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Plotting raypaths for primary and multiple reflections

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Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-3068
... 3DGSMP (a) Crossline stack and (b) CMP gather Figure 5 Data after 3DGSMP (a) Crossline stack and (b) CMP gather, the black arrow indicates primary reflections revealed un-attenuated after multiple attenuation Figure 6 Difference plots showing multiples attenuated through use of 3DGSMP for (a) Crossline...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 3–6, 2004
Paper Number: OTC-16941-MS
... imaging step, the result is input to the inverse focal transform leading to the desired multiple-free output. First results indicate that combined prediction and imaging may lead to the next paradigm shift in multiple removal. Figure 1: a) Feedback model for primary reflections (m > 0) and surface...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2998041
... the Acoustical Society of America , 121 , 2637 – 2643 , 10.1121/1.2713673 . Snieder , R. , K. Wapenaar , and K. Larner , 2006 , Spurious multiples in seismic interferometry of primaries : Geophysics , 71 , no . 4 , SI111 – SI124 . Tao , Y. , and...
Proceedings Papers

Paper presented at the 2005 SEG Annual Meeting, November 6–11, 2005
Paper Number: SEG-2005-0448
... individually, for example at around 0.95 s, 1.2 s, and 1.5 s. Figure 3: Acoustic impedance (AI), reflectivity (R), and combined reflectivity (CR) logs in time. Peaks in the CR log correspond to potential multiple generators, as indicated. The rightmost panels show primary (P), multiple (M), and total (P+M...
Proceedings Papers

Paper presented at the 2011 SEG Annual Meeting, September 18–23, 2011
Paper Number: SEG-2011-3531
... sparse inversion shot gather matrix near-offset data exxonmobil upstream research company reservoir characterization reflection estimation obc data receiver water bottom surface-related multiple verschuur raypath primary estimation upstream oil & gas Primary estimation on OBC data...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3426847
... We extend applications of a recently developed method for internal multiples prediction (van der Neut and Wapenaar, 2016) to a streamer dataset from a shallow-water survey. The internal multiples being predicted are all the internal multiples arriving later than a reflection from a fictitious...
Proceedings Papers

Paper presented at the International Petroleum Technology Conference, January 19–22, 2014
Paper Number: IPTC-17551-MS
... Abstract Interbed multiples occur in all types of seismic datasets and are difficult to address. These multiples can appear very similar to primaries due to comparable velocities, and may be difficult to differentiate from primary energy and/or distort the amplitude of primary reflections...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5882419
... to the interaction with deeper non-horizontal reflectors. When both the sea bottom and the deeper structures are non-horizontal, such traveltime differences increase in particular with the number of bounces in the water layer. Figure 1: Raypaths for two water-layer-related multiples, with same source...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17404081
... multiple panel to the primary-only reflections and thus correlate to the lithologic interfaces in the impedance log. Figure 4: (a) Near-stack seismic data is plotted by the (b) progressive multiple subtraction panel for correlating seismic data to the primary-only synthetic seismogram. Impedance logs shown...
Proceedings Papers

Paper presented at the International Petroleum Technology Conference, December 7–9, 2009
Paper Number: IPTC-13363-MS
... the rough geomorphology of the water bottom, characterized by canyons and irregularities causes a non homogeneous behaviour of the illumination in the subsurface and a complex 3D raypath for surface and internal multiples. Complex deep geology, a steeply dipping thrust with 2 culminations, represents...
Proceedings Papers

Paper presented at the 1983 SEG Annual Meeting, September 11–15, 1983
Paper Number: SEG-1983-0351
... but grossly overcorrects the deeper primary events. Hence the supercritical reflection and its multiples stand out as horizontal events. Note that the first order long path multiple comes in at twice the time of the primary and begins to show up at twice the offset, just as one would predict for a...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13873107
... time, as they are for the short path multiples, a selective , varying rapidly from low to high, may be warranted; when the primaries are distant, a large with a low probability of generating artifacts is likely sufficient. source/ receiver plane thin bed multiple raypath multiple raypath - proximal...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3214063
... ABSTRACT In the deep-water Campeche Bay area of the southern Gulf of Mexico, there are many complex shallow salt bodies and carbonate rafts that generate a significant amount of noise energies, collectively for all non-primary reflection energies, as a result of the high impedance contrast...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-2205
... slant-stack is migrated, the image will be similar to a standard Kirchhoff or wave-equation (WE) migration, although because beams in a ray-based beam migration move apart according to the underlying raypaths in poor illumination zones, beam migration has a natural mechanism for suppressing common...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-374
... source is the same for each shot. It is believed that significant changes in the source parameter characteristics of development blasts can be attributable to the medium or raypath attenuation effects. The primary/secondary mining method deliberately creates pillars (secondary stopes) between the...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 3–6, 2004
Paper Number: OTC-16942-MS
... studies have been published that describe and compare various schemes of adaptive subtraction.5, 6, 7 Most of these concentrate on only one aspect of adaptive subtraction the need to remove the multiples without harming the primary reflections. However, in the search for a better adaptive subtraction...
Proceedings Papers

Paper presented at the International Petroleum Technology Conference, November 15–17, 2011
Paper Number: IPTC-15350-MS
... transmission of seismic energy and residual multiples in the processed reflection data. Introduction Drilling operations for hydrocarbon exploration and development in overpressured formations are potentially hazardous from an HSE perspective and can often lead to difficulties such as kicks, blow-outs...
Proceedings Papers

Paper presented at the 2003 SEG Annual Meeting, October 26–31, 2003
Paper Number: SEG-2003-1612
... signal caused by focusing effects of the heterogeneities. The scattering attenuation is then computed using, oAA )(1 SQ A A o ln (1 S Hzf 0= Hz100= L a QS 2 )( )( )( 1 . We calculate for the receivers at different distances from the source the spectral ratios, and plot them as a...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 5–7, 1974
Paper Number: OTC-2001-MS
... average veloc- ity as well as arrival time. Since the aver- age velocity for events which travel different kinds of raypaths is probably different. the attenuation attributable to divergence dif- fers. Thus a multiple will generally have traveled slower than a primary which has the same arrival time and...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-16928321
... demands, seismic data used for reservoir characterization need to be conditioned to remove as many undesirable effects as possible. Three wave-transmission effects that are commonly removed or reduced in pre-inversion gather conditioning are random noise, NMO wavelet stretch, and non-flat reflections...

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