed above. An overall phase number was estimated by the same method used for the well-tie wavelets and is annotated against each of the wavelets in figure 6. A visual...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-1161
... be a difficult task to detect LNAPLs directly by visual inspection of the GPR sections as the LNAPL and surrounding medium dielectric properties usually vary within the same range. Even resorting to the analysis of wave velocity from CMP gathers may be tricky not only due to the above reason but also because...
Proceedings Papers

Paper presented at the 1990 SEG Annual Meeting, September 23–27, 1990
Paper Number: SEG-1990-1665
... the pre-whitening factor distorts the estimated wavelet without any theoretical justification. Secondly, five parameters have to be estimated and visual inspection of the wavelet spectrum is required to determine the bandwidth of the band-pass filter. Alternative methods for computing a deconvolution...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-2644
..., and Burg estimate from prediction filter for same 31 short gates. The colored dash-dot line identified as Burg_long shows 160 ms of the infinitely long autocorrelation computed from the Burg prediction filter for the same long gate. These two curves are not identical but they are visually indistinguishable...
Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-3233
... to within 22° of the deterministic seismic-to-well tie prediction (figures 3, 4 and 5). A 20° phase discrepancy is often difficult to detect visually. For all three datasets the KPE method estimated wavelet phases in close agreement with those of the deterministic method, with the smallest discrepancy just...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216178
... with the dominant frequency of 30Hz and phase rotation of /4 . As shown in Figure 5, the amplitude spectrum and phase information of the estimated wavelet are all preserved, which implies that the proposed method can accurately estimate wavelet even though the observed seismic trace is contaminated by noise...
Proceedings Papers

Paper presented at the 2006 SEG Annual Meeting, October 1–6, 2006
Paper Number: SEG-2006-0998
... to these problems. We now turn to fault point estimation. Figure 3 shows clusters of fault points in PrimeView , a 3D multi- attribute visualization and interpretation system. Notice how well the faults follow the horizon breaks. Next, we map a fault and compare its intersection with a seismic section. We seed...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13818140
.... The wavelets for the conventional and broadband seismic data have been estimated using the inverse Fourier transform of the amplitude of their respective seismic. It can be considered that visually the well to seismic tie is very similar whereas the results of the relative inversion (Figure 3, representing...
Proceedings Papers

Paper presented at the 2003 SEG Annual Meeting, October 26–31, 2003
Paper Number: SEG-2003-2012
... to separate two features that are close together (Sheriff, 2002). Visual resolution of seismic data is directly related to its frequency bandwidth. upstream oil & gas wavelet bandwidth bandwidth rc series bandwidth enhancement workflow workflow well log wavelet resolution wavelet analysis...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 9–11, 2017
Paper Number: SPE-187264-MS
..., calculated with wavenumbers, k 0 = 3 and 5. To facilitate visual interpretation, each CWT phase image is mirrored so the smallest wavelet scales or highest frequencies are at the center and the scales increase outward toward larger wavelet scales or lower frequencies on both left and right sides...
Proceedings Papers

Paper presented at the 1991 SEG Annual Meeting, November 10–14, 1991
Paper Number: SEG-1991-1327
... visually over a limited bandwidth, a phase rotation of the output wave- let. The time shift is introduced by time-sampling, whilst the phase rotation is caused by the spectral smoothing generated by time- windowing. If the seismic wavelet as a whole, and not just the air-gun which is themth derivative...
Proceedings Papers

Paper presented at the SPE Middle East Oil & Gas Show and Conference, March 6–9, 2017
Paper Number: SPE-183860-MS
... for definition). To facilitate visual interpretation, the CWT phase images displayed in the figures of this article are mirrored so the smallest wavelet scales (highest frequencies) are at the center and the scales increase outward with the largest scales (lowest frequencies) on both left and right sides...
Proceedings Papers

Paper presented at the 2006 SEG Annual Meeting, October 1–6, 2006
Paper Number: SEG-2006-1103
... and low impedance) represent more shaley and highly porous sand, respectively. Visual inspection of the bottom panel confirms a relatively more optimistic stratigraphic interpretation, suggesting better reservoir quality, or lower impedance. The phase shifted data suggests reservoir characteristics...
Proceedings Papers

Paper presented at the SNAME 26th Offshore Symposium, April 6–7, 2021
Paper Number: SNAME-TOS-2021-15
.... To control these detrimental effects, the visualization of two-phase flow morphology inside the opaque cavity is a crucial point to improve the physical and numerical models of cavitation. The major challenge in experimental measurements of cavitating flow fields is the fact that multiple scattering...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3213958
...-frequency scales. 5-D data can be challenging to analyse, visual- ize, and interpret. Therefore, we first reduce the data di- mensionality to 4-D by adopting the same wavelet scales over the time and space axes. This is achieved by con- verting the scales to their respective pseudo-frequency and pseudo...
Proceedings Papers

Paper presented at the Offshore Technology Conference-Asia, March 25–28, 2014
Paper Number: OTC-24878-MS
..., or by comparing the seismic trace at the well location with the synthetic seismic trace derived by convolving a wavelet with the calibrated reflectivity log. Visual ties may be required for the following reasons: The well logs are measured at much higher frequencies than the seismic data. Consequently, the well...
Proceedings Papers

Paper presented at the 1996 SEG Annual Meeting, November 10–15, 1996
Paper Number: SEG-1996-1599
.... The conclusions we make are as follows: 1. Statistical black box processes do fail on noisy data sets by allowing the effects of noise to leak into the operators. 2. The output wavelet shape is sensitive to these noise leaks. 3. Visual interactive tools are useful to allow the geophysicist to quality control...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-0164
... a much clear visual indication, Marfurt et al (1998) proposed a multi-trace semblance-based coherence algorithm (C2) which estimates coherence over an arbitrary number of traces, Gersztenkorn and Marfurt (1999) introduced the third generation coherence estimate based on an eigen-structure approach (C3...
Proceedings Papers

Paper presented at the 1993 SEG Annual Meeting, September 26–30, 1993
Paper Number: SEG-1993-1261
... of the reconstructed data that we have tested does not exaggerate any errors introduced by the compression. In fact, seismic migra- tion, which is a smoothing operator, actually reduces the visual error. Deconvolution is more sensitive to any errors, however. In addition, instantaneous phase and frequency sections do...

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