Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1997-03-21
1999-11-02
Shah, Kamini
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367 52, 367 38, 367 50, 367 47, 367 51, 364421, G01V 136
Patent
active
059783141
ABSTRACT:
A method for determining a substantially optimal NMO velocity function for use in stacking a CMP gather of seismic data traces. The method begins with an initial estimate of the NMO velocity function for the CMP gather. This initial estimate is typically determined through conventional seismic velocity analysis. The method then picks a first velocity-traveltime pair falling on the initial estimate of the NMO velocity function and conducts a two-dimensional interpolative search of trial velocity-traveltime pairs in the neighborhood of the pick to find a substantially optimal velocity-traveltime pair. This substantially optimal velocity-traveltime pair is the trial velocity-traveltime pair having the highest stack response and is substituted for the pick in the NMO velocity function. The method then proceeds to find substantially optimal velocity-traveltime pairs to replace each of the other picks on the initial estimate of the NMO velocity function. Preferably, the two-dimensional interpolative search consists of a one-dimensional parabolic interpolative search to identify the optimal velocity for each computational time within a specified time window, followed by a one-dimensional search to select one of these optimal velocities which, together with its corresponding computational time, becomes the substantially optimal velocity-traveltime pair for the pick in question.
REFERENCES:
patent: 4995007 (1991-02-01), Corcoran et al.
Ozdogan Yilmaz (seismic data processing) pp. 166-180.
William H.Press et al (numerical Recipes in fortran) 1986-1992, pp. 395-399 .
Exxon Production Research Company
Jolly Anthony
Shah Kamini
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