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Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427709
... sensitivity kernel chemingui ramos-martinez exploration geophysicist 10 valenciano gradient jaime ramos-martinez FWI using reflections for deep velocity model updates Yang Yang*, Jaime Ramos-Martinez, Normal Daniel Whitmore, Alejandro A. Valenciano, Guanghui Huang, and Nizar Chemingui, PGS Summary...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3419351
... definition orphan basin example tiago alcantara seg international exposition least-square imaging offshore canada exploration geophysicist 10 inversion valenciano data-domain lsm velocity model offshore canada reflectivity High-resolution velocity model building and least-squares imaging...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3214351
... characterization inversion least-square migration santos basin lsm valenciano imaging presalt section annual meeting case study presalt reservoir sequence resolution upstream oil & gas Guitton , A. , 2004 , Amplitude and kinematic corrections of migrated images for nonunitary...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216342
... & gas annual meeting geophysics amplitude migration reflectivity hessian matrix reservoir characterization valenciano operator least-square migration illumination angle gather sigsbee model migrated image Bleistein , N. , 1987 , On the imaging of reflectors in the earth...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2998433
... and field data examples. Presentation Date: Wednesday, October 17, 2018 Start Time: 8:30:00 AM Location: 207C (Anaheim Convention Center) Presentation Type: Oral full waveform inversion inverted model initial model valenciano velocity gradient velocity model upstream oil & gas...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2996390
... Guitton , A. , A. Valenciano , D. Bevc , and J. Claerbout , 2007 , Smoothing imaging condition for shot-profile migration : Geophysics , 72 , no . 3 , S149 – S154 , 10.1190/1.2712113 . Poole , T. L. , A. Curtis , J. O. Robertsson...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13956001
... primary imaging condition ii claerbout valenciano upstream oil & gas migration weglein imaging condition ii annual meeting geophysics seg seg international exposition Araujo , F. V. , A. B. Weglein , P. M. Carvalho , and R. H. Stolt , 1994 , Inverse...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5911398
... on extrapolators applied in the frequency domain, such as those that solve the one-way wave-equation seem to be more suitable to account for such effects ( e.g. , Valenciano et al. , 2011). In this case, attenuation is simulated by turning the phase velocity into a complex quantity. During the implementation...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5869968
...-surface reflection valenciano amplitude upstream oil & gas Complete wavefield imaging for lithology and fluid prediction in the Barents Sea Grunde Rønholt*, Øystein Korsmo, Sören Naumann, Stepan Marinets, PGS, Even Brenne, Muhammad Faheem Abbasi, Statoil Summary: In the shallow water environment...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5915894
... propagator than using RTM and migrating only to stack or to conventional angle gathers. Extension of implicit finite difference (IFD) one-way propagators (Claerbout, 1985) to TTI media has been proposed by Shan (2007) & Valenciano et. al. (2009). The authors also propose a Fourier finite-difference (FFD...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-1145
... 2014 wavefield imaging illumination source wavefield imaging condition rtm algorithm wem valenciano migration depth migrated image reservoir characterization upstream oil & gas Imaging complex structures with separated Up- and Down-going wavefields Alejandro A. Valenciano*, Sean...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-0852
... wavefield artificial intelligence annual international meeting illumination reservoir characterization valenciano surface-related multiple angular illumination finely field data example seg denver 2014 angle domain down-going wavefield subsurface upstream oil & gas angle gather whitmore...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-0461
... artificial intelligence updip wavefield subsurface illumination annual international meeting upstream oil & gas field data example migration geometry antiparallel sea surface acquisition reservoir characterization valenciano imaging acquisition footprint Challenges and Opportunities...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-1052
... and Fourier split-step operators for TTI media. TTI implicit finite difference migration was proposed by Shan (2007) for 2-D media and then extended to higher order operators by Valenciano et al (2009b). Valenciano et al (2009a) developed 3-D Fourier finite difference (FFD) method for TTI media. Hua et al...
Proceedings Papers

Paper presented at the 2012 SEG Annual Meeting, November 4–9, 2012
Paper Number: SEG-2012-1112
... migration field data north sea reservoir characterization valenciano Viscoacoustic imaging: tomographic Q estimation and migration compensation A. A. Valenciano, and N. Chemingui, (PGS) Summary We introduce a tomographic approach to derive 3D interval Q models of the subsurface. The proposed...
Proceedings Papers

Paper presented at the 2010 SEG Annual Meeting, October 17–22, 2010
Paper Number: SEG-2010-3288
... al, 2006); 2. Downward extrapolation imaging based on one-way wave equation (Shan, 2005, 2007; Bale et al, 2007; Valenciano et al., 2009a, 2009b); and 3. Reverse time migration (RTM) by directly solving two-way wave equation (Du et al, 2007; Zhang et al, 2008; Fletcher et al, 2008, 2009). On one hand...
Proceedings Papers

Paper presented at the 2010 SEG Annual Meeting, October 17–22, 2010
Paper Number: SEG-2010-3187
... imaging deconvolution imaging condition reflection receiver field wavefield seg seg denver 2010 amundsen valenciano walter sollner reservoir characterization extrapolation equation 2 imaging condition Imaging of primaries and multiples using a dual-sensor towed streamer N. D. Whitmore*, A.A...
Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-3825
... university reservoir characterization time-lapse seismic data valenciano operator geophysics Joint target-oriented wave-equation inversion of multiple time-lapse seismic data sets Gboyega Ayeni and Biondo Biondi, Stanford University SUMMARY We propose a joint target-oriented wave-equation inversion...
Proceedings Papers

Paper presented at the 2008 SEG Annual Meeting, November 9–14, 2008
Paper Number: SEG-2008-2201
... as an inverse problem based on the minimization of a least-squares functional. The inverse problem can be formulated either in the data space (Lailly, 1983; Tarantola, 1984) or in the model space (Beylkin, 1985; Chavent and Plessix, 1999; Plessix and Mulder, 2004; Valenciano et al., 2006; Yu et al., 2006...
Proceedings Papers

Paper presented at the 2006 SEG Annual Meeting, October 1–6, 2006
Paper Number: SEG-2006-2519
... of dividing by the wavefield, we can divide by a smoothed version of it. Smoothing is robust and easy to parameterize. It also corrects illumination problems in the migrated images. equation geophysics robust imaging condition claerbout valenciano subsalt reflection migration result shot profile...

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