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- Title
原油中金刚烷同系物同分异构体丰度差异及影响机制 ——以塔里木盆地轮古地区为例.
- Authors
王瑞林; 王霆; 朱光有; 王萌; 张志遥; 文志刚
- Abstract
Crude oil from the Lungu area of the Tarim Basin is mainly affected by gas washing and thermal cracking, which makes the oil enriched in diamondoids. This study applied GC-MS-MS on the whole oil samples for quantitative analysis of diamondoids. It was found that, either among the diamondoid isomers or the homologs, the oils at relatively low thermal maturity show the dominant abundance of secondary-substituted diamondoid isomers, while oils with higher thermal maturity show the dominance of tertiary-substituted isomers. The abundance difference of diamondoid structural isomers from the oils with a range of thermal maturity can be potentially used as a qualitative scale for oil maturity, especially at high thermal stage. The valence bond theory is used to figure out the chemical mechanism behind the aforementioned phenomena. Compared with that one sp3 hybrid orbital is occupied by C-H single bond in the secondary-substituted isomer, the four sp3 hybrid orbitals in the tertiary-substituted diamondoid isomer are occupied by C-C single bond making the whole molecule more stable. The coincidence degree of the atomic orbits in the tertiary-substituted isomers is higher with a greater bond dissociation energy than the secondary-substituted, which could be attributed to the observation that the thermal stability of diamondoid isomer with methyl substitution at bridgehead (tertiary-substituted) is higher than that of secondary-substituted methyl isomer. At the same time, the physical trait of decreasing saturated vapor pressure of compounds with increasing diamondoid carbon number explains the phenomena of differential enrichment of diamondoid series compounds by gas washing.
- Subjects
SATURATION vapor pressure; STRUCTURAL isomers; VALENCE bonds; PETROLEUM; DIAMONDOIDS; ISOMERS
- Publication
Natural Gas Geoscience, 2022, Vol 33, Issue 12, p2087
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2022.07.012