− | Different types of [[kerogen]]s convert to hydrocarbons at different rates, and they yield different quantities of various hydrocarbon phases. Therefore, one standard relationship between a measured maturity parameter and hydrocarbon generation does not exist. Values such as 0.6% 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). | + | Different types of [[kerogen]]s convert to hydrocarbons at different rates, and they yield different quantities of various hydrocarbon phases. Therefore, one standard relationship between a measured maturity parameter and hydrocarbon generation does not exist. Values such as 0.6% 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). |