RESULTS OF THE ASSESSMENT - NGL

We estimate the undiscovered technically recoverable resources of natural gas liquids in conventional accumulations to range from 5.8 BBNGL (billion barrels of natural gas liquids) at a 95 percent probability to as much as 8.9 BBNGL at a 5 percent probability. The mean estimate of undiscovered NGL is 7.2 BBNGL. Estimated NGL resources are tabulated by region and by province in table 2. Figures 9 and 10 show, by use of mean values, the distribution of undiscovered resources of oil and gas by region. We estimate that approximately 28 percent of the undiscovered oil resources and 26 percent of the undiscovered gas resources exist in Alaska (Region 1-see fig. 3); approximately 13 percent of undiscovered oil resources and 5 percent of undiscovered gas resources exist in California and the remainder of the Pacific Coast (Region 2-see fig. 3); and 18 percent of the undiscovered oil resources and 38 percent of the undiscovered gas resources exist in the Gulf Coast (Region 6-see fig. 3). Of the remaining undiscovered resources, approximately 41 percent of the oil resources and 31 percent of the natural gas resources are distributed among the remaining five regions (Regions 3, 4, 5, 7, and 8 see fig. 3. Undiscovered conventional oil and gas resources are estimated within ranges of probability. Estimated national totals for undiscovered conventional oil and gas resources of the onshore and State waters of the United States are listed in table 1 and illustrated in figures 11 and 12. Ranges of probability for resources by region and province are listed in table 2. Note: Table 2 was subdivided into various Regions: Table2a contains Regions 1 & 2 Table2b contains Regions 3 & 4 Table2c contains Regions 5, 6 & 7 Table2d contains Region 8

U.S. Geological Survey Circular 1118