2011. In this annual information form - Encana

Reconciliation of Changes in Reserves (Before Royalties)
The following tables provide a reconciliation of Encana’s gross reserves of natural gas, oil and NGLs for the year
ended December 31, 2011, presented using forecast prices and costs.
Proved Reserves
(Forecast Prices and Costs; Before Royalties)
Canadian Division
Natural Gas (Bcf)
Coalbed Methane Shale Gas Other Total
Oil & NGLs
(MMbbls)
Total
(Bcfe)
December 31, 2010 1,810 511 4,434 6,755 61.9 7,126
Extensions and improved
148 138 522 808 48.9 1,101
recovery
Technical revisions 32 225 132 389 6.5 428
Discoveries - - 10 10 0.8 15
Acquisitions 25 - 57 82 0.3 84
Dispositions (5) (33) (149) (187) (6.1) (223)
Economic factors (30) (134) (70) (234) 0.2 (233)
Production (161) (34) (361) (556) (6.0) (592)
December 31, 2011 1,819 673 4,575 7,067 106.5 7,706
USA Division
Natural Gas (Bcf)
Coalbed Methane Shale Gas Other Total
Oil & NGLs
(MMbbls)
Total
(Bcfe)
December 31, 2010 - 3,445 5,854 9,299 47.4 9,584
Extensions and improved
- 675 211 886 1.8 898
recovery
Technical revisions - 587 (14) 573 2.4 587
Discoveries - - 1 1 1.9 12
Acquisitions - - 28 28 - 28
Dispositions - (1,100) (216) (1,316) (1.8) (1,327)
Economic factors - (138) (44) (182) (0.1) (183)
Production - (293) (564) (857) (4.3) (883)
December 31, 2011 - 3,176 5,256 8,432 47.3 8,716
Total Encana
Natural Gas (Bcf)
Coalbed Methane Shale Gas Other Total
Oil & NGLs
(MMbbls)
Total
(Bcfe)
December 31, 2010 1,810 3,956 10,288 16,054 109.3 16,710
Extensions and improved
recovery
148 813 733 1,694 50.7 1,999
Technical revisions 32 812 118 962 8.9 1,015
Discoveries - - 11 11 2.7 27
Acquisitions 25 - 85 110 0.3 112
Dispositions (5) (1,133) (365) (1,503) (7.9) (1,550)
Economic factors (30) (272) (114) (416) 0.1 (416)
Production (161) (327) (925) (1,413) (10.3) (1,475)
December 31, 2011 1,819 3,849 9,831 15,499 153.8 16,422
Encana Corporation
A-7
Canadian Protocol Reserves Disclosure
Annual Information Form (prepared in US$)