Expulsion favors [[light compounds]] over [[heavy compounds]] and [[saturated hydrocarbons]] over [[aromatics]]. This is due to [[molecular filtering]] and [[adsorption]]–[[desorption]] phenomena, particularly during the early stages. However, because significant quantities of hydrocarbons are retained in the large and medium [[Pore system fundamentals|pore systems]] within the source rock, the correlation of reservoired oil with its respective source rock is not significantly affected (see also [[Oil-oil and oil-source rock correlation]]. The effect of continued [[maturation]] of the source rock after expulsion is a more significant impediment to correlation.
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Expulsion favors [[light compounds]] over [[heavy compounds]] and [[saturated hydrocarbons]] over [[Wikipedia:Aromatic hydrocarbon|aromatics]]. This is due to [[molecular filtering]] and [[adsorption]]–[[desorption]] phenomena, particularly during the early stages. However, because significant quantities of hydrocarbons are retained in the large and medium [[Pore system fundamentals|pore systems]] within the source rock, the correlation of reservoired oil with its respective source rock is not significantly affected (see also [[Oil-oil and oil-source rock correlation]]. The effect of continued [[maturation]] of the source rock after expulsion is a more significant impediment to correlation.