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The University of Texas at Austin Bureau of Economic Geology has released a study that says the Fayetteville Shale holds economically recoverable reserves totaling 18 trillion cubic feet.

This is enough for recovery through 2050 at current rates of production.

The study, funded by the Alfred P. Sloan Foundation, analyzed the basin’s production history from existing wells and reviewed areas that have not yet been drilled.

The study found the Fayetteville Shale holds 38 trillion cubic feet of recoverable gas reserves in total. However 20 trillion cubic feet do not appear to be economically viable.

“The higher productivity tiers are, not surprisingly, more developed,” said co-principal investigator Svetlana Ikonnikova, an energy economist, “The lower tiers remain uneconomic at almost any foreseeable gas price.”