天然气地球化学

吐哈盆地原油轻烃地球化学特征

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  • 1. 长江大学油气资源与勘探技术教育部重点实验室, 湖北 荆州 434023;
    2. 长江大学地球化学系, 湖北 荆州 434023

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

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  • 1. Ministry of Education Key Laboratory of Exploration Technologies for Oil and Gas Resources, Yangtze University, Jingzhou 434023, China; 2. Department of Geochemistry, Yangtze University, Jingzhou 434023, China

Received date: 2009-04-06

  Revised date: 2009-05-28

  Online published: 2009-10-10

摘要

通过对吐哈盆地23个原油样品进行轻烃组分、Mango参数和成熟度等研究,认识到原油富含环烷烃,直链烷烃含量低,以陆源有机质为主;甲基环己烷指标(MCH\|I)指示出原油的干酪根类型为Ⅲ型;N61/N51值和(N61+N51)/(P2+P3+ N2)值等不同结构类型轻烃化合物的比值显示原油属于陆相油;C7化合物组成中甲基环己烷>50%,二甲基环戊烷<9%,正庚烷<40%,是煤成油和混源油的特征;根据石蜡指数和庚烷值认为吐哈盆地原油属正常原油,原油生成时最大温度介于91.16~102.22℃之间。

本文引用格式

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

Abstract

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℃.

参考文献

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