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Keywords: horizontal velocity
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Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3211288
... king abdullah university efficient wavefield inversion reservoir characterization inversion optimization problem velocity model acoustic vti media upstream oil & gas horizontal velocity equation Alkhalifah , T. , 2016 , Research note: Insights into the data dependency...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17740527
... underestimated. Analysis of simple reflection coef- ficient solutions based on linearized approximations helps to explain why the inversion obtains the horizontal velocity of the shale. Though the linearized results are only applicable for lower values of kerogen volume fraction, the nonlinear in- version based...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17587478
... parameterized perturbation approximation defined by vertical and horizontal velocities and three cross-term anellipticity parameters results in the best accuracy comparing with the perturbation approximation using other parameterizations. Introduction The traveltime approximations are commonly used in seismic...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13867221
... variables are the horizontal velocity , = and the perturbation. Application to the anisotropic version of Marmousi model with a single frequency of 2.5 Hz shows that this method can converge to the accurate result starting from a linearly increasing isotropic initial velocity. Application to a real...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13863627
... Date: Tuesday, October 18, 2016 Start Time: 1:50:00 PM Location: 166 Presentation Type: ORAL horizontal velocity non-uniqueness problem optimization seg seg international exposition log measurement correction anisotropy log analysis well logging annual meeting vti parameter...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13953250
...) to the long and short wavelength components of the anisotropic parameters. Considering the low sensitivity of FWI to the anellipticity parameter when parametrizing the acoustic transversely isotropic model with the horizontal velocity, and , we develop a combined FWI and reflection waveform inversion (RWI...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13611846
... and horizontal velocities. We start with transversely isotropic medium with a vertical symmetry axis (VTI) and extend this approach to orthorhombic (ORT) medium. In order to stabilize the perturbation series, the Shanks transform is applied for the cases. The new moveout approximations result in better accuracy...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5856899
... geophysics upstream oil & gas media annual international meeting gradient horizontal velocity inversion hess vti model reflectivity jmi berkhout cost function Robust anisotropy estimation using joint migration inversion Abdulrahman Alshuhail and D.J. Verschuur, Delft University...
Proceedings Papers

Paper presented at the 2012 SEG Annual Meeting, November 4–9, 2012
Paper Number: SEG-2012-0730
... by the squares of vertical and horizontal velocity results in vertical velocity and e updates with opposite signs. On the other hand, a model space parametrized by the logarithm of the vertical velocity squared and epsilon has more reasonable updates. However, ambiguity does exist in the inversion results...
Proceedings Papers

Paper presented at the 2011 SEG Annual Meeting, September 18–23, 2011
Paper Number: SEG-2011-2799
... of the Hessian from Bayesian estimation theory and synthetic examples. Our analysis shows that, in the context of macromodel building, namely background estimation, acoustic VTI FWI mainly depends on the normal moveout (NMO) velocity and the horizontal velocity (or equivalently a combination of these two...
Proceedings Papers

Paper presented at the 2011 SEG Annual Meeting, September 18–23, 2011
Paper Number: SEG-2011-2543
... ABSTRACT Anisotropy can have a significant footprint in seismic imaging from surface wide-aperture data, because of the difference between vertical and horizontal velocities in vertical transversely isotropic (VTI) media. A key issue in anisotropic full waveform inversion (FWI) is to define...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-0134
... anisotropy. Parameterizing the medium ellipticity by the ratio between the squares of the vertical and horizontal velocities, they showed that time remigration in elliptically anisotropic media is described by the isotropic image wave equation using the horizontal velocity. This agrees with the fact...
Proceedings Papers

Paper presented at the 2006 SEG Annual Meeting, October 1–6, 2006
Paper Number: SEG-2006-3413
... sensitivity analysis stereotomography diffractor approximation media anelliptic media inversion horizontal velocity ray coverage vertical velocity relative error initial condition geophysics upstream oil & gas anisotropic media Sensitivity Analysis for Stereotomography in Elliptic...
Proceedings Papers

Paper presented at the 2004 SEG Annual Meeting, October 10–15, 2004
Paper Number: SEG-2004-0119
... in weak anisotropy media shows that each traveltime approximation has its own requirements for spread length and subsurface anisotropic parameters. The accuracy of the estimated Thomsen's anisotropic parameter d (or e) depends not only on the accuracy of the picked NMO velocity (or horizontal velocity...
Proceedings Papers

Paper presented at the 2004 SEG Annual Meeting, October 10–15, 2004
Paper Number: SEG-2004-0159
... the vertical velocity to be higher than the horizontal velocity that is uncommon in the conventional sand-shale formations. Since HR is characterized by high velocity hydrate veins, emulating vertical layering, an HTI model (TI with a horizontal axis of symmetry) seems more appropriate. Our anisotropy analysis...
Proceedings Papers

Paper presented at the 2003 SEG Annual Meeting, October 26–31, 2003
Paper Number: SEG-2003-0753
... isotropic with a vertical symmetry axis (VTI) media. Near offsets are used to estimate the vertical travel time and normal moveout (NMO) velocity, while the non-hyperbolic moveout of all offsets are fitted to estimate the horizontal velocity. _ and d parameters are estimated from these velocities...
Proceedings Papers

Paper presented at the 2002 SEG Annual Meeting, October 6–11, 2002
Paper Number: SEG-2002-0129
... as a vertically transversely isotropic (VTI) medium. For such a medium, waves travel vertically and horizontally with different velocities, e.g., Vo (vertical velocity) and Vh (horizontal velocity). It is well known that the velocities from normal moveout (NMO) analysis are usually higher than those from wells...
Proceedings Papers

Paper presented at the 2002 SEG Annual Meeting, October 6–11, 2002
Paper Number: SEG-2002-1979
.... lawrence livermore geophysics original marmousi model upstream oil & gas hydrocarbon seg int algorithm reservoir characterization exploration geophysics dataset modeling avo analysis marmousi model horizontal velocity p-wave velocity calibration salt lake city exposition national...
Proceedings Papers

Paper presented at the 2000 SEG Annual Meeting, August 6–11, 2000
Paper Number: SEG-2000-0586
... can be affected by as much as 5 percent from horizontal velocities. Dipole sonic logs indicate that at greater angles, encountered both by surface and crosswell reflection profiling, velocities may be 20-30 percent less than bedding-plane velocities. anisotropic tomography reservoir...
Proceedings Papers

Paper presented at the 2000 SEG Annual Meeting, August 6–11, 2000
Paper Number: SEG-2000-2253
... SUMMARY A linearized eikonal equation is developed for transversely isotropic (TI) media with vertical symmetry axis (VTI). It is linear with respect to perturbations in the horizontal velocity or the anisotropy parameter h. An iterative linearization of the eikonal equation is used...

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