The 10 largest oil 1 producers and share of total world oil production 2 in 2018 3 . 1 Oil includes crude oil, all other petroleum liquids, and biofuels. 2 Production includes domestic production of crude oil, all other petroleum liquids, biofuels, and refinery processing gain. With 300,878 million barrels of proven reserves, Venezuela has the largest amount of proven oil reserves in the world. The country's oil is a relatively new discovery. Previously, Saudi Arabia had always held the number one position. The oil sand deposits in Venezuela are similar to those in Canada. A map of world oil reserves according to OPEC, January 2014 This is a list of countries by proven oil reserves . Proven reserves are those quantities of petroleum which, by analysis of geological and engineering data, can be estimated, with a high degree of confidence, to be commercially recoverable from a given date forward from known