Abstract
The geochemical characteristics of about 30 crude oil samples collected from Baiyun Sag were studied. These oil samples can be divided into two classes: class A and B, and 5 subclasses (A1.A2.A3.B1.B2). Samples in class A are located in the northern part of the sag, adjacent to Panyu Lower Uplift; samples in class B are located in the eastern part of the sag. Crude oils in Baiyun Sag indicate an oxidizing type of depositional environment, with a notable higher plant input, and mainly reflecting the lacustrine facies sedimentary characteristics. Oil samples are mature-high mature oil, with aromatic hydrocarbons having a wider range of chemical kinetics than saturated hydrocarbons, aromatic hydrocarbon maturity parameters are well pronounced and provide an effective means of measuring maturity compared to saturated hydrocarbon maturity parameters. In this study, based on integrated analysis of various parameters, the crude oils show mature-high mature oil characteristics, whereas class A has a high maturity compared to B.
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