Angola is sub-Saharan Africa's second largest crude producer after Nigeria, pumping 1,4-million barrels a day (bpd) and plans to increase production to 2 million bpd by 2008 with the help of billions of dollars of foreign investment.
Sonangol has previously said block 15 has up to 10.4-billion barrels of potential oil reserves.
Irish-based Tullow Oil and Gas Exploration won a 50% stake in shallow water Block 1, while US-based Vaalco Energy won a 40% stake in Block 5.
Brazil's state-owned Petrobras won a 40% stake in Block 6 and 80% in Block 26.
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