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Estimated Dry Natural Gas contained in Total Natural Gas Proved Reserves
(Billion Cubic Feet)
Area: Period:
 Annual 
 Show Data By:
Data Series Area
2008 2009 2010 2011 2012 2013 View
History
Proved Reserves as of Dec. 31
20,845 22,769 26,345 27,830 26,599 26,873 1977-2013
Adjustments
99 984 -394 -368 -686 -622 1977-2013
Revision Increases
2,786 2,894 3,224 5,142 4,153 4,118 1977-2013
Revision Decreases
2,580 3,592 3,474 6,856 7,731 5,031 1977-2013
Sales
395 600 219 2,995 1,133 733 2000-2013
Acquisitions
599 387 1,519 2,459 975 738 2000-2013
Extensions
2,974 3,463 4,571 5,735 4,903 3,300 1977-2013
New Field Discoveries
21 0 51 47 44 2 1977-2013
New Reservoir Discoveries in Old Fields
85 178 1 18 7 392 1977-2013
Estimated Production
1,775 1,790 1,703 1,697 1,763 1,890 1977-2013
- = No Data Reported;  -- = Not Applicable;  NA = Not Available;  W = Withheld to avoid disclosure of individual company data.
Notes: Miscellaneous States includes Arizona, Illinois, Indiana, Maryland, Missouri, Nebraska, Nevada, Oregon, South Dakota, and Tennessee. Estimated Dry Natural Gas is calculated from Total Natural Gas Proved Reserves.  See Definitions, Sources, and Notes link above for more information on this table.
Release Date: 12/4/2014
Next Release Date: 12/31/2015