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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
2,799 2,844 2,876 2,519 3,029 2,718 1977-2013
Adjustments
-39 159 3 -36 270 -160 1977-2013
Revision Increases
479 617 490 604 718 275 1977-2013
Revision Decreases
738 610 615 504 491 502 1977-2013
Sales
141 44 69 586 52 85 2000-2013
Acquisitions
134 48 243 367 100 272 2000-2013
Extensions
223 285 280 100 306 247 1977-2013
New Field Discoveries
34 4 1 47 5 0 1977-2013
New Reservoir Discoveries in Old Fields
63 55 93 24 13 21 1977-2013
Estimated Production
539 469 394 373 359 379 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