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

Table 4 Technically recoverable natural gas reserves in the United States

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

ISSN: 2661-801X