Annual report pursuant to Section 13 and 15(d)

Capitalization of Exploratory Well Costs (Details)

v2.4.0.6
Capitalization of Exploratory Well Costs (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Number of development options [Member]
OptionPlan
Dec. 31, 2012
Etame Marin [Member]
Track
m
Jun. 30, 2012
North Tchibala [Member]
Dec. 31, 2012
Mutamba Iroru [Member]
Track
Capitalization of Exploratory Well Costs (Textual) [Abstract]          
Number of side tracks     2   3
Area of sand of oil     5    
Capitalization on development plan $ 5.9     $ 8.1  
Number of development options   2