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Table 4 Technically recoverable natural gas reserves in the United States

From: The role of natural gas as a primary fuel in the near future, including comparisons of acquisition, transmission and waste handling costs of as with competitive alternatives

Non-associated gas  
Natural gas resource category (trillion cubic feet) As of January 1, 2007
Undiscovered 373.20
Onshore 113.61
Offshore 259.59
Inferred reserves 220.14
Onshore 171.05
Offshore 49.09
Unconventional gas recovery 644.92
Tight gas 309.58
Shale gas 267.26
Coalbed methane 68.09
Associated-dissolved gas 128.69
Total lower 48 unproved 1366.96
Alaska 169.43
Total U.S. unproved 1536.38
Proved reserves 211.09
Total natural gas 1747.47
  1. Source: Energy Information Administration - Annual Energy Outlook 2009