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Reverberations and multiples

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Proceedings Papers

Paper presented at the 1983 SEG Annual Meeting, September 11–15, 1983
Paper Number: SEG-1983-0264
... Meeting, Calgary. Wave Field Extrapolation Techniques for Prestack Attenuation of Water Reverberations S2.7 Henrik Bernth and Lars Sonneland, Geco, Norway Hard seafloor multiple reflections, which are often found in seismic data recorded at polar latitudes, sometimes prove difficult to eliminate...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17795124
... ABSTRACT In some geological settings, internal multiples are a common problem at target levels in seismic data. In the Norwegian Continental Shelf, there is a relatively simple overburden in terms of structural complexity, where the propagating waves tend to reverberate and generate strong...
Proceedings Papers

Paper presented at the 2001 SEG Annual Meeting, September 9–14, 2001
Paper Number: SEG-2001-1309
... Summary In ocean-bottom seismic (OBS) data, multiples can be catalogued into pure water-column reverberations, receiverside multiples, and source-side multiples. The multiples belonging to pure water-column reverberations and receiver-side reflections at the free surface are contained in the...
Proceedings Papers

Paper presented at the 7th World Petroleum Congress, April 2–9, 1967
Paper Number: WPC-12175
... (Cretaceous and Jurassic) is the prolific producer. It thus became increasingly critical to distinguish the variations in structural trends between the Tertiary horizons and those below the regional Upper Cretace- ous unconformity. In effect, methods to overcome the near-surface reverberations and multiple...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5856770
... Summary Shallow water environments are dominated by short period reverberation contamination. Surface-related multiple elimination (SRME) can be successfully applied but distortion at the multiple prediction stage must be minimized so that the adaptive subtraction (multiple elimination) step...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216718
... the other orders of reverberations that could act as potential pseudo-source (with application of reciprocity). To avoid migration artefacts due to inadequate data, strategies that can extract most information out of the available data are required. Surface-related multiples travel along different...
Proceedings Papers

Paper presented at the 2004 SEG Annual Meeting, October 10–15, 2004
Paper Number: SEG-2004-1297
... exposition wyœns wssy ABSTRACT The attenuation of unwanted multiple energy in seismic data is a prerequisite for subsequent seismic imaging and amplitude analysis. Removal of multiples related to water column reverberations have gained much attenuation the last decades and numerous methods for...
Proceedings Papers

Paper presented at the 2002 SEG Annual Meeting, October 6–11, 2002
Paper Number: SEG-2002-2118
... within the water layer describe the long-period reverberations and relate primary and multiple events occurring in the beam components of the wavefield. With these relations, the beam-component time series can be shifted according to ray-path traveltimes and then analyzed with a multi-channel prediction...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2998168
... multiples gen- erated from shallow layers can be seen as low-frequency down- ward curved reverberations in the least-squares migration case (Figure 5c) that imprint the primaries. This reverberation seems to continue throughout the whole section. At the same time, angle-gathers estimated via JMI (Figure 5b...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2998444
.... Separation and ultimately attenuating multiples without compromising signal is the ultimate goal in achieving a reliable datasets. In advanced seismic processing, seismic multiples are used to image sub salt bodies, by using there multiple reverberating imprints as a pattern for imaging. Nevertheless...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17739249
... de-multiple techniques. A 3D SRME approach was developed to address surface- related (long period) multiples together with their associated (short period) reverberations in a surface- consistent manner, which has been discussed by J.W. de Maag (2014). It was concluded that 3D SRME has suppressed a...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17724656
...-side peg-leg multiples as well, we need to add an- other term, PFT . By including both terms (FP and PFT ) , the water-layer multiples and the symmetric reverberations are predicted twice. This requires correction using a third term (FPFT ). Therefore, the full multiple model including all peg- leg...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17779722
... internal reverberations. Figure 4 shows there are still issues with internal multiples after the parabolic radon. The second task was to identify the internal multiples presence and their effect at reservoir level. The internal multiples were predicted using a data-driven algorithm based on the Inverse...
Proceedings Papers

Paper presented at the Offshore Technology Conference, April 28–May 1, 1973
Paper Number: OTC-1846-MS
... optimum frequency wavelength application fluctuation relative receiver power dropout distribution function particle diameter scatterer upstream oil & gas temperature fluctuation reverberation frequency receiver power detector acoustic wavelength compressibility cross...
Proceedings Papers

Paper presented at the Abu Dhabi International Petroleum Exhibition and Conference, November 9–12, 2015
Paper Number: SPE-177428-MS
... Figure 5 for example, we can see a significant reduction in reverberation throughout the section on both intercept and gradient volumes. Figure 5 Intercept and Gradient volumes (with VSP corridor stack overlain) before and after interbed multiple attenuation Furthermore, it was interesting...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-1074
... Summary Reverse time migration of multiples (RTMM) is applied to OBS data with sparse receiver spacing. RTMM for OBS data unlike a marine streamer acquisition is implemented in the common receiver gathers (CRG) and provides a wider and denser illumination for each CRG than the conventional...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2992808
... two advantages over domain methods: 1) the ease of handling irregular fracture shapes, and 2) the reduction of the problem dimensions making the computation fast. Moreover, BEMs model the complete wavefield including multiples and reverberations. However, the computation time increases rapidly...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2996329
... imaging has historically focused on imaging primary energy from recordings, where multiple reverberations of the free surface are considered noise and suppressed in prestack processing before depth migration. There is, however, a range of imaging and data processing challenges where standard methods are...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-1221
... the marine seismic coda often has strong imprints of multiples, which are the reverberating energy within the ocean water column due to strong impedance contrast between air, water and sediments. For thin layers, although internal multiples exist, they often appear along with the primary as one...
Proceedings Papers

Paper presented at the 2012 SEG Annual Meeting, November 4–9, 2012
Paper Number: SEG-2012-0864
... SUMMARY We presents a technique for imaging both primaries and multiples using linearized inversion. Linearized full-wave inversion (LFWI) makes use of the multiple energy as signal while removing the crosstalk in the image. We demonstrate the concept and methodology in 2D with a synthetic...

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