Evaporites are minerals produced by the evaporation of water. This may occur in marine or nonmarine settings. The common evaporite minerals associated with petroleum exploration are halite, gypsum, and anhydrite.
Gypsum formation of Capo Bianco, at the mouth of the river Platani, Sicily. Courtesy Wikimedia Commons, Creative Commons Attribution-Share Alike 3.0 Unported license.
Anhydrite from Chihuahua, Mexico. Courtesy Wikipedia.