US 7,321,526 B2 | ||
Method and apparatus for water velocity decomposition | ||
Charles V. Carvill, Katy, Tex. (US); and Jonathan G. Fried, Lakewood, Colo. (US) | ||
Assigned to WesternGeco, L.L.C., Houston, Tex. (US) | ||
Filed on May 30, 2003, as Appl. No. 10/448,904. | ||
Prior Publication US 2004/0240319 A1, Dec. 02, 2004 | ||
Int. Cl. G01V 1/38 (2006.01); G01V 1/36 (2006.01) |
U.S. Cl. 367—21 [367/15; 367/50; 367/51] | 22 Claims |
11. A method of analyzing traces collected along a plurality of adjacent sail lines in a marine seismic survey area, comprising:
selecting a plurality of trace groups, at least one trace in each group sharing a common midpoint with at least one trace
from another group;
determining an initial zero-offset travel time for each trace in the trace groups; and
generating a plurality of updated zero-offset travel times and a plurality of time corrections for the trace groups based
on Tn(i, j, k)=To(j)+Δt(k), wherein Tn(i, j, k) represents the initial zero-offset travel times, To(j) represents the urdated zero-offset travel times and Δt(k) represents the time corrections; and
using Tn(i, j, k)=To(j)+Δt(k) to form a least-squares error function
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