"This is spectacular, relative to what we thought a few years ago," Engelder said of the roughly 4,000 wells in Pennsylvania that are producing.
The EIA also looked at the decline rate of the Marcellus wells, since most of the gas is produced during their first two years.
"It's interesting that it's not falling as steeply" as other shale fields such as the Bakken in North Dakota or Eagle Ford in Texas, Gorgen said.
Travis Windle, a spokesman for the Marcellus Shale Coalition, an industry group, said "shale production continues to soar" in the region, and the number of active drilling rigs is slowly increasing, too.
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