ALBANY -- A geologist says the Marcellus shale region of the Appalachians could yield seven times as much natural gas as he earlier estimated, meaning it could meet the entire nation's natural gas needs for at least 14 years.

Penn State University geoscientist Terry Engelder said in a phone interview Monday that he now estimates 363 trillion cubic feet of natural gas could be recovered over the next few decades from the 31-million-acre core area of the Marcellus region, which includes southern New York, Pennsylvania, West Virginia and eastern Ohio.

Engelder and geologist Gary Lash of the State University of New York at Fredonia touched off a gas rush in the region last January with their study estimating that the Marcellus could yield as much as 50 trillion cubic feet of natural gas.

Geologists have long known about the existence of the Marcellus shale, but exploration there accelerated only recently when the price of natural gas rose high enough to make it economically feasible to use the advanced drilling techniques necessary to produce gas from the hard rock thousands of feet underground.

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