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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
16,285 15,598 15,412 15,005 13,586 13,576 1977-2013
Adjustments
-6 525 -89 73 153 -202 1977-2013
Revision Increases
2,735 1,396 2,211 2,114 2,384 3,407 1977-2013
Revision Decreases
2,657 1,708 1,833 2,229 3,276 2,791 1977-2013
Sales
402 287 145 1,016 311 705 2000-2013
Acquisitions
192 292 419 1,078 115 594 2000-2013
Extensions
520 441 468 731 680 753 1977-2013
New Field Discoveries
0 1 0 3 1 0 1977-2013
New Reservoir Discoveries in Old Fields
7 3 3 9 4 89 1977-2013
Estimated Production
1,349 1,350 1,220 1,170 1,169 1,155 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