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7th International Congress of the Brazilian Geophysical Society
- Conference date: 28 Oct 2001 - 31 Oct 2001
- Location: Salvador, Bahia, Brazil
- Published: 28 October 2001
461 - 465 of 465 results
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Avo Analysis Based On Purely Kinematic Imaging
Authors Dominique Rousset, Hervé Perroud and Martin TygelIf we assume that the kinematic imaging problem is solved, we get valuable macrovelocity model and depth description of the interfaces.
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Common-Reflection-Surface Stack And Attributes
Authors Steffen Bergler, Yongahi Zhang, Pedro Chira, Kai-Uwe Vieth and Peter HubralThe common-Reflections-Surface Stack which has been established over the past years as an alternative to standard data-driven imaging techniques not only yields high-quality stack sections from multi-coverage reflection pre-stack dat but also provides as by product to the stacked section important wavefield attributes.
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The Role Of Interface Waves And Diffracted Waves In The Amplitude Scattering Phenomenon
Authors Nathalie Favretto-Cristini and Eric de BazelaireAmplitude scattering, caused by the
occurrence of thin gaps between layers, is a fractal
phenomenon that may generate visible events on
seismic sections, correlated from trace to trace but
different from usual reflections, although of
equivalent energy. The occurrence of these events,
wrongly assumed as reflections, may lead to
erroneous interpretation of real data, in particular
when locating reflectors and inverting the amplitudes
of reflected events. We argue that the near-field wave
propagation in the vicinity of the geological contacts,
and specially interface wave propagation and
diffracted waves, is widely involved in the
occurrence of the amplitude scattering phenomenon.
Theoretical and phenomenological studies,
performed at the present time, appear consistent with
our assumptions.
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Towards Accurate Amplitudes For One-Way Wavefield Extrapolation Of 3-D Common Shot Records
Authors Yu Zhang, James Sun, Samuel H. Gray, Carl Notfors and Norman BleisteinWe analyzed the amplitudes produced by shot-record migration by one-way wavefield extrapolation. By comparing these amplitudes with those produced by true amplitude Kirchhoff migration, we show the amplitude and phase errors that come from a standard implementation of migration by one-way wavefield extrapolation.
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Velocity Analysis In The Scattering-Angle/Azimuth Domain
Authors Sverre Brandsber, Bjorn Ursin and Maarten V. de HoopWe present a method for migration velocity analysis in complex media that does not depend on picking traveltime misfits or residual moveout in common image gathers (CIGs).
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