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Unconventional gas vital to US supply
Sam Fletcher, Oil & Gas Journal, February 28, 2005

Unconventional gas resources have become a major source of US supply over the last 20 years and will be even more important in the future. US gas supplies increased overall to 19.4 tcf in 2003 from 19.2 tcf in 2000. Yet conventional gas production declined in that same period, while unconventional gas production increased by 1 tcf. Production of tight-sands gas increased to 4.6 tcf from 4 tcf, while coalbed methane (CBM) production rose to 1.6 tcf from 1.4 tcf. 

Major US supply role seen for unconventional gas
Sam Fletcher, Oil & Gas Journal, December 20, 2004

Over the last 20 years, unconventional natural gas in the US has grown from "just modest expectations back in the early 1980s" to become one of the dominant forces of gas supply, said Scott R. Reeves, executive vice-president of Advanced Resources International Inc., Houston, at a 2-day conference in Denver.

Tight-gas myths, realities have strong implications for resource estimation, policymaking, operating strategies
Keith W. Shanley, John Robinson, Robert M. Cluff, Oil & Gas Journal, August 2, 2004

Natural gas demand in the US is expected to grow from 23 tcf/year now to 30-34 tcf/year by the year 2025.  Most gas producing regions are expected to decline, but gas production from unconventional sources, most notably tight-gas sandstones, are expected to provide a large proportion of this future gas supply.

Mature-basin leftovers
Guntis Moritis, Oil & Gas Journal, October 10, 2005

Many of the world’s mature producing regions still contain sizable volumes of potentially recoverable hydrocarbons, although these resources typically are in less conventional types of reservoirs. For instance, a recent report from the Interstate Oil and Gas Compact Commission estimates that the 180,000 sq mile Appalachian and 53,000 sq mile Illinois basins still contain 4.8 billion bbl of oil and 79-96 tcf of gas that can be recovered, primarily from coalbeds, Devonian shales, and low-permeability gas sands, as well as deeper formations.