Table 5-5 World Petroleum Resources

Table 5-5
World Petroleum Resources

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Resource Cumulative quantity
(Trillion barrels)
Years remaining
Current
consumption
Consumption
growing 2%
annually
Proven reserves 1 42 30
USGS identified reserves 1.1 46 33
Ultimate resources 1.7 71 44
Enhanced recovery 34% to 50% 2.8 117 60
Unconventional oil resources 3.4 142 67
Oil shale and tar sands 17.4 725 137

Current consumption rate of 0.024 trillion barrels per year.
Source: C.D. Masters, E.D. Attanasi, and D.H. Root. World Petroleum Assessment and Analysis, Proceedings of the 14th World Petroleum Congress (New York, NY: John Wiley and Sons, 1994).