方案摘要
方案下载| 应用领域 | 石油/化工 |
| 检测样本 | 原油 |
| 检测项目 | 组成分析>烃族组成分析 |
| 参考标准 | 国标 |
Because biomarker concentrations decrease with increasing thermal maturity, light oils contain only a low concentration of detectable biomarkers, and in consequence require instrumentation of highest selectivity and sensitivity. The information of source, thermal maturity, and secondary alteration processes are furthermore often revealed by only subtle variations in the isomeric distribution of such trace components. GC-MS/MS using the Thermo Scientific TSQ Quantum XLS is the premier analytical method for the sensitive characterization of “molecular fossil” biomarkers in crude oil.
Due to the variety of geological conditions and ages under which oil was formed, every crude oil exhibits a unique biomarker fingerprint. Because of this, biological biomarkers are the most important hydrocarbon groups in petroleum because they can be used for chemical fingerprinting. Biomarkers reveal all or most of the original carbon skeleton of the original natural products.1,2 Relative to other hydrocarbon components petroleum biomarkers are more resistant to biodegradation but concentrations steadily decrease as petroleum matures. The information from biomarker analysis is used to determine the migration pathways from a source rock to the reservoir, for the correlation of oils in terms of oil-to-oil and oil-to-source rock, the source potential, ranking of the relative thermal maturity, as well as possible secondary alteration processes. Decisions for the commercial exploitation of a prospect are
based on that analytical background. Economics ultimately determine if a petroleum reservoir is further developed and finally brought to the market.3 Refinery chemists are mostly interested in how oil behaves when feeding the processes into marketable products. Analyses of petrochemical biomarkers also have been proven useful in the determination of petroleum-derived environmental contaminations.
Biomarkers found in crude oils, rocks and sediments, also referenced as “molecular fossils” in the literature, demonstrate few or even no changes from their former precursor compounds: terpenoids (isoprenoids) and steroids found in the cells of the originating living organisms.2,4
Biomarker concentrations in oils are low, typically in the low ppm and sub-ppm level in the presence of a highly complex petroleum hydrocarbon matrix. As the concentrations of biomarkers in petroleum decrease with thermal maturity, oils of high maturity exhibit particular analytical challenges with only low biomarker concentrations. Highly selective, fast and sensitive mass analyzers as high resolution or triple quadrupole GC/MS instruments are
common and required for meaningful biomarker analysis.
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