Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Earth science
Reexamination Certificate
2005-03-08
2005-03-08
Barlow, John (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Earth science
C702S014000, C367S073000
Reexamination Certificate
active
06865489
ABSTRACT:
A method for performing pre-stack time migration of seismic data in a region where the subsurface seismic wave propagation velocity varies in both the vertical direction and a horizontal direction. The migration is performed in the wave number—frequency domain and involves using travel time maps to find a linear fitting of the migration phase shift for a given ray parameter and at a given vertical depth versus horizontal position. The slope and intercept parameters from the linear fit are used to adjust a known pre-stack time migration equation, with the accuracy of the linear approximation requiring mild horizontal velocity variation.
REFERENCES:
patent: 6446007 (2002-09-01), Finn et al.
patent: 6643590 (2003-11-01), Wiggins
Bevc, et al. (1995) “Plumes: Response of Time Migration to Lateral Velocity Variation”, Geophysicis 60, pp. 1118-1127.
Black and Brzostowski (1994) “Systematics of Time Migration Errors”, Geophysics 59, pp. 1419-1434.
Finn and Winbow, (2002), “3-D Prestack migration of Common-Offset Data in the Frequency-Wavenumber Domain”, 72ndSEG Int'l Mtg and Expo, Extended Abstracts.
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Kim, et al. (1989) “Recursive Wavenumber-Frequency Migration”, Geophysics 54, pp. 319-329.
Schleicher et al., (1993) “3-D True Amplitude Finite-Offset Migration”, Geophysics 58, pp. 1112-1126.
Yilmaz, O. (1994) “Seismic Data Processing”, Society of Exploration Geophysics, p. 269.
Barlow John
ExxonMobil Upstream Research Company
Plummer J. Paul
Walling Meagan S
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