Oil-bearing rock formation in Russia
The Bazhenov Formation or Bazhenov Shale is a geological stratum in the West Siberian basin. It was formed from sediment deposited in a deep-water sea in Tithonian–early Berriasian time. The sea covered more than one million square kilometers in the central basin area. Highly organic-rich siliceous shales were deposited during this time in anoxic conditions on the sea bottom. The sea was connected to the world's oceans and contains trace minerals derived from dissolved minerals and organic materials similar to sapropel sediments in the Black Sea.
In addition to being a prolific deep water marine source rock (the International Energy Agency has called it the world's largest oil source rock) the formation is believed to contain substantial reserves of unconventional liquid hydrocarbons in form of tight oil and solid hydrocarbons in form of kerogen. These deposits occur at depths of with the thickness from .
An estimate by Wood Mackenzie of the Bazhenov Formation puts oil in place at . In 2013, the Russian oil company Rosneft estimated recoverable reserves of for the formation. The Russian government agency Rosnedra estimated in 2012 that the Bazhenov contained 180 to 360 billion barrels of recoverable reserves. According to U.S. Energy Information Administration estimates published in June 2013, the total Bazhenov shale prospective area has a resource of a risked tight oil in-place of and a risked shale gas in-place of , with of oil and of gas as the risked, technically recoverable. Total hydrocarbon resources are estimated in 50 to 150 billion tonnes.
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