Shale gas reserves in the U.S. 2022, by basin
The Appalachian Marcellus basin has the greatest proved reserves of any shale play in the United States. As of 2022, proved natural gas reserves in that area amounted to 153 trillion cubic feet, nearly twice the size of the second-largest shale play in the Permian Basin. Marcellus is responsible for 10 trillion cubic feet in shale gas production per year.