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Total possible oil reserves
Conventional is about 3.5 trillion bbls (of which 1.1 tr has been used); 1-2 trillion bbls of sand and extra heavy oil; including oil shale, the total long-term potentially recoverable oil reserves base is about 6.5 trillion bbls; if you include coal to oil, then it is about 9 trillion bbls - IEA, 2007
Tags : oil reserves oil shale tar sands heavy oil coal to oil
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