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NMO stretching

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Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-0234
... Summary Wavelet stretching due to NMO correction of seismic gathers causes problems in AVO. Coupled with the degrading action of wavelet stretching is offset dependent tuning for thin beds. Even though tuning is inherent in the data before NMO correction, its effect on AVO is more obvious...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-0582
... distribution computation nmo stretch formula geometry reservoir characterization equation 1 rms dependence maximum stretch factor acceptable average stretch factor NMO stretch in survey design and processing Gijs J. O. Vermeer, 3DSymSam Geophysical Advice Summary In seismic survey design...
Proceedings Papers

Paper presented at the 2011 SEG Annual Meeting, September 18–23, 2011
Paper Number: SEG-2011-4040
...- and carbonate-rich strata. The conventional NMO-correction, which processes the data sample-by-sample, results in the well-known decrease of frequency content and amplitude distortion through stretch, which both lowers the seismic resolution and hinders ??-µ? and AVAz analysis. We reformulate the classic...
Proceedings Papers

Paper presented at the 2011 SEG Annual Meeting, September 18–23, 2011
Paper Number: SEG-2011-1435
... ABSTRACT Velocity analysis procedures are mostly based on NMO stack panels and amplitude semblances to detect the maximum values associated with the correct velocity to be interpreted. However, a T-X mute function needs to be applied to avoid stretched far offset traces contributing...
Proceedings Papers

Paper presented at the 2003 SEG Annual Meeting, October 26–31, 2003
Paper Number: SEG-2003-0215
... ABSTRACT Summary A processing and interpretation approach has been developed that avoids NMO stretch for a specified target horizon. We call this approach seismic Wide-Angle processing (SWAP)TM. Both conventional pre-stack attributes and high-resolution attributes for seismic data at offsets...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5858465
... Summary It is very important to preserve the seismic data with large incidence and long offset in estimation of the velocity and anisotropy parameters. The conventional NMO correction is a point by point processing with approximate time-distance equation, which leads to serious stretching...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427094
... NMO correction is one of the main steps in seismic data processing and is implemented time sample by sample after seismic velocity analysis. However, the sample-based strategy would introduce a phenomenon named as NMO stretching. To avoid the NMO stretching, we propose to perform the NMO...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5880141
... Summary We present a novel method that optimizes CMP stacking and reduces the effects of "NMO stretch" by replacing conventional NMO and stack with a regularized inversion to zero offset. We use shaping regularization to achieve a stack that has a denser time sampling and contains higher...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17791492
... factor extracted from seismic data is helpful to reservoir characterization and hydrocarbon detection. We often extract Q factor from VSP data, pre-stack seismic data and post-stacked seismic data. But there is not a method to consider the normal moveout (NMO) stretch in time migration gathers...
Proceedings Papers

Paper presented at the 2005 SEG Annual Meeting, November 6–11, 2005
Paper Number: SEG-2005-0293
... Summary To better study frequency related effects by fluidsaturation, we developed a frequency dependent AVO analysis. Comprehensive tests on full waveform synthetics and observations from the Teal South OBS data set confirmed that NMO stretch could distort both frequency and amplitude...
Proceedings Papers

Paper presented at the 2008 SEG Annual Meeting, November 9–14, 2008
Paper Number: SEG-2008-1018
.... The filter design is based on an analytical expression for the NMO-stretch factor for PS data and the P- and S-wave quality factors, Qp and Qs. We also provide a workflow to estimate Qs from the converted-wave data. Using model data, we demonstrate that our method enhances the resolution of far-offset data...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17790238
... ABSTRACT Q factor is a powerful tool for reservoir characterization and hydrocarbon detection. Q factor estimations are often obtained from VSP data, poststack data and prestack data. There are few methods to extract the Q factor from time migration gathers with the NMO stretch. In this paper...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5837472
... inversion. Current methods of AVO inversion use the seismic data after NMO correction. However, NMO stretch from NMO correction will introduce error for inversion. This paper develops an improved PP and PS AVO joint inversion method using the seismic data before NMO correction to invert the parameters more...
Proceedings Papers

Paper presented at the 2000 SEG Annual Meeting, August 6–11, 2000
Paper Number: SEG-2000-2177
... deconvolution can be of comparable size to NMO stretch. Removing slow-traveling low frequency components from wavelets reduces anelastic stretch. Trace by trace spiking deconvolution appears to overcompensate for anelastic stretch at large offsets. Introduction Wavelet stretch caused by NMO correction...
Proceedings Papers

Paper presented at the 2004 SEG Annual Meeting, October 10–15, 2004
Paper Number: SEG-2004-0219
... that deterministically correct for the effects of NMO stretch and absorption (Q). It is critical that both steps are applied. While NMO stretch compensation plays the key role in balancing near and far-offset spectra, it will reduce the far-offset amplitudes and suppress AVO anomalies if frequency-dependent absorption...
Proceedings Papers

Paper presented at the 2003 SEG Annual Meeting, October 26–31, 2003
Paper Number: SEG-2003-0321
... these challenges, the seismic data was processed using a new algorithm that promised to handle the long offset information advantageously. This algorithm is a new process that is meant to eliminate NMO stretch effects in the stack. Since fluid estimation was of such concern in this dataset, the algorithm was also...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5919929
..., but at the same time decreasing the precision and resolution of inversion result due to AVO effects and NMO stretching. To solve these problems mentioned above, this paper applies a new efficient method to obtain zero-offset gathers (namely pure-P data) and its PI inverted from pre-stack data. In contrast...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-1562
... and the characteristics of the subsurface rocks, however, the conventional methods have many drawbacks, such as signal distortion caused by NMO stretching, uncertainty of well to seismic calibration in model building affected by man-made factors, and so on. The recent wave equation inversion (WEI), based on seismic wave...
Proceedings Papers

Paper presented at the 2010 SEG Annual Meeting, October 17–22, 2010
Paper Number: SEG-2010-0368
... to increase resolution and aid in mitigating NMO stretch, followed by 3-parameter AVA inversion and impedance inversion to rock properties. By computing bulk modulus and Young’s modulus from the elastic properties Vp, Vs and density, porosity and lithology can be predicted. A case study is performed...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13843157
...High-resolution recursive stacking using plane-wave construction Kelly Regimbal* and Sergey Fomel, The University of Texas at Austin SUMMARY We propose an approach to normal moveout (NMO) stacking, which eliminates the effects of NMO stretch and restores a wider frequency band by replacing...

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