A geographical area with substantial deposits of crude oil, natural gas, or oil sands. In the United States, most deposits are in the states of Alaska, Louisiana, Oklahoma, and Texas. Huge reserves of oil sands are in Canada's province of Alberta.
informal term that applies to a region in the United States that produces a
significant amount of U.S. oil. The oil patch states include Texas, Oklahoma,
Kansas, and Louisiana. Although Alaska is a large oil producer, it is
geographically outside of the oil patch.