Oil reserves - Country rankings:
The average for 2019 was 8.66 billion barrels.The highest value was in Venezuela: 302.81 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, 2019
(billion barrels, Source: The U.S. Energy Information Administration, TheGlobalEconomy.com)