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Perturbation-based moveout approximations in anisotropic media.
- Source :
- Geophysical Prospecting; Sep2017, Vol. 65 Issue 5, p1218-1230, 13p
- Publication Year :
- 2017
-
Abstract
- ABSTRACT The moveout approximations play an important role in seismic data processing. The standard hyperbolic moveout approximation is based on an elliptical background model with two velocities: vertical and normal moveout. We propose a new set of moveout approximations based on a perturbation series in terms of anellipticity parameters using the alternative elliptical background model defined by vertical and horizontal velocities. We start with a transversely isotropic medium with a vertical symmetry axis. Then, we extend this approach to a homogeneous orthorhombic medium. To define the perturbation coefficients for a new background, we solve the eikonal equation with horizontal velocities in transversely isotropic medium with a vertical symmetry axis and orthorhombic media. To stabilise the perturbation series and improve the accuracy, the Shanks transform is applied for all the cases. We select different parameterisations for both velocities and anellipticity parameters for an orthorhombic model. From the comparison in traveltime error, the new moveout approximations result in better accuracy comparing with the standard perturbation-based methods and other approximations. [ABSTRACT FROM AUTHOR]
- Subjects :
- PERTURBATION theory
ANISOTROPY
SEISMOLOGY
APPROXIMATION theory
CRYSTALLOGRAPHY
Subjects
Details
- Language :
- English
- ISSN :
- 00168025
- Volume :
- 65
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Geophysical Prospecting
- Publication Type :
- Academic Journal
- Accession number :
- 124794315
- Full Text :
- https://doi.org/10.1111/1365-2478.12480