List of countries by proven oil reserves
This is a list of countries by proven oil reserves.
Proved 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 reservoirs and under current economic conditions.
Some statistics on this page are disputed and controversial. Different sources (OPEC, CIA World Factbook, oil companies) give different figures and there are different types of oil, ranging from cheap and easy to recover oils to shale oil or oil sands, which are more expensive and difficult to recover. For example, in the list below, Australia's total amount of oil does not include the shale oil 
Because proven reserves includes oil recoverable under current economic conditions, nations may see large increases in proved reserves when known but previously uneconomic deposits become economic to develop. In this way Canada's proven reserves increased suddenly in 2003 when the oil sands of Alberta were seen to be economically viable. Similarly, Venezuela's proven reserves jumped in the late 2000s when the heavy oil of the Orinoco was judged economic.
Reserves amounts are listed in millions of barrels (MMbbl).
- US Energy Information Administration, International energy statistics, (proved reserves as of 2013).
- US Energy Information Administration, International energy statistics, (proved reserves as of 2012).
- "Oil and gas in Yemen". NOREF peacebuilding. Retrieved 25 December 2013.
- "Energy and Minerals in Yemen". US Energy information Administration. Retrieved 24 December 2013.
- "Minerals in Afghanistan". USGS Minerals gov. Retrieved 24 December 2013.
- "OPEC: World proven crude oil reserves by country, 1960-2011". Opec.org. Retrieved 2013-09-21.