Coal-Bed Gas

Major coal-bearing areas in the lower 48 States are shown in figure 8. The in-place resources of coal-bed gas are determined by the product of the coal tonnage and gas content. Although the in-place resources are very large for this type of accumulation, the main concern is recoverability. Figure 8 also shows the location of areas within which potential additions to reserves of coal-bed gas were quantitatively assessed for 39 plays. For this assessment, technically recoverable resources of coal-bed gas for the lower 48 States are estimated to range from 42.9 TCFG to 57.6 TCFG, with a mean estimate of 49.9 TCFG. Estimates for individual provinces and regions are presented in table 5. Note: Table 5 was subdivided into various Regions: Table5a contains Regions 2, 3, 4, & 7 Table5b contains Region 8

U.S. Geological Survey Circular 1118