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Keywords: down-going wavefield
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Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the SEG/AAPG International Meeting for Applied Geoscience & Energy, August 27–September 1, 2023
Paper Number: SEG-2023-3910698
... of the wavefield that have traditionally required attenuation prior to imaging such as ghost and multiple energy. The derived reflectivity volume is naturally formed from both up-going and down-going wavefields allowing the benefits of both to be captured in a single output. Here, we demonstrate the application...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the SEG/AAPG International Meeting for Applied Geoscience & Energy, August 28–September 1, 2022
Paper Number: SEG-2022-3747470
.... When the exact velocity model is used, mirror RTM with both up- and down-going wavefields produces the best image with greater illumination. On the other hand, the image obtained from seismic interferometry is less sensitive to velocity errors. vertical seismic profile imaging illumination...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3414684
... introduce a new idea that we call down/down deconvolution. Down/down deconvolution performs a combination of 3D signature deconvolution and free-surface multiple attenuation on the down-going wavefield. As a result, the down-going wavefield can be as effectively deconvolved as the up-going wavefield...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3424895
.... To with de-noised P and Z components mostly, separates up- remove the shear wave leakage from the vertical geophone, and down-going wavefields to eliminate the effect from a de-noise methodology developed by Jeong and Tsingas receiver side multiples, 2) 1D re-datuming provides a fast (2019) using all four...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3215138
..." for internal multiple attenuation (IMA) introduced by van der Neut and Wapenaar (2016), we extend the formulation to be applicable to ocean bottom recordings. We demonstrate the results for up-going and down-going wavefields on a data set from the Santos Basin, offshore Brazil, where internal multiple...
Proceedings Papers
D. Lecerf, A. Oates, R. Brown, E. Polyaeva, F. Portaluri, C. Reiser, D. Raistrick, A. Betteridge, J. Kumar, B. Webb, M. Bertarini, C. Rizzetto, N. Colombi, V. Milluzzo, M. Marchesini, A. Cimitan, I. Franco
Publisher: Society of Exploration Geophysicists
Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3214837
... stacked channels. Presentation Date: Monday, September 16, 2019 Session Start Time: 1:50 PM Presentation Start Time: 2:40 PM Location: 225B Presentation Type: Oral down-going wavefield denoise seg international exposition frequency annual meeting sea surface up-going wavefield data...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2998162
... updates from the up- and down-going wavefields. Presentation Date: Wednesday, October 17, 2018 Start Time: 1:50:00 PM Location: Poster Station 8 Presentation Type: Poster full-waveform inversion down-going wavefield upstream oil & gas artificial intelligence inversion algorithm...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2991159
... the propagation in 3D. In this paper, we introduce a computationally efficient algorithm for wavefield separation that requires storing only one additional snapshot of the wavefields. Applying the optical flow method on the separated down-going wavefield produces improved ADCIGs as verified by tests on both...
Proceedings Papers
A. Alghamdi, H. Mingzhong, S. Aldeghaither, A. Khan, S. Alzahrani, C. Tsingas, Z. Donliang, M. S. Diallo
Publisher: Society of Exploration Geophysicists
Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2995816
... dataset acquired in one of the most challenging environment. Presentation Date: Wednesday, October 17, 2018 Start Time: 8:30:00 AM Location: 204C (Anaheim Convention Center) Presentation Type: Oral receiver wavefield separation down-going wavefield processing challenge annual meeting time...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17791601
... & gas seismic acquisition wavefield berkhout crosstalk resolution narrow node coverage annual international meeting illumination surface multiple down-going wavefield node Berkhout , A. J. , 1982 , Seismic migration: Imaging of acoustic energy by wave field extrapolation...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13779270
.... We applied a similar processing workflow to the up- and down-going wavefields, and observed an uplift in the 3D subsalt images generated using the up-going data. This particular synthetic example shows similar 4D noise values in the extra salt area on both up-and down-going images, but improved...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5849557
... the spectral-ratio method as well as the dominant frequency matching method. From the up-going wavefield, we obtained that Q P values range from 20-28 from 66-250m depth. For the deeper layers, using down-going wavefield, the estimated QP values range from 51-61 from 250-500m depth. In comparison, we used...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5886915
... to suppress these reverberations. However, the only difference between primaries and multiples is that multiples travel along different paths (Dash, 2009). The water layer multiples (down-going wavefield) can be used to improve the image quality and illumination at shallow subsurface. Imaging with the down...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-0852
... can be coarse in conventional marine towed-streamer acquisition. Imaging of multiples can help mitigate the problem, as it employs the down-going wavefield as an areal source. The areal source augments source density when compared with the point source used for imaging of primaries. We apply Separated...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-1011
... that are ideally suited for imaging of broadband data. Leveraging dual sensor streamer technology and the wavefield separation that comes with it, we are using up- and down-going wavefields in imaging and tomography to improve resolution and illumination. Further, we utilize the refracted, low-frequency energy...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-1074
... interval. In the conventional method OBS data are separated into up- going and down-going wavefields before migration (Barr and Sanders, 1989; Osen et al., 1999), and only the up-going wave- field is used to image the subsurface structure, which usually has a limited illumination. In fact, the ocean...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-0322
... reservoir image, especially for subsalt targets, effective demultiple for the down-going wavefield is critical. However, due to the considerable cost of semi-permanent deployments, OBN surveys have sparser receiver sampling than that of streamer surveys. This sparse sampling poses challenges in multiple...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2012 SEG Annual Meeting, November 4–9, 2012
Paper Number: SEG-2012-0038
... in marine seismic VSP data for improved subsurface depth imaging is presented. Traditionally, up-going and down-going wavefields are separated during VSP signal processing and only the up-going wavefield is used to image the subsurface below the receivers. However with using the down-going wavefield...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2012 SEG Annual Meeting, November 4–9, 2012
Paper Number: SEG-2012-0253
... conventional datasets. The dual-sensor data was acquired with the streamer at 25m whilst the existing data had conventional depths of 4m and 6m. Wavefield separation into up-going and down-going wavefields is a prerequisite in order to reconstruct the total pressure field at a different depth. Proper wavefield...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2012 SEG Annual Meeting, November 4–9, 2012
Paper Number: SEG-2012-1531
... SUMMARY Using only surface reflection data and first-arrival information, we generate up- and down-going wavefields at every image point using the algorithm of Rose (2002b,a) and Wapenaar et al . (2011, 2012a). An imaging condition is applied to these up- and down-going wavefields directly...
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