Foreign energy firms -- including ConocoPhillips, BP and Statoil -- are spending at least $3 billion to drill several wells off the coast of Angola in 2014, according to Wood Mackenzie. "Angola is considered to have by far and away Africa's biggest pre-salt potential," said Wood Mackenzie analyst David Thomson. "Exploration looks set to deliver big oil and the next 18 months will help answer just how big."

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