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The bottom line in terms of cost of the survey, is that the standard
dense geometry requires 200 shots/km^{2} (50 shots/km and 4 receiver lines/km).
For this model (100 km^{2}), this means 20000 shots which is extremely high.
The optimum design uses the dense parameters 156 km^{2} (50 shots/km and
3.125 receiver lines/km) only in zone 1, whose area is about 3.5 km^{2};
uses the intermediate design of 148 km^{2} (50 shots/km and 2.95 receiver
lines/km) only in zone 2 whose area is about 7.5 km^{2}*a*; and uses the sparse
geometry of 70 km^{2} (50 shots/km and 1.38 receiver lines/km) in the remaining
89 km^{2}. This gives a total of about 8000 shots, less than half those of the
standard geometry. This saving in the number of shots is obtained without
compromising the image of the target reflector at any depth and without
significantly upsetting the logistics of the acquisition.

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Stanford Exploration Project

7/8/2003