Tight oil (also known as light tight oil, abbreviated LTO) is a petroleum play that consists of light crude oil contained in petroleum-bearing formations of low permeability, often shale or tight sandstone. Economic production from tight oil formations requires the same hydraulic fracturing and often uses the same horizontal well technology used in the production of shale gas. It should not be confused with shale oil, which is oil manufactured from oil shale by heating kerogen-rich rock.
Tight oil formations include the Bakken Shale, the Niobrara Formation, Barnett Shale, and the Eagle Ford Shale in the United States, R'Mah Formation in Syria, Sargelu Formation in the northern Persian Gulf region, Athel Formation in Oman, Bazhenov Formation and Achimov Formation of West Siberia in Russia, in Coober Peby in Australia, Chicontepec Formation in Mexico,, and the Vaca Muerta oil field in Argentina.
See also 
- Mills, Robin M. (2008). The myth of the oil crisis: overcoming the challenges of depletion, geopolitics, and global warming. Greenwood Publishing Group. pp. 158–159. ISBN 978-0-313-36498-3.
- IEA (29 May 2012). Golden Rules for a Golden Age of Gas. World Energy Outlook Special Report on Unconventional Gas (PDF). OECD. p. 21.
- Bloomberg (May 17, 2013). "Chevron says shale to help make Argentina energy independent". FuelFix. Retrieved May 18, 2013.
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