3-dimensional migration of irregular grids of 2-dimensional seis

Details 3-dimensional migration of irregular grids of 2-dimensional seis 3-dimensional migration of irregular grids of 2-dimensional seis

1990-02-20

1992-01-07

MacDonald, Allen R.

Boots, shoes, and leggings

364422, 367 51, 367 53, 367 72, 395127, G01V 100, G06F 1500

Patent

active

050797034

ABSTRACT:
A method and apparatus for deriving a three-dimensional seismic image from an irregular grid of two-dimensional seismic data is provided. The two-dimensional seismic data incldue a plurality of shot lines. For each of the shot lines, a two-dimensional migration is performed therealong (22) to create a plurality of migrated shot lines. For each of a plurality of three-dimensional image points, the following substeps are performed. A migrated trace (X) is selected from each of the migrated shot lines that is closest to the image point (I). A further migration (30) is performed on each selected migrated trace (28) with respect to the image point (I). A three-dimensional migrated image (30) comprising the image points is thereby obtained. The invention allows the use of historical, irregular two-dimensional grids of seismic data to be efficiently used for the three-dimensional imaging of subsurface features.

REFERENCES:
patent: 4363113 (1982-12-01), Taner et al.
patent: 4745585 (1988-05-01), Larner
patent: 4888742 (1989-12-01), Beasley
patent: 4964103 (1990-10-01), Johnson
Yilmaz, Seismic Data Processing (Society of Exploration Geophysicists, 1987), pp. 252-261, 402-407.
McQuillin, et al., An Introduction to Seismic Interpretation (Gulf Publishing Co., Houston, 1984), pp. 92-97.

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