Samotlor Field is the largest oil field of Russia and the sixth largest in the world, owned and operated by Rosneft.The field is located at Lake Samotlor in Nizhnevartovsk district, Khanty–Mansi Autonomous Okrug, Tyumen Oblast.It covers 1,752 square kilometres (676 sq mi). This list of oil fields includes some major oil fields of the past and present.. The list is incomplete; there are more than 65,000 oil and gas fields of all sizes in the world. However, 94% of known oil is concentrated in fewer than 1500 giant and major fields. Most of the world's largest oilfields are located in the Middle East, but there are also supergiant (>10 billion bbls) oilfields in The petroleum industry in Russia is one of the largest in the world. Russia has the largest reserves and is the largest exporter of natural gas. It has the second largest coal reserves, the eighth largest oil reserves, and is one of the largest producers of oil. It is the third largest energy user.