Oil shale
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Oil shale is an organic-rich fine-grained sedimentary rock containing kerogen from which liquid hydrocarbons can be produced. In addition to kerogen, general composition of oil shales constitutes inor
Outcrop of Ordovician oil shale (kukersite), northern Estonia
Photomicrographs showing a cannel coal (top) 100% organic matrix and a rich oil shale (bottom) with relatively low mineral content
Fossils in Ordovician oil shale (kukersite), northern Estonia
Autun oil shale mines
Petroleum
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Petroleum, also known as crude oil or simply oil, is a natural resource that appears as a yellowish-black liquid chemical mixture found in geological formations, consisting primarily of hydrocarbons.
A sample of petroleum
Pumpjack pumping an oil well near Lubbock, Texas, U.S.
An oil refinery in Ahmadi Governorate in Kuwait
An oil derrick in Okemah, Oklahoma in 1922