收稿日期: 2009-04-06
修回日期: 2009-05-28
网络出版日期: 2009-10-10
基金资助
国家自然科学基金项目(编号:40573030)资助.
Geochemical Characteristics of Light Hydrocarbons in Tuha Basin
Received date: 2009-04-06
Revised date: 2009-05-28
Online published: 2009-10-10
梁婉如,张敏,赵红静 . 吐哈盆地原油轻烃地球化学特征[J]. 天然气地球科学, 2009 , 20(5) : 763 -767 . DOI: 10.11764/j.issn.1672-1926.2009.05.763
The compositional characteristics of light hydrocarbons, Mango parameter and maturity for 23 crude oil samples in the Tuha basin were studied systematically. The results show that the crude oils are rich in cyclanes, and the straight chain alkanes content is very low, dominated by terrestrial organic matter. The MCHI indicates that the crude oils contain Type Ⅲ kerogen. N61/N51and(N61+N51)/(P2+P3+ N2 ratios of light hydrocarbon compounds have different molecular structural type, suggesting that the crude oils belong to terrestrial oils. Compositional characteristics of C7 light hydrocarbon fractions show that the methylcyclohexane content is higher than 50%, the dimethylcyclopentane content is lower than 9%, the heptane content is lower than 40%. The data is characteristic of coal generated oils and mixed crude oils. The Heptane values and isoheptane values indicate that the crude oils are in the normal mature stage. The maximum generating temperature of the crude oils is between 91.16℃ and 102.22℃.
Key words: Tuha basin; Crude oil; Light hydrocarbon; Steady state catalysis; Geochemistry.
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