Abstract
An isotopic type-curve has been defined based on the 13C 12C ratios of the saturated, aromatic, heterocomponent (NOSs), and asphaltene fractions of crude oils. These fractions show 13C enrichments with increasing polarity or polarizability. This systematic pattern can be used to estimate the 13C 12C ratio of the kerogen from which the oil had been generated. Genetically associated source rock oil pairs have been used to show that the difference between the measured and the estimated δ-values of kerogen is about −0.5%., and between the δ-values of the kerogen and the asphaltene fraction is approximately +0.6%.
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