Characteristics of Aromatic Hydrocarbons and Its Stable Carbon Isotope Compositions in Crude Oils

Abstract

In this paper, relative contents, characteristic ratios and stable carbon isotope compositions of aromatic hydrocarbons in crude oils were determined from different areas. In terms of aromatic hydrocarbons relative contents, two kinds of crude oils have shown their own features. From the characteristics of the ratios of aromatic hydrocarbon in crude oil, the maturity parameters (MNR, TNR1, TNR2, MPR, MPI1, MPDF1 and MPDF2) reflected high maturity of all the crude oil. Other parameters, such as DNR1, DNR2 and TNR4, revealed the organic source and biodegradation of crude oil and other information. From the compositions of stable carbon isotope of aromatic hydrocarbons in crude oils, crude oils between the various regions have the differences. Plots of aromatic hydrocarbon ratios versus δ13 C values of dimethylnaphthalene and phenanthrene were constructed to discriminate crude oils from different areas. The results demonstrate that this method can distinguish different kinds of crude oisl more effectively.