Oil is generally a product of thermal breakdown of type I and type II kerogen during catagenesis, thus its D content should reflect both source kerogen signal, generation fractionation, isotopic exchange and other maturation effects.
Oil is generally a product of thermal breakdown of type I and type II kerogen during catagenesis. Its D content should reflect both source kerogen signal. Its D content should reflect generation fractionation. Its D content should reflect isotopic exchange. Its D content should reflect other maturation effects.