− | Different types of [[kerogen]]s convert to hydrocarbons at different rates, and they yield different quantities of various [[hydrocarbon phase]]s. Therefore, one standard relationship between a measured maturity parameter and [[Petroleum generation|hydrocarbon generation]] does not exist. Values such as 0.6% [[vitrinite reflectance]] (R<sub>o</sub>) are generally associated with the onset of oil generation or indicate the top of the oil window. However, this generality applies only if a [[source rock]] is composed of pure [[Kerogen types|type II organic matter]] (marine kerogen). | + | Different types of [[kerogen]]s convert to hydrocarbons at different rates, and they yield different quantities of various [[hydrocarbon phase]]s. Therefore, one standard relationship between a measured maturity parameter and [[Petroleum generation|hydrocarbon generation]] does not exist. Values such as 0.6% [[vitrinite reflectance]] (R<sub>o</sub>) are generally associated with the onset of oil generation or indicate the top of the oil window. However, this generality applies only if a [[source rock]] is composed of pure type II organic matter (marine kerogen). |