The low-carbon number group was mainly the combination of low aquatic organisms, while the later peak high-carbon number group was mainly the product of the biochemical interaction between aquatic and terrestrial plants. Previous studies on saturated hydrocarbon chromatogram showed that different peak values of carbon number could be used to determine the origin of hydrocarbon. The n-alkane components can reflect the type of organic matter, the nature of sedimentary environment, and the degree of thermal evolution. Since biomarkers are basically not affected by hydrocarbon secondary processes, they can provide more information about the origin of source rocks, sedimentary environment, and thermal maturity and play an important role in oil-source correlation. If the difference between the two results is small, it indicates that they are correlated. When using carbon isotopes to make oil source correlation, the carbon isotopic values of kerogen or extractable organic matter are mainly compared with those of hydrocarbon. At present, oil source correlation is mainly studied by carbon isotope characteristics and biomarkers. Oil source correlation is to clarify the migration path of oil and gas by studying this law. Therefore, the establishment of the connection between source rocks and reservoir can effectively guide the exploration and development of oil and gas. Along with the continuous discoveries of oil and gas in the Minfeng area in recent years, the oil-source relationship has attracted researchers’ attention gradually.Īlthough the physical and chemical properties of hydrocarbon from the same set of source rocks change slightly in the process of hydrocarbon migration, they still show certain regularity. Therefore, the oil-source correlation is conducted at each confidence level for reservoir exploration and development in all sedimentary basins. Identifying the source of discovered oil (also called oil-source correlation) is of vital significance for oil petroleum exploration and development.
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