Petroleum is the foremost community in the remains of Midland, Texas. It is so named for the Petroleum Building, a Pre-War structure that has mostly been restored by the town's preeminent family, surname Salt. It is a member community of the Midessa Compact. It is defended by the Roughnecks, a private militia employed by the Salt Family. It has a population of roughly 2,500 adults in 2281.