Boimarker Types and Geochemical Significance of Crude Oils in Western Depression, Liaohe Basin
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摘要: 原油的生物标志物组合特征可提供油气来源、成熟度、次生改造程度等多方面的重要信息，是油气成因分析和油源对比的有效工具.利用原油的生物标志物类型及其组合特征分析地球化学意义，通过生物降解作用的研究和原油生物标志物组合的判断，对稠油的来源进行成因分析，研究认为：辽河盆地不同地区各类生物标志物的组合及正构烷烃和异戊间二烯的分布特征，反映研究区发育母质输入、成熟度和生物降解程度明显不同的两种类型的原油，即富4-甲基甾烷型和富伽马蜡烷型原油，分别来源于沙三段和沙四段源岩.Abstract: Based on the research of biomarker combined characteristics, oil and gas source, maturity and degree of secondary reconstruction could be discussed which is the effective method to analyses hydrocarbon origin, genesis of petroleum and oil-source correlation. By making the most of biomarker types and combined characteristics, the geochemical significance will be researched. Oil-source correlation had been studied by becteria degradation and biomarker combined characteristics. The distribution of n-alkanes and isoprene shows that various types of crude oil are developed. That is, two main quite different crude oils are developed which are rich in 4-methylstane and rich in gamma-waxy in the study area. The two different crude oils come from Sha 3 and Sha 4 respectively.
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Key words:
- Liaohe basin /
- biomarker /
- oil-source correlation /
- becteria degradation /
- geochemistry /
- petroleum geology
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图 1 辽河盆地原油甾烷构成三角图
Fig. 1. Crude oil sterane constitution triangular figure in the Western depression, Liaohe basin
图 2 辽河盆地西部凹陷原油和生油岩C29甾烷20S/(S+R)与C29甾烷ββ/(ββ+αα)(a)及Ts/Tm(b)的关系
Fig. 2. The relationship between C29 sterane 20S/(S+R) and C29 sterane ββ/(ββ+αα)(a) as well as Ts/Tm (b) in the Western depression, Liaohe basin
图 3 辽河盆地西部凹陷原油和生油岩C27重排甾烷与4-甲基甾烷/(4-甲基甾烷+C29甾烷ααR)的关系
Fig. 3. The relationship between crude oil and source rock C27 rearranged sterane and 4-methylsterane/ (4-methylsterane+C29 sterane ααR) in the Western depression, Liaohe basin
图 4 辽河盆地西部凹陷未成熟油甾萜生物标志物分布及其与沙四段源岩的对比
Fig. 4. The distribution of immature crude steroid terpene biomarker and Sha 4 oil-source correlation in the Western Depression, Liaohe Basin
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