在色谱方法优化后,使用标记物和生物标记物对不同沉积古环境进行综合评估
Flávia Lima E Cima Miranda1, Diego Nery do Amaral1,2, José Roberto Cerqueira1
1Programa de Pós graduação Geoquímica: Petróleo e Meio Ambiente, Instituto de Geociências, Universidade Federal da Bahia, Salvador 40170-290, BA, Brazil.
ACS omega
|September 23, 2024
概括
这项研究优化了色谱方法来分析来自巴西,委内瑞拉和哥伦比亚的原油中的标记物和生物标记物. 地化学分析揭示了这些石油样品的不同沉积环境和有机物来源.
科学领域:
- 地质化学 地质化学
- 有机地化学 有机地化学
- 石油地质化学 石油地质化学
背景情况:
- 原油的表征对于理解石油系统至关重要.
- 含化合物和生物标志物是石油原产地和成熟度的有价值指标.
- 不同的古老环境可以显著影响石油的地化学特征.
研究的目的:
- 优化色谱方法来分析原油中的标记物和生物标记物.
- 来自巴西,委内瑞拉和哥伦比亚的原油样本进行综合地质化学评估.
- 根据其沉积环境和有机物来源来区分油.
主要方法:
- 优化用于识别和定量标记物和生物标记物的染色学方法.
- 应用分析标准,认证参考材料和生物标记物识别的保留指数.
- 使用诸如UCM,Pr/n-C17,Ph/n-C18,炭醇,[b]炭醇,三环/霍比率,固醇和主要成分分析 (PCA) 等参数进行地化学解释.
主要成果:
- 所有分析的油都被发现是非生物降解的.
- 来自巴西和委内瑞拉的油原产于无氧条件下,而哥伦比亚的油原产于双氧条件下.
- 证据表明,藻类在所有样本中对素形成有所贡献,不同的n-alkane分布表明淡水湖 (巴西) 或海洋/盐水湖 (哥伦比亚,委内瑞拉) 的起源.
- 通过PCA成功地根据其沉积环境使用碳素和三环/霍比率对样品进行分组.
结论:
- 综合地质化学方法有效地根据原油沉积环境区分原油.
- 标记物和生物标记物,以及化学测量工具,为石油起源和古环境条件提供了强大的洞察力.
- 这项研究提供了一个精细的方法论,用于石油源相关性和古老环境重建.
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