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In short order estimates of the Earth's bounty of recoverable gas have expanded by about 40%.
It was discovered in 1979 and was estimated to contain some 1.3 tcm (45.9 tcf) of recoverable gas reserves.
Surveys suggest Oklahoma may have at least four times as much undiscovered, recoverable gas as proven reserves.
Although it is likely the figure for recoverable gas will be much lower, the iGas numbers raise the prospect of a boost to the UK's energy independence.
The project ExxonMobil is leading has estimated recoverable gas reserves as equal to almost a third of the company's total gas reserves.
But energy companies and experts say it is large, possibly the largest in the lower 48 states, with an estimated 250 trillion cubic feet of recoverable gas.
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These benefits have not gone unnoticed in Europe.The old continent has nearly as much technically recoverable shale gas (natural gas trapped in shale formations) as America.
To put that into perspective, most current estimates of the world's technically recoverable natural gas resources (not including shale gas) come in at 16,000 Tcf, which means shale resources add more than 40% to the world's gas volume.
Researchers at Penn State and the State University of New York at Fredonia estimate that the Marcellus has 50 trillion cubic feet of recoverable natural gas, roughly twice the amount of natural gas consumed in the United States last year.
This estimated range of technologically recoverable shale gas reservoirs could, if exploited completely, cover the current annual gas consumption of Germany for 8 to 27 years [2].
The US government assessed 32 countries in 2011 and concluded they had 169 trillion cubic metres of technically recoverable shale gas – around the same as the global economically recoverable reserves of conventional natural gas.
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