油气包裹体分子组成的热释—色谱—质谱分析

陈彦鄂; 张志荣; GREENWOODPaul

doi:10.11781/sysydz202105915

油气包裹体分子组成的热释—色谱—质谱分析

doi: 10.11781/sysydz202105915

陈彦鄂^{1, 2,},
张志荣^{1, 2},
GREENWOODPaul³

1.
中国石化油气成藏重点实验室, 江苏无锡 214126
2.
中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126
3.
西澳大学, 澳大利亚珀斯 WA6009

详细信息

作者简介:
陈彦鄂(1994-), 女, 硕士, 从事油气地球化学研究。E-mail: chenyane.syky@sinopec.com

中图分类号: TE135
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出版历程
- 收稿日期: 2021-05-31
- 修回日期: 2021-07-12
- 刊出日期: 2021-09-28

Pyrolysis-gas chromatography-mass spectrometry analyses of oil-bearing fluid inclusions composition

1.
Key Laboratory of Petroleum Accumulation Mechanisms, SINOPEC, Wuxi, Jiangsu 214126, China
2.
Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China
3.
University of Western Australia, Perth, WA 6009, Australia

摘要

摘要: 油气包裹体分子组成对油气成藏研究来说具有较大的应用价值。由于油气包裹体中所含物质的量不能满足常规化学仪器分析的要求，因此通常需要研发定制仪器且实现难度较大，从而限制了该技术的推广应用。采用热释-色谱-质谱法对澳大利亚Halibut油田原油的人工合成包裹体、澳大利亚Jabiru油田和塔河油田油气包裹体样品进行了烃类组成分析。正构烃类，单、双以及三环芳烃等组分能够被有效检测到，检出化合物的最高碳数超过了C₃₀。该方法与其他手段分析结果具有较高的可比性，Jabiru油田包裹体热释-色谱-质谱分析与包裹体分子组成离线分析（MCI，Molecular Composition of Inclusion）的结果对比显示，芳烃化合物的成熟度参数仅有微小的差异，两种方法获得的包裹体烃类成熟度均明显低于产出原油，印证了油气流体在被捕获形成包裹体后能够避免后期改造的影响。热释法作为一种通用的常规方法，同样适用于油气包裹体的分析，相比于其他手段，该方法更加便捷。
- 油气包裹体 /
- 生物标志物 /
- 热释法 /
- 色谱—质谱
Abstract: The molecular compositions of oil-bearing fluid inclusions (FIs) are valuable for the research of oil and gas accumulation; however, due to the very trace amount of materials included, the requirements of commercial instruments cannot be satisfied and thus custom designed instruments were needed for this method, which is difficult to be achieved and the application for the molecular composition of FIs have been limited. In this paper, three samples of oil-bearing FIs were analyzed by pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS) to obtain their hydrocarbon composition. The first sample was a synthetic inclusion prepared by the occlusion of a small amount of crude oil from the Halibut oil field, the second sample was from Australian Jabiru oil field and the third sample was collected from the Tahe oil field in the northwestern China. A diverse range of aliphatic compounds, including n-alkanes, mono-, di- and tricyclic aromatic hydrocarbons and other components have been successively detected from these materials of which, the n-alkanes were monitored up to carbon numbers over C₃₀. Also, the results showed that the method introduced here gave comparable molecular characteristics with data obtained from other traditional methods. The mature degree calculated from Py-GC-MS is very close to that of MCI method. However, it is also notable that the thermal maturity parameters calculated from the results of inclusion analysis were much lower than those of crude oil, indicating modification caused by late-stage alteration to oils in reservoir. As a conventional and easy performed analytical method specially designed for the degradation of macromolecule, the Py-GC-MS demonstrated here is also suitable for the analysis of FIs.
- oil-bearing fluid inclusion /
- biomarkers /
- pyrolysis /
- GC-MS

HTML全文

图 1 澳大利亚Halibut油田原油人工包裹体组分对比

*为柱流失等未知物；CH.环己烷；MCH.甲基环己烷；B.苯；T.甲苯；C₂-B.邻+间+对二甲苯；N.萘；C_n.正构烷烃；iC_n.异构烷烃；Pr.姥鲛烷；Ph.植烷

Figure 1. Hydrocarbon composition of synthetic inclusion from Halibut oil field, Australia

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图 2 澳大利亚Halibut油田Halibut-1A人工包裹体以及原油中正构烷烃和类异戊二烯化合物相对含量对比

正方形数据为Halibut-1A人工包裹体；菱形数据为原油；连线为正构烷烃；散点为类异戊二烯

Figure 2. Relative content of n-alkene and isoprene compounds of synthetic inclusions and crude oil from Halibut oil field, Australia

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图 3 澳大利亚Jabiru油田Jabiru包裹体热释法色谱—质谱分析结果

Figure 3. Py-GC-MS of inclusions from Jabiru oil field, Australia

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图 4 澳大利亚Jabiru油田包裹体热释法色谱—质谱分析及芳烃化合物质量色谱图

MN.甲基萘；EN.乙基萘；DMB.二甲基萘；TMN.三甲基萘；P.菲；MP.甲基菲

Figure 4. PAHs chromatograms of petroleum released from fluid inclusion (Jabiru oil field, Australia) with Py-GC-MS

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图 5 澳大利亚Jabiru油田包裹体及原油的成熟度参数对比

Ph.植烷，Pr.姥鲛烷，R_c.镜质体反射率，CPI.碳优势指数，MPI.甲基菲，TMNR.三甲基萘指数，DMNR.二甲基萘指数，MNR.甲基萘指数；蓝色实线为Jabiru原油；绿色点虚线为热释法色谱—质谱法；红色短划线为包裹体离线MCI法，MCI法以及原油分析结果引自参考文献[13]。

Figure 5. Maturity parameters for inclusions and crude oil from Jabiru oil field, Australia

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图 6 塔里木盆地T901井包裹体热释法色谱—质谱分析结果

化合物命名与前文相同。

Figure 6. Py-GC-MS of inclusions from well T901, Tarim Basin

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