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Natural Gas Proved Reserves, Wet After Lease Separation
(Billion Cubic Feet)
Area: Period:
 Annual 
 Show Data By:
Data Series Area
2005 2006 2007 2008 2009 2010 View
History
Proved Reserves as of Dec. 31
17,122 17,682 22,480 24,169 24,081 25,372 1979-2010
Adjustments
21 42 100 -74 488 646 1979-2010
Revision Increases
2,082 1,215 4,037 3,365 1,672 3,127 1979-2010
Revision Decreases
1,525 1,571 598 3,142 4,224 3,834 1979-2010
Sales
1,278 1,587 772 775 391 255 2000-2010
Acquisitions
1,824 1,588 463 1,396 456 241 2000-2010
Extensions
1,851 2,042 2,893 2,379 3,495 2,986 1979-2010
New Field Discoveries
33 15 15 18 8 23 1979-2010
New Reservoir Discoveries in Old Fields
4 27 24 17 0 29 1979-2010
Estimated Production
1,139 1,211 1,364 1,495 1,592 1,672 1979-2010
- = 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.  See Definitions, Sources, and Notes link above for more information on this table.
Release Date: 8/2/2012
Next Release Date: 8/30/2013