VAALCO Energy, Inc. Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Supplemental Information on Oil and Gas Producing Activities (Details Textual)

Supplemental Information on Oil and Gas Producing Activities (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012 Well	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Supplemental Information on Oil and Gas Producing Activities (Textual) [Abstract]
Exploration expense	$ 37,300,000	$ 100,000	$ 2,600,000
Unsuccessful exploration wells	5
Percentage of working interest acquired	31.00%
Acquisition of Working Interest, cost	10,000,000
Asset retirement cost	10,368,000	14,528,000	13,425,000	10,666,000
Future development costs	45,700,000
Etame [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Period of development	20 years
Expiration of development	expire in 2021
Exploration area expiration year	expires in July 2014
Supplemental Information on Oil and Gas Producing Activities (Textual) [Abstract]
Exploration area expiration year	expires in July 2014
Avouma [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Period of development	20 years
Expiration of development	expire in 2025
Ebouri [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Period of development	20 years
Expiration of development	expire in 2026
Consortium [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Percentage of production	70.00%
Net cost account	1,200,000
Theoretical cost	1,197,000	1,303,000	1,200,000
Production rate, ,Minimum	5,000
Production Rate Maximum	25,000
Cost recovered	367,000	304,000	838,000
Supplemental Information on Oil and Gas Producing Activities (Textual) [Abstract]
Production rate, ,Minimum	5,000
Production Rate Maximum	25,000
Cost recovered	367,000	304,000	838,000
Theoretical cost	1,197,000	1,303,000	1,200,000
Mutamba Iroru [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Percentage of production	70.00%
Net cost account	34,100,000
Proved reserves	0
Production rate, ,Minimum	7,500
Production Rate Maximum	20,000
Supplemental Information on Oil and Gas Producing Activities (Textual) [Abstract]
Production rate, ,Minimum	7,500
Production Rate Maximum	20,000
Proved reserves	0
Block 5 Production [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Percentage of production	50.00%
Net cost account	0
Period of development	20 years
Proved reserves	0
Royalty Payments	0
Supplemental Information on Oil and Gas Producing Activities (Textual) [Abstract]
Proved reserves	0
Block P Production [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Percentage of production	70.00%
Period of development	25 years
Proved reserves	0
Income tax on net profits	25.00%
Supplemental Information on Oil and Gas Producing Activities (Textual) [Abstract]
Proved reserves	0
Gabon [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Contractual price	113.08
Fixed royalty rate	13.00%
Royalty rates	13.00%
Supplemental Information on Oil and Gas Producing Activities (Textual) [Abstract]
Future development costs	4,022,000	8,011,000	29,927,000
United States [Member]
Supplemental Information on Oil and Gas Producing Activities (Textual) [Abstract]
Future development costs	$ 9,689,000	$ 14,936,000
United States [Member] \| Oil [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Contractual price	85.07
United States [Member] \| Gas [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Contractual price	3.515
Maximum [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Net share that the consortium receives from production, Maximum	82.50%
Maximum [Member] \| Consortium [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Percentage of contract area, Maximum	60.00%
Maximum [Member] \| Mutamba Iroru [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Percentage of contract area, Maximum	63.00%
Net share that the consortium receives from production, Maximum	85.00%
Maximum [Member] \| Block 5 Production [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Percentage of contract area, Maximum	90.00%
Maximum [Member] \| Block P Production [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Fixed royalty rate	16.00%
Percentage of contract area, Maximum	60.00%
Royalty rates	16.00%
Minimum [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Net share that the consortium receives from production, Minimum	67.70%
Minimum [Member] \| Consortium [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Percentage of contract area, Minimum	50.00%
Minimum [Member] \| Mutamba Iroru [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Percentage of contract area, Minimum	50.00%
Net share that the consortium receives from production, Minimum	72.00%
Minimum [Member] \| Block 5 Production [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Percentage of contract area, Minimum	30.00%
Minimum [Member] \| Block P Production [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Fixed royalty rate	10.00%
Percentage of contract area, Minimum	10.00%
Royalty rates	10.00%