“The estimated unproved technically recoverable resource (TRR) of shale gas for the United States is 482 trillion cubic feet, substantially below the estimate of 827 trillion cubic feet in AEO2011. The decline largely reflects a decrease in the estimate for the Marcellus shale, from 410 trillion cubic feet to 141 trillion cubic feet.” Quoted from the Annual Energy Outlook 2012 Early Release.
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- 2011 Assessment of Marcellus Shale Gas Resources
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