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Surface-to-surface refraction lines define the top of a shallow domal mass previously located by reflection methods. A normal line off the flank is needed for comparison. If salt is identified, a map is made from the results of a number of refraction lines radiating from the center of the dome. The increased accuracy of this system is primarily dependent upon the accurate determination of velocities and distances.

Flank wells are used for further refraction shooting which yield more accurate velocity information and more detailed profiles of the domal mass. A map from this integrated information permits exploitation at a minimum risk, even though every location is essentially a wildcat.

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