Oil shale, too known equally kerogen shale, is an organic-rich fine-grained sedimentary stone containing kerogen (a enterprise mixture of organic chemic compounds) from which liquid hydrocarbons called shale oil (not to last confused alongside tight oil—crude oil occurring naturally inward shales) tin lavatory last produced. Shale oil is a substitute for conventional unsmooth oil; however, extracting shale oil from oil shale is to a greater extent than costly than the production of conventional unsmooth oil both financially together with inward price of its environmental impact. Deposits of oil shale hap about the world, including major deposits inward the United States. Estimates of global deposits arrive at from 2.8 to 3.3 trillion barrels (450×109 to 520×109 m3) of recoverable oil.
Heating oil shale to a sufficiently high temperature causes the chemic procedure of pyrolysis to yield a vapor. Upon cooling the vapor, the liquid shale oil—an unconventional oil—is separated from combustible oil-shale gas (the term shale gas tin lavatory too get upward to gas occurring naturally inward shales). Oil shale tin lavatory too last burned straight inward furnaces equally a low-grade fuel for ability generation together with district heating or used equally a raw cloth inward chemic together with construction-materials processing.
General composition of oil shales constitutes inorganic matrix, bitumens, together with kerogen. While the bitumen component division of oil shales is soluble inward carbon disulfide, kerogen component division is insoluble inward carbon disulfide together with tin lavatory comprise iron, vanadium, nickel, molybdenum, together with uranium.Oil shale contains a lower percent of organic affair than coal. In commercial grades of oil shale the ratio of organic affair to mineral affair lies or together with then betwixt 0.75:5 together with 1.5:5. At the same time, the organic affair inward oil shale has an atomic ratio of hydrogen to carbon (H/C) or together with then 1.2 to 1.8 times lower than for unsmooth oil together with virtually 1.5 to three times higher than for coals.