Deep formations (defined here as depths greater than 15,000ft) are one of the sources of natural gas that will play an important role in meeting the growing need for natural gas in the United States. The Energy Information Agency estimated 7% of U.S. gas production came from deep formations in 1999. This contribution is expected to increase to 14% by 2010. Much of this deep gas production will come from the Rocky Mountain, Gulf Coast and Gulf of Mexico (GOM) sedimentary basins (Figure 1).