Tight oil (also known as shale oil or light tight oil, abbreviated LTO) is petroleum 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 ...
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http://en.wikipedia.org/wiki/Tight_oil
Petroleum present in underground formations with low permeability, such as oil present in shales or sandstones.
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http://needtoknow.nas.edu/energy/glossary/
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