Source: Adapted from Christopher J. Schenk and Richard M. Pollastro, “Natural Gas Production in the United States: National Assessment of Oil and Gas Fact Sheet,” U.S. Geological Survey, January 2002, Figure 1. Artwork prepared by Ira G. Liss.
Source: Slightly adapted from Stephen A. Holditch, “Tight Gas Sands,” Journal of Petroleum Technology, June 2006, 84–90. Figure 1, p. 84.
Source: Adapted from U.S. Energy Information Administration, “Review ...