Kerogen

Kerogen is a mixture of organic chemical compounds that make up a portion of the organic matter in sedimentary rocks. It is insoluble in normal organic solvents because of the huge molecular weight (upwards of 1,000 daltons or 1000 Da; 1Da= 1 atomic mass unit) of its component compounds. The soluble portion is known as bitumen. When heated to the right temperatures in the Earth's crust, (oil window ca. 60–160 °C, gas window ca. 150–200 °C, both depending on how quickly the source rock is heated) some types of kerogen release crude oil or natural gas, collectively known as hydrocarbons (fossil fuels). When such kerogens are present in high concentration in rocks such as shale they form possible source rocks. Shales rich in kerogens that have not been heated to a warmer temperature to release their hydrocarbons may form oil shale deposits.

The name "kerogen" was introduced by the Scottish organic chemist Alexander Crum Brown in 1912.

Read more about Kerogen:  Formation of Kerogen, Composition, Types

Other articles related to "kerogen":

Oil Shale Reserves - Definition of Reserves
... Firstly, the amount of kerogen contained in oil shale deposits varies considerably ... Secondly, some nations report as reserves the total amount of kerogen in place, including all kerogen regardless of technical or economic constraints these estimates do not consider the amount of ... may refer to all deposits containing kerogen ...
Catagenesis (geology) - Theoretical Reaction
... pressure dependent process which creates liquid and/or gaseous hydrocarbon Hc from primary kerogen X and can be summarised using the formula where X0 is the initial kerogen ... be given as a first-order differential equation where X is the reactant (kerogen) and κ is the reaction rate constant which introduces the temperature-dependence via the Arrhenius equation ...
Oil Shale - Geology
... mineral content, chemical composition, age, type of kerogen, and depositional history and not all oil shales would necessarily be classified as shales in the strict sense ... of oil, heat and pressure have not (yet) transformed the kerogen in oil shale into petroleum, that means that its maturation does not exceed early mesocatagenetic ... known as the van Krevelen diagram, assigns kerogen types, depending on the hydrogen, carbon, and oxygen content of oil shales' original organic matter ...
Kerogen - Origin of Material - Extra-terrestrial
... Carbonaceous chondrite meteorites contain kerogen-like components ... Kerogen materials have been detected in interstellar clouds and dust around stars ...
Petroleum Geochemistry
... plants and algae are altered to oil, gas, and kerogen ... Kerogen can be thought of as the remaining solid material of the plant ... reflectance laboratory pyrolysis and analysis kerogen typing and other more exotic techniques ...