These are reservations that are made up of the known deposits, including oil at least 90% chance of being recovered. Clearly these are reserves that can happen to quantify, and that one is able to operate on technical and economic criteria. Different sources, such as BP Statistical Review, the United States Geological Survey, Oil and Gas Journal, give figures ranging from 1,000 to 1,265 billion barrels, from 140 to 180 billion tons.
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