Comparison of free - state and asphaltene pyrolysis of n - alkanes in the deep and ultra deep layer of Tarim Basin
Asphaltene is the organic component with the highest molecular weight in crude oil, and its molecular structure is similar to that of the parent kerogen. Asphaltene is generally believed to be the product of the early formation stage of crude oil. The properties of the macromolecular polymer make the asphaltene resistant to biodegradation, Evaporation distillation, etc. Therefore, the molecular carbon isotope composition of crude pyrolysis products of asphaltene is often used to study oil-source contrast, crude oil classification and genesis of mixed oil and biodegradable oil.China Academy of Sciences Guangzhou Earth Jia Wanglu, an associate researcher at the Institute of Chemistry, conducted a molecular hydrogen isotopic analysis of crude asphaltene bonded n-alkanes using pyrolysis method. Combining with the results of carbon-hydrogen isotope analysis of crude n-alkanes, Genesis of Deep Basin - Ultra Deep Marine Crude Oil.
Through these efforts, two main understandings have been obtained: (1) An analytical method suitable for the hydrogen isotope analysis of n-alkanes in crude oil asphaltene has been established and the hydrogen isotopic composition obtained can reflect the variation of maternal characteristics.This method, combined with the carbon isotope determination results, Deep-ultra-deep high-mature light oil and severe biodegradable oil are of great significance in the research of crude oil classification which can not obtain reliable biomarker samples. (2) Comparative analysis of deep-ultra deep crude oil free-form and asphaltene pyrolysis n-paraffins in Tarim Basin The results show that the molecular hydrogen-carbon isotope weighted average data can be divided into two major categories of crude oil, of which the trend of isotope variation in the basin mainly reflects the degree of thermal evolution, maternal heterogeneity is the cause of the analysis needs to be considered The factors (Figure).
Research was funded by major national oil and gas projects, the research results published in the Journal of Analytical and Applied Pyrolysis on.
