Evaporite deposits of the Devonian Prairie Formation in the Williston basin have undergone episodic dissolution, creating many types of hydrocarbon traps. Removal of the salt has resulted in collapse breccias, drape structures, local thickening of potential reservoir rock by sink infill, and enhanced migration paths. Recognition of the presence and absence of the salt section assists an interpreter in avoiding the pitfall, of salt-related velocity phenomena. Keys to recognizing salt solution on seismic data include abrupt terminations of salt reflectors, rootless structures, and isochron thickening and thinning. Comparisons of sets of isochron maps, to identify areas of superimposed thicks and thins, help determine the timing of solution.

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