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Gabor wavelet

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Proceedings Papers

Paper presented at the 2003 SEG Annual Meeting, October 26–31, 2003
Paper Number: SEG-2003-2207
... is nonstationary. Gabor deconvolution (Margrave and Lamoureux, 2002) includes energy dissipation and velocity dispersion in its time-frequency operator to precisely estimate nonstationary wavelets. To verify the accuracy of wavelets estimated from surface data by Gabor deconvolution, we compare them to Q-filtered...
Proceedings Papers

Paper presented at the 2002 SEG Annual Meeting, October 6–11, 2002
Paper Number: SEG-2002-2210
.... Least squares fitting our model to the Gabor-transformed seismic trace yields a Q-value and an estimate of the source signature, hence an estimate of the nonstationary wavelet. These estimates lead to a smoothed version of the magnitude of the Gabor spectrum of the seismic trace, from which a least...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5813837
... from the Gabor wavelet representation of prestack data. Then, combining the feature with pattern recognition techniques, seismic facies analysis can be achieved through unsupervised or supervised learning. We tested the effectiveness of our method with application to the wide-azimuth data form LZB...
Proceedings Papers

Paper presented at the 2004 SEG Annual Meeting, October 10–15, 2004
Paper Number: SEG-2004-1929
... ABSTRACT Frequency domain thin bed analysis of seismic data combines spectral decomposition and tuning theory to reveal thin beds and estimate their thicknesses. Spectral decomposition is a filter bank process whose filters are narrowband complex wavelets. Gabor and Morlet wavelets provide...
Journal Articles
Int. J. Offshore Polar Eng. 13 (04).
Paper Number: ISOPE-03-13-4-260
Published: 01 December 2003
... stresses employing the Gabor wavelet transform. Similarly, we have employed the Gabor wavelet for determining the magnitude and frequencies hidden in the impact force as well as the freak wave time series. The Morison method (Kim et al., 1997) can simulate the hor- izontal particle velocities of the freak...
Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-2472
...) proposed the IF matching (IFM) method, which iteratively modifies the causal attenuation operator (Aki and Richards, 1980) so that the IF at the envelope peak of the reference pulse is closest to that of the target pulse, and Q can be derived. geophysics seg houston 2009 gabor wavelet estimation...
Proceedings Papers

Paper presented at the 2004 SEG Annual Meeting, October 10–15, 2004
Paper Number: SEG-2004-1547
...-Morlet Wavelet Theory A real seismic trace, s(t), is sampled by correlation with as elected set of Gabor wavelets tg jk , where tita j jj eetg 2 )( = , (1) jjjk ttgtg = , (2) jjk tkt , Kk 2,1,0 (3) 0 jj = , Nj 3,2,1,0= (4) The complex trace generated from the real trace s(t) (as defined by Taner...
Proceedings Papers

Paper presented at the 2006 SEG Annual Meeting, October 1–6, 2006
Paper Number: SEG-2006-1610
... are now well-known and widely-used methods to analyze non-stationary data such as seismic records. Gabor (1946) developed his Joint Time Frequency Analysis method (JTFA) by using an exponentially-tapered complex cosine wavelet with central frequencies linearly spaced on the frequency axis. Morlet, et. al...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-0046
... detectors as a 2D form Gabor wavelet, which is often used as an orientation detector in many applications in the realm of imaging process- ing (see Jain et al., 1997). Field (1987) proposed an alternative to the Gabor filter, the log-Gabor filter, which is an improved version. The log-Gabor filter has...
Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-1048
... at the center of a thin bed or wedge as a function of thin bed thickness. Both figures use the same 25 Hz Gabor wavelet, and Figure 3a uses the same model as Figure 2. The center of the wedge is where the reflection wavelets interfere equally. Where the interference is completely constructive, the instantaneous...
Proceedings Papers

Paper presented at the 2012 SEG Annual Meeting, November 4–9, 2012
Paper Number: SEG-2012-0665
... effects in an average sense. In this paper, the Gabor deconvolution is implemented to enhance seismic resolution by eliminating the source wavelet and the attenuation process simultaneously. This algorithm is derived from an approximate factorization of a nonstationary trace model based on Gabor transform...
Proceedings Papers

Paper presented at the 2006 SEG Annual Meeting, October 1–6, 2006
Paper Number: SEG-2006-2812
... ABSTRACT The Gabor deconvolution aims at the simultaneous elimination of the wavelet and the attenuation effects, both endowed with the minimum phase character. In the absence of an accurate estimation of Q, the phase component of the Gabor deconvolution operator is designed with the help...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-0101
... or under-compensation for amplitude compensation, while Gabor deconvolution is based on the assumption of minimum phase wavelet which deviates from real conditions to some extent, therefore its application is limited. We proposed a novel method which combines merits of inverse Q filtering and Gabor...
Proceedings Papers

Paper presented at the 2004 SEG Annual Meeting, October 10–15, 2004
Paper Number: SEG-2004-1961
... by this finding, we simulated a synthetic nonstationary vibroseis wavelet in a constant-Q medium by nonstationary convolution and again we found it to be close to minimum phase. Furthermore, we applied minimum-phase Gabor deconvolution to the sweep-removed vibroseis record and correlated vibroseis data. We...
Proceedings Papers

Paper presented at the 1995 SEG Annual Meeting, October 8–13, 1995
Paper Number: SEG-1995-1342
...- ing parameter related to time t. From a comparison of this definition with eq. (3) we see that the multiple filter tech- nique is essentially a special case of the wavelet transform with the kernel wavelet known as the Gabor wavelet A P P L I C A T I O N Synthetic data We use a synthetic seismic...
Proceedings Papers

Paper presented at the 2011 SEG Annual Meeting, September 18–23, 2011
Paper Number: SEG-2011-1030
... with travel time. seismogram nonstationary seismic trace source wavelet molecular-gabor transform spectrum upstream oil & gas wavelet nonstationary seismic data travel time geophysics seismic trace asbm similarity reservoir characterization crewe research report seismic data...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5840550
... Summary An amplitude preserving resolution-enhancement method (APREM) is proposed on basis of changing wavelet model and adaptive Gabor transform. Several application scenarios of the technique are summarized on basis of some case studies. The implement of algorithm is as follows. Firstly, we...
Proceedings Papers

Paper presented at the 2003 SEG Annual Meeting, October 26–31, 2003
Paper Number: SEG-2003-0714
... of the propagating wavelet. This process is motivated by a simple model of the constant Q attenuation process that allows the forward Q filter to be written as a pseudodifferential operator applied to the seismic reflectivity. We have shown that the Gabor transform approximately factorizes this pseudodifferential...
Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-2486
... into several stationary parts using the Gabor molecule windows produced adaptive to the analyzed signal. By this way, we change the nonstationary problem to be a stationary one, and then give the AFBT in detail and demonstrate its effectiveness on synthetic and real seismic data. Changing wavelet model...
Proceedings Papers

Paper presented at the SPWLA 47th Annual Logging Symposium, June 4–7, 2006
Paper Number: SPWLA-2006-J
... controlled by the length of the moving window selected. Other techniques such as the Gabor Wavelet Transform (GAWT) report events true to depth on the original log. The Maximum Entropy Spectral Analysis model (MESA) is a predictive tool of the spectral content within a moving depth window of preset length...

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