The agency said in a release Tuesday that the Wolfcamp Shale geologic formation in the Midland area contains an estimated 20 billion barrels of oil. It’s also estimated to hold 16 trillion cubic feet of natural gas and 1.6 billion barrels of natural gas liquids.

Officials say the discovery is nearly three times larger than the recoverable oil found in 2013 in the Bakken and Three Forks formations in the Dakotas and Montana.

More advanced drilling, such as hydraulic fracturing, would be needed to reach the oil.

The shale is within the Permian Basin, one of the most productive regions for oil and gas in the U.S.

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