Abstract Lacustrine and marine crude oils from different off-shore Brazilian basins were analyzed using a 7.2 Tesla LTQ FTICR-MS instrument. The samples were analyzed via electrospray ionization in the negative ion mode focusing on the polar compounds, i.e., nitrogen-, sulfur-, and oxygen-containing (NSO) compounds. We also employed a combination of other geochemical methods, such as GC-FID and GC-MS analyses, to characterize and assess the depositional environments of the different oil families. The results indicate that lacustrine oils tend to be enriched in Nx compounds, while marine oils show preference for Ox compounds. The dominant heteroatomic classes in crude oils are N1, followed by O1, O2, and N1O1 with remarkable differences in their distributions between marine and lacustrine, strongly suggesting the control by the kerogen type of the heteroatomic compounds found in these crude oils. Considerable differences in the DBE distribution of the main classes analyzed between the crude oils allowed an efficient geochemical characterization regarding their origin. The use of negative ESI FTICR-MS as a geochemistry tool can provide additional information beyond that obtained with currently employed geochemical methods, resulting in the full comprehension of crude oil composition.

中文翻译：

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使用负离子电喷雾傅里叶变换离子回旋共振质谱 (ESI FTICR-MS) 对来自巴西近海沉积盆地的湖相和海相油进行地球化学表征

摘要 使用 7.2 Tesla LTQ FTICR-MS 仪器分析了来自巴西不同近海盆地的湖相和海洋原油。在负离子模式下通过电喷雾电离分析样品，重点分析极性化合物，即含氮、硫和氧 (NSO) 化合物。我们还结合了其他地球化学方法，例如 GC-FID 和 GC-MS 分析，来表征和评估不同油族的沉积环境。结果表明，湖相油往往富含 Nx 化合物，而海洋油则偏爱 Ox 化合物。原油中占主导地位的杂原子类别是 N1，其次是 O1、O2 和 N1O1，它们在海相和湖相之间的分布存在显着差异，强烈建议干酪根类型控制这些原油中发现的杂原子化合物。原油之间分析的主要类别的 DBE 分布的显着差异允许对其来源进行有效的地球化学表征。使用负 ESI FTICR-MS 作为地球化学工具可以提供超出目前使用的地球化学方法获得的额外信息，从而全面了解原油成分。