Knowledge gained from geological and technical advances has prompted the U.S. Geological Survey (USGS) to up its estimates of undiscovered technically recoverable natural gas resources for the Appalachian Basin’s Marcellus and Point Pleasant-Utica shale formations by about 75% to a combined 214 trillion cubic feet (Tcf).

The assessment, released last week by the USGS, represents a significant jump from estimates delivered in 2011 for the Marcellus and 2012 for the Utica. Back then, the USGS put Marcellus Shale’s estimate at a mean of 84 Tcf and the Utica Shale at 38 Tcf.

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