For that indicator, The U.S. Energy Information Administration provides data for Vietnam from 1991 to 2019. The average value for Vietnam during that period was 1.63 billion barrels with a minumum of 0.5 billion barrels in 1991 and a maximum of 4.4 billion barrels in 2012.
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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.