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OIL RESERVES      
      
 



 

  
proved developed and undeveloped reserves      
Balance at December 31, 2008 
 
 
 
 


Balance at December 31, 2009 
 
 

 
 

Balance at December 31, 2010 1,460904622,012
 (71)(3)(60)(134)
 1351650201
 84315
 7878

(84)(11)(69)(164)
Balance at December 31, 2011 1,526963862,008
proved developed reserves      
 
 
 
December 31, 2011 (e) 1,146693171,532
proved undeveloped reserves      
 
 
 
December 31, 2011 (f) 3802769476
 


 


 
 
 

 

