WikiWealth

"Russia holds the world's largest natural gas reserves, the second largest coal reserves, and the eighth largest oil reserves. Russia is also the world's largest exporter of natural gas, the second largest oil exporter and the third largest energy consumer. Most of the oil reserves are located in the Tartarstan and Chechen- Ingueshetia Republic and in western Siberia also known as the Tyumen oblast."

Sources

http://internationalbusiness.wikia.com/wiki/Oil_and_energy
http://internationaltrade.suite101.com/article.cfm/top_ten_oil_countries
http://www.nationsencyclopedia.com/Europe/Russia.html