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Determining static corrections from first breaks

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Proceedings Papers

Paper presented at the 2008 SEG Annual Meeting, November 9–14, 2008
Paper Number: SEG-2008-3224
... to compensate for the effects of variations in elevation, weathering thickness, weathering velocity, or reference to a datum." A practical way to derive static corrections for onshore reflection data is first-break tomostatics which determines the near-surface velocity model using first-break tomography...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3426249
... tomographic inversion static correction technology can determine the constraint weight value automatically, it combins with the advantages of the micro logging data which has accuracy information of the shallow layer and the first break which has the feature of strong spatial continuity, it can greatly...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427545
.... surface model is finally obtained so that the S-wave static In this paper, firstly, the pick-up range of first breaks is correction problem in Sanhu-Area is solved very well. determined; secondly, a model is established inversely using the Rayleigh wave dispersion curve and the near-surface TRACE_ NUM...
Proceedings Papers

Paper presented at the 2003 SEG Annual Meeting, October 26–31, 2003
Paper Number: SEG-2003-0086
... is dominant in high-speed layer. For the first breaks, the horizontal component of ray has character of linear distribution, i. e. the first breaks basically are aligned after LVL corrections, and if adding datum statics to the results, it corresponds to correct to uniform datum from A and B point , which...
Proceedings Papers

Paper presented at the 2000 SEG Annual Meeting, August 6–11, 2000
Paper Number: SEG-2000-2044
... correction data are used as the initial condition of the method. The first break time is used for the basic constraint of the method. The residual time shifts can be determined from common-shot, common-receiver and common offset domains. Thus, the global optimized residual static correction values...
Proceedings Papers

Paper presented at the 2002 SEG Annual Meeting, October 6–11, 2002
Paper Number: SEG-2002-2249
... terrain with loose stones or soil. Assuming an equivalent medium with quadratic velocity variation in depth (the quadratic velocity model), we present a travel time inversion method to perform static correction in desert and loose terrains. The method includes fitting first break times using the quadratic...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-2827
... first-break travel times and ray-paths to invert for near-surface velocity structure. Then, static corrections are obtained through interpretation of the resulting velocity structure. In practice, it uses the given first-break travel times to invert for the near-surface velocity structure. The first...
Proceedings Papers

Paper presented at the International Oil and Gas Conference and Exhibition in China, November 7–10, 2000
Paper Number: SPE-64741-MS
... residual static correction values after field sta- tic correction in complex areas, the field near-surface data and field static correction data are used as the initial condition of the method. The first break time is used for the basic constrain of the method. The residual time shifts can be determined...
Proceedings Papers

Paper presented at the 1998 SEG Annual Meeting, September 13–18, 1998
Paper Number: SEG-1998-1313
... by an estimate of model parameters, namely, initial velocities and gradients from nearby areas where data quality is good. The differences between the first break pick times and those calculated from the estimated model are assumed to be delay times and used to calculate refraction statics. The results...
Proceedings Papers

Paper presented at the 2011 SEG Annual Meeting, September 18–23, 2011
Paper Number: SEG-2011-1293
... of reliable first breaks at sufficiently long offsets. We evaluated the long-wavelength static corrections that were obtained by the three previously described methods. The statics corrections from the three methods were comparable. They improved the continuity of the reflectors through the section...
Proceedings Papers

Paper presented at the 2010 SEG Annual Meeting, October 17–22, 2010
Paper Number: SEG-2010-1682
... structures in depth domain by using the inversion method of Rayleigh-wave from multi-component shot gather data and develop a source and receiver static correction method for PS-wave data making use of near-surface P-and S-wave velocity models. The realistic 2D PS-wave shot gather data are adopted to invert...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427135
... tomographic inversion first break A solution for static correction of seismic data in mountainous areas with thick loess XIAO Wang*(NWGI), Yundong YONG (NWGI), Peng WANG (NWGI), Shengtao ZANG (NWGI) Summary combining with other mountain seismic data processing practices, a technical idea of layered...
Proceedings Papers

Paper presented at the 1984 SEG Annual Meeting, December 2–6, 1984
Paper Number: SEG-1984-0424
... to the first break data followed by stack and repoGliun- ing to the correct time provides a time section from rrfmc- tion data similar to that achieved by normal CDP stking This section, in many cases. provides superior nearsurfacc definition to CDP reflection Jatti. Seismic 4 425 Statics determined from near...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3215195
... these picks. - Apply statics to correct for the weathered layers, in effect turning the near-surface into a constant- velocity layer. Picking first arrival also called first break times is mostly automated due to the massive amount of seismic data in modern seismic surveys. Often, though, it requires...
Proceedings Papers

Paper presented at the 2011 SEG Annual Meeting, September 18–23, 2011
Paper Number: SEG-2011-1454
... area or it has been corrected properly. Then, the first break time for the same refraction layer on the CSP gather should be similar to a smoothed time-distance curve. According to this principle, we can determine the accuracy of the datum static corrections. If the accuracy of the datum static...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-1088
... estimation of near-surface layers for static correction Figure 4: Time-offset plot and scanning velocity for zone B in Figure 2. (a) Time-offset plot of the first break picks inside the zone B. The red lines indicate the offset ranges corresponding to each of the layers. (b) Scanning velocity for two layers...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-1093
.... This situation will bring more difficulties to the selection of refraction layer. Solutions: When using the first break of refraction for the statics corrections, in order to ensure tracing the same refraction layer, we should take the 3D block with maximum offset as a reference to determine a reasonable offset...
Proceedings Papers

Paper presented at the 1985 SEG Annual Meeting, October 6–10, 1985
Paper Number: SEG-1985-0299
.... The Dawstat process is a unique interactive method of deriving line length static corrections from first breaks on conventional CDP data. The process is particularly helpful in areas with low signal-to-noise (S/N) ratios or surface-to-refractor time interval extremes such as glacial till, solution collapse...
Proceedings Papers

Paper presented at the International Petroleum Technology Conference, January 19–22, 2014
Paper Number: IPTC-17325-MS
.... This was achieved by applying first-arrival travel time tomography to obtain the shallow velocity information needed to calculate refraction statics corrections. Refraction statics tomography uses the first break travel time picks of the seismic data to derive a velocity model of the near surface. This velocity...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-0264
... field S (such as the constant velocity model and the layered velocity model) is used to determine the ray path A and the theoretical travel time T. Then the travel time difference Page 2129SEG Denver 2014 Annual Meeting DOI httpdx.doi.org/10.1190/segam2014-0264.1© 2014 SEG First-break constrained...

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