As with real estate, there are three problems with seismic: location, location, and location. That is, the three big concerns are location of shots, location of receivers, and location of depth points. This paper deals with the first problem, location of shots when they have to be moved while shooting a 3-D survey.

Note the “when” is not “if.” The only thing constant about 3-D surveys from design to field is change. Changes in shot locations are necessary due to a variety of factors, including inaccessible terrain, houses and buildings or other structures, roads and pipelines, wells, crops, or no-permit...

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