For that indicator, The U.S. Energy Information Administration provides data for Kazakhstan from 1997 to 2019. The average value for Kazakhstan during that period was 19.93 billion barrels with a minumum of 5.4 billion barrels in 1997 and a maximum of 30 billion barrels in 2007.
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Definition: Proved reserves of crude oil are the estimated quantities of all liquids defined as crude oil, which geological and engineering data demonstrate with reasonable certainty to be recoverable in future years from reservoirs under existing economic and operating conditions.