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Annual Energy Review

September 2012  PDF | previous editions
Release Date: September 27, 2012

Table 4.1 Technically Recoverable Crude Oil and Natural Gas Resource Estimates, 2009
Table 4.1  Technically Recoverable Crude Oil and Natural Gas Resource Estimates, 2009

Region
Proved Reserves 1
Unproved Resources		 Total Technically
Recoverable Resources 2
  Crude Oil and Lease Condensate (billion barrels)
  48 States 3 Onshore 14.2 112.6 126.7
  48 States 3 Offshore 4.6 50.3 54.8
  Alaska 3.6 35.0 38.6

  Total U.S.		 22.3 197.9 220.2
       
  Dry Natural Gas 4 (trillion cubic feet)
   Conventionally Reservoired Fields 5 105.5 904.0 1,009.5
      48 States 3 Onshore Gas 6 81.4 369.7 451.1
      48 States 3 Offshore Gas 7 15.0 262.6 277.6
      Alaska 9.1 271.7 280.8

   Tight Gas, 8 Shale Gas, 9 and Coalbed Methane 10		 167.1 1,026.7 1,193.8

   Total U.S.		 272.5 1,930.7 2,203.3
1See "Proved Reserves, Crude Oil," "Proved Reserves, Lease Condensate," and "Proved Reserves,
Natural Gas" in Glossary.		 7Includes Federal offshore and State offshore waters (near-shore, shallow-water areas under State
jurisdiction).
2"Technically recoverable" resources are those that are producible using current technology without
reference to the economic viability thereof.		 8Natural gas produced from a non-shale formation with extremely low permeability.
3"48 States" is the United States excluding Alaska and Hawaii. 9See "Shale Gas" in Glossary.
4Excludes natural gas plant liquids.  See "Natural Gas, Dry" in Glossary. 10See "Coalbed Methane" in Glossary.
5Conventionally reservoired deposits are discrete subsurface accumulations of crude oil or natural gas
usually defined, controlled, or limited by hydrocarbon/water contacts.		 Notes:  ·  See Tables 4.2 and 4.3 for more recent proved reserves data.  ·  Data are at end of year.
·  Resources in areas where drilling is officially prohibited are not included.  Estimates of the resources in
the Northern Atlantic, Northern and Central Pacific, and within a 50-mile buffer off the Mid and Southern
Atlantic Outer Continental Shelf (OCS) are also excluded from the technically recoverable volumes.
·  Totals may not equal sum of components due to independent rounding.
6Includes associated-dissolved (AD) natural gas that occurs in crude oil reservoirs either as free gas
(associated) or as gas in solution with crude oil (dissolved gas).		 Sources:  Proved Reserves:  U.S. Energy Information Administration (EIA), U.S. Crude Oil, Natural
Gas, and Natural Gas Liquids Proved Reserves, 2010 (August 2012).  Unproved Resources:  U.S.
Geological Survey National Oil and Gas Resource Assessment Team, with adjustments made to the shale
gas data by EIA, Office of Energy Analysis.  Total Technically Recoverable Resources:  Calculated as
the sum of proved reserves and unproved resources.
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