Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1989-08-21
1990-08-28
Lorbo, Ian J.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
364421, G01V 128
Patent
active
049531409
ABSTRACT:
An improved method for modeling the subterranean structure of the earth is disclosed. Assumed velocities are used in initially modeling the path of seismic energy through the subterranean structure. Arrays of travel times corresponding to upward and downward going energy from various locations in the subterranean structure are calculated using ray tracing techniques. Actual reflection points are located when the sum of the upward and downward going travel times calculated with respect to a particular point in the structure equals the actual travel times recorded. The velocity assumptions are verified by selecting common reflection point records and adjusting the assumed velocities, such that reflection events on displayed traces from the common reflection point are horizontal. A least squares fit is used to correct the common reflection point event data until it is optimally flat.
REFERENCES:
patent: 4415999 (1983-11-01), Moeckel et al.
patent: 4464737 (1984-08-01), Pann
patent: 4479205 (1984-10-01), Grey
patent: 4839869 (1989-06-01), Corcorca
"Depth Migration of Complex Offshore Seismic Profiles," Larner et al., Offshore Technology Conference, 1978, Texas.
"Velocity Analysis Using Prestack Migration", K. Al-Yahya and Francis Muir, SEP-38 (Standford Exploration Project, vol. 38), pp. 105-112 (1984).
"Velocity Analysis Using Prestack Migration: Applications", Al-Yahya & Muir, SEP-41, pp. 121-147.
"Velocity Analysis By Iterative Profile Migration", Al-Yahya, SEP-53, pp. 1-76 (1987).
Hager Jr. George W.
Lorbo Ian J.
McKillop Alexander J.
Mobil Oil Corporation
Speciale Charles J.
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