Quantitative method for evaluating velocity model quality

Details Quantitative method for evaluating velocity model quality Quantitative method for evaluating velocity model quality

1991-01-17

1991-09-17

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

G01V 136

Patent

active

050501313

ABSTRACT:
A method for quantitatively determining an accurate subsurface velocity prior to data migration includes steps whereby the accuracy of the velocity can be defined by measuring the deviation in depth as a function of offset in the common reflection point (CRP) gather. A point on reflector is selected and the CRP gather is formed. If the image is not flat, the velocity is adjusted until it is flat. The velocity is decreased and the far offset end of the image will be imaged to shallower depth than the near offset end. The velocity is increased and the image will tilt down at the far offset end. An error is defined which is the theoretical accuracy limit for the determination of velocity using the CRP method. A factor is defined that indicates the reliability of the image for a reflector.

REFERENCES:
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patent: 4736347 (1988-04-01), Goldberg et al.
patent: 4802146 (1989-01-01), Moeckel
patent: 4813027 (1989-03-01), Tieman
patent: 4953140 (1990-08-01), Dablain
patent: 4982382 (1991-01-01), Dablain

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