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Depth migration in transversely isotropic media with explicit operators [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1994.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
140 pages : digital, PDF file
Additional Creators
Colorado School of Mines, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The author presents and analyzes three approaches to calculating explicit two-dimensional (2D) depth-extrapolation filters for all propagation modes (P, SV, and SH) in transversely isotropic media with vertical and tilted axis of symmetry. These extrapolation filters are used to do 2D poststack depth migration, and also, just as for isotropic media, these 2D filters are used in the McClellan transformation to do poststack 3D depth migration. Furthermore, the same explicit filters can also be used to do depth-extrapolation of prestack data. The explicit filters are derived by generalizations of three different approaches: the modified Taylor series, least-squares, and minimax methods initially developed for isotropic media. The examples here show that the least-squares and minimax methods produce filters with accurate extrapolation (measured in the ability to position steep reflectors) for a wider range of propagation angles than that obtained using the modified Taylor series method. However, for low propagation angles, the modified Taylor series method has smaller amplitude and phase errors than those produced by the least-squares and minimax methods. These results suggest that to get accurate amplitude estimation, modified Taylor series filters would be somewhat preferred in areas with low dips. In areas with larger dips, the least-squares and minimax methods would give a distinctly better delineation of the subsurface structures.
Report Numbers
E 1.99:doe/er/14079--37
E 1.99: cwp--163
cwp--163
doe/er/14079--37
Subject(s)
Other Subject(s)
Dissertation Note
Thesis (Ph.D.); PBD: Dec 1994
Note
Published through SciTech Connect.
12/01/1994.
"doe/er/14079--37"
" cwp--163"
"DE95007670"
"KC0403010"
Uzcategui, O.
Type of Report and Period Covered Note
Topical; 12/01/1994 - 12/01/1994
Funding Information
FG02-89ER14079
View MARC record | catkey: 14380707