Oil reserves - Country rankings:
The average for 2018 was 8.69 billion barrels.The highest value was in Venezuela: 302.25 billion barrels and the lowest value was in Afghanistan: 0 billion barrels. Below is a chart for all countries where data are available for: Oil reserves.
Oil reserves, billion barrels, 2018
(billion barrels, Source: The U.S. Energy Information Administration);
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.