|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
|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.