Today, on average only 30% of known deposits of oil is recoverable (this figure can vary greatly). This will probably increase the recovery rate by technical progress, or when economic conditions warrant. Probable reserves are reserves in known deposits that the odds of one day being exploited are at least 50%. Possible reserves are reserves in known deposits whose probability of being exploited one day is 10 to 50%. The development of drilling techniques and recovery, economic conditions are some probable and possible reserves are gradually proved reserves.
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