Analysis of tip and edge diffractions in dip-angle gathers for orthorhombic media
- Yogesh Arora (CPC Corporation, Taiwan) | Ilya Tsvankin (CPC Corporation, Taiwan)
- Document ID
- Society of Exploration Geophysicists
- 2018 SEG International Exposition and Annual Meeting, 14-19 October, Anaheim, California, USA
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Exploration Geophysicists
- 3D, Acoustic, Diffraction, Kirchhoff, Anisotropy
- 0 in the last 30 days
- 9 since 2007
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Seismic diffractions, which are produced by heterogeneities smaller than seismic wavelength, have proved useful in a number of 2D and 3D applications. Among the challenges hampering the use of diffractions in seismic data processing is the sensitivity of diffraction separation after prestack migration to velocity errors. Therefore, it is essential to properly account for velocity anisotropy in diffraction separation and imaging. Here, we analyze the signature of diffractions in orthorhombic models, which are typical for many subsurface formations. Tip and edge diffraction events are modeled for a tetrahedron embedded in an orthorhombic medium. We construct 3D dipangle common-image gathers (CIGs) as a function of azimuth and migration dip using both the actual orthorhombic velocity field and a purely isotropic velocity model. The modeling results provide insight into the influence of velocity errors on the diffraction moveout in different azimuths in the dip-angle domain. This work should aid in constructing diffraction-based depth images using 3D anisotropic velocity models.
Presentation Date: Tuesday, October 16, 2018
Start Time: 1:50:00 PM
Location: Poster Station 18
Presentation Type: Poster
|File Size||1 MB||Number of Pages||5|
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