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Introduction to velocity analysis and statics corrections

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Proceedings Papers

Paper presented at the 2003 SEG Annual Meeting, October 26–31, 2003
Paper Number: SEG-2003-0086
... be calculated to final datum only by one step. The paper also illustrats implementing meaning and steps of the method and its QC tools . The method has important meaning for solving the problem of static corrections in complex regions. Introduction Because of poor S/N ratio of reflection in complex regions...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13769160
... and corrected before attempting the estimation of surface-consistent residual statics so we divide the workflow into two steps that can be performed automatically and iteratively. The steps consist of CMP velocity/long wavelength statics and residual refraction statics estimates. Subsurface-consistent analysis...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-1074
... of the uphole time t has the advantages, the improvement of the static correction precision, the establishment of the near-surface velocity dataset, and quality control of the shooting well depth. Introduction The uphole time t has been recorded during operation in the field, but it has not been used...
Proceedings Papers

Paper presented at the 2010 SEG Annual Meeting, October 17–22, 2010
Paper Number: SEG-2010-1929
... computation. The application of the method to synthetic data supplied static correction values with error lower than 5%. Introduction Surface wave dispersion analysis is widely used to build near surface S-wave velocity models in the filed of geotechnical engineering and engineering seismology. In recent...
Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-2884
... of correlation imaging condition is the best. The Topspline model including rugged topography and near-surface velocity variations is another test model. The imaging results in two migration conditions (direct migration from rugged topography and migration from plane datum after static correction) are compared...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2997135
... velocity for the near surface using joint analysis of refractions and reflections : 87th Annual International Meeting, SEG, Expanded Abstracts , 2654 - 2659 . Zhu , X. , D. P. Sixta , and B. G. Angstman , 1992 , Tomostatics: Turning ray tomography + static corrections : The Leading Edge...
Proceedings Papers

Paper presented at the 2010 SEG Annual Meeting, October 17–22, 2010
Paper Number: SEG-2010-0238
... are suitable for anisotropic time imaging and producing a high-quality stack. INTRODUCTION Nonhyperbolic moveout analysis is performed under the assumption that the overburden is laterally homogeneous on the scale of spreadlength. However, even gentle structures often contain velocity lenses, whose width...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-1360
... as an integral part of the processing flow. Figure 1. Unresolved statics influences the stack signature (upper part) and produces the typical "W" signature on the horizon velocity analysis panel (bottom). Introduction Near surface heterogeneities, often expressed geologically as buried paleochannels, karsts...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3215925
... error in the first-arrival picking of near offset. The ray tracing tomography method relying on the near offset first-arrival cannot reverse the accurate near-surface structure, and the static correction effect is poor. In this paper, it is proposed that the weathering layer velocity calculated...
Proceedings Papers

Paper presented at the 2005 SEG Annual Meeting, November 6–11, 2005
Paper Number: SEG-2005-2213
... the top of the sub-weathering is sharply undulated and the lateral velocity of the sub-weathering varies significantly. This brings us to the introduction of a smooth intermediate reference datum (IRD) located under the top of the sub-weathering, which helps to further increase the accuracy of statics...
Proceedings Papers

Paper presented at the SPE Russian Oil and Gas Technical Conference and Exhibition, October 3–6, 2006
Paper Number: SPE-104325-MS
... distortion of reflected waves: drastic distortion of seismic events are observed at the heterogeneities' boundary, the frequency content of images changes, and this change causes problems for statics autocorrection. Analysis of near-surface impact correction approaches Known methods of anomalies impact...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13686586
... a computational formula for the velocity analysis and NMO correction of shallow reflection stacking. Secondly, a technical process for building a LVL model is required for statics calculation. Finally, some data processing measures are also required to improve the accuracy of the LVL model. 1) Time-distance...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5837633
... Summary Ground roll of seismic data is mainly composed of surface waves. Surface wave analysis can be used to estimate near surface velocity models useful for static computation. We show, through a Monte Carlo inversion, that the static estimation is robust beyond the uncertainty introduced...
Proceedings Papers

Paper presented at the SPE Middle East Oil & Gas Show and Conference, March 6–9, 2017
Paper Number: SPE-184029-MS
... velocity model correction Saudi Arabia government Colombo surface consistent refraction analysis regularization time slice society of petroleum engineers wadi workflow traveltime long wavelength static Oil and gas exploration in the Middle East has shifted from major structures (e.g...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5901107
... as those areas only affected by near-surface structure. According to accurate analysis of near-surface structure, we can discriminate between true and false gas anomalies and build a solid foundation for solving the static correction problem. Introduction The presence of biogas is characterized by low...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17728712
... 1 SV-P imaging compared to P-SV imaging: analysis of statics and velocities required to create an SV-P image Bruce Karr*, FairfieldNodal, Houston, Texas Summary Standard 3D seismic data recorded into traditional vertical geophones can produce an SV-P converted-wave data volume. However...
Proceedings Papers

Paper presented at the 2010 SEG Annual Meeting, October 17–22, 2010
Paper Number: SEG-2010-1897
... Summary Irregularities in thickness and velocity of near-surface layers may adversely affect seismic reflection images. Static corrections, calculated from near-surface velocity models, are used to remove the effects of the variable near surface. In this paper near-surface layers...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-1098
... times. From these revised delay times a new two layer model is created and static corrections calculated. Introduction Two layer models correct for vertical time to base of weathering and the sub-weathering to datum. The refractor depth and velocity is initially derived from the intercepttime...
Proceedings Papers

Paper presented at the 2006 SEG Annual Meeting, October 1–6, 2006
Paper Number: SEG-2006-0130
.... But, it should be kept in mind that lower signal-to-noise ratio will make velocity picking less accurate. The method is also sensitive to surface inconsistent statics. Trim statics application is prohibited since it destroys the azimuthal travel time information in a gather. Introduction Conventional seismic...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 2–5, 1988
Paper Number: OTC-5755-MS
... analysis and manual reflection statics. The combined use of modeling and direct measurement information to compute near surface seismic statics corrections Gan provide improved seismic sections. INTRODUCTION Work in the 1970's, especially that utilizing side-scan sonar, delineated a wide variety of sub...

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