| 21. | The country with the biggest proven reserves, Saudi Arabia, has 258 billion barrels.
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| 22. | In January, Shell cut its proven reserves by 3 . 9 billion barrels.
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| 23. | In 1992, its proven reserve were estimated at 400, 000 million cubic meters.
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| 24. | But 112 billion barrels of proven reserves is also something nobody can overlook.
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| 25. | In January, Shell cut its proven reserves by 3.9 billion barrels.
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| 26. | New proven reserves are commonly added by new field discoveries.
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| 27. | The two Colombian fields have proven reserves of about 2 billion barrels of oil.
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| 28. | They have only recently been considered proven reserves of oil.
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| 29. | Iraq's proven reserves are now the world's second largest after those of Saudi Arabia.
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| 30. | Price changes therefore can have a large impact on the classification of proven reserves.
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