Changes

==What is kerogen?==

==What is kerogen?==

Geochemists<ref name=ch06r5>Durand, B., 1980, Sedimentary organic matter and kerogen: definition and quantitative importance of kerogen, in B. Durand, ed., Kerogen: Techniq, p. 13–14.</ref><ref name=ch06r12>Tissot, B. P., and D. H. Welte, 1984, Petroleum Formation and Occurrence, 2 ed.: New York, Springer-Verlag, 699 p. The best overall reference for petroleum geochemistry.</ref> define kerogen as the fraction of sedimentary organic constituent of sedimentary rocks that is insoluble in the usual organic solvents. Kerogens are composed of a variety of organic materials, including algae, pollen, wood, [http://www.glossary.oilfield.slb.com/en/Terms/v/vitrinite.aspx vitrinite], and structureless material. The types of kerogens present in a rock largely control the type of hydrocarbons generated in that rock. Different types of kerogen contain different amounts of hydrogen relative to carbon and oxygen. The hydrogen content of kerogen is the controlling factor for oil vs. gas yields from the primary hydrocarbon-generating reactions.

Geochemists<ref name=ch06r5>Durand, B., 1980, Sedimentary organic matter and kerogen: definition and quantitative importance of kerogen, in B. Durand, ed., Kerogen: Techniq, p. 13–14.</ref><ref name=ch06r12>Tissot, B. P., and D. H. Welte, 1984, Petroleum Formation and Occurrence, 2 ed.: New York, Springer-Verlag, 699 p. The best overall reference for petroleum geochemistry.</ref> define kerogen as the fraction of sedimentary organic constituent of sedimentary rocks that is insoluble in the usual organic solvents. Kerogens are composed of a variety of organic materials, including algae, pollen, wood, [[Thermal maturation#Vitrinite|vitrinite]], and structureless material. The types of [[kerogen]]s present in a rock largely control the type of hydrocarbons generated in that rock. Different types of kerogen contain different amounts of hydrogen relative to carbon and oxygen. The hydrogen content of kerogen is the controlling factor for oil vs. gas yields from the primary hydrocarbon-generating reactions.

Structured kerogens include woody, herbaceous, vitrinite, and [[inertinite]]. Amorphous kerogens are by far the most prevalent and include most of the algal material.

Structured kerogens include woody, herbaceous, [[Thermal maturation#Vitrinite|vitrinite]], and [[inertinite]]. Amorphous kerogens are by far the most prevalent and include most of the algal material.

==Kerogen quality==

==Kerogen quality==

|-

|-

| IV

| IV

| Neither (primarily composed of vitrinite) or inert material

| Neither (primarily composed of [[Thermal maturation#Vitrinite|vitrinite]]) or inert material

| None

| None

| Terrestrial(?)

| Terrestrial(?)

|-

|-

! Hydrocarbon generation zone

! Hydrocarbon generation zone

! Vitrinite refl., % R_o, Type II

! [[Vitrinite reflectance|Vitrinite refl.]], % R_o, Type II

! Vitrinite refl., % R_o, Type III

! Vitrinite refl., % R_o, Type III

! Transformation ratio, %, Type II

! Transformation ratio, %, Type II