Biomarker geochemistry and oil-oil correlation from reservoir unit oils of the Sokor-1 Formation, Fana low uplift, Termit Basin, southeastern Niger

IF 2.2 4区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of African Earth Sciences Pub Date : 2025-03-01 Epub Date: 2024-12-21 DOI:10.1016/j.jafrearsci.2024.105522

M.A.I. Ari , M.E. Nton , M. Harouna

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Abstract

The Termit Basin, a Cretaceous-Paleogene rift in southeastern Niger, and other rift basins of the West and Central African Rift System are widely studied using traditional oil-oil correlation methods. These methods face challenges in subjectivity, large dataset processing, and distinguishing geochemically similar oils due to multiple source rocks and geological complexity.

This research aims to improve the understanding of crude oil types, sources, depositional environments, and thermal maturity stages of oil organic precursors by examining their molecular compositions. It also seeks to identify the most suitable biomarkers for oil-oil correlation studies. Gas chromatography (GC), gas chromatography-mass spectrometry (GC-MS), and chemometric methods were used in this study.

Crude oil samples were classified as paraffinic-naphthenic, aromatic-intermediate, and aromatic-asphaltene oils. Statistical analyses identified steranes and terpanes as the most suitable biomarkers for oil-oil correlation studies, with three distinct oil groups. Thermal maturity indicators suggest that the precursor organic materials were in the early to mid-maturity stages.

These findings reveal the potential of extending the oil-oil correlation studies in the Termit Basin and other rift basins of the WCARS to enhance understanding of source rocks contributing to proven hydrocarbons, reservoir connectivity, and hydrocarbon migration pathways.

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尼日尔东南部Termit盆地Fana低凸起Sokor-1组储层单元油生物地球化学特征及油气对比

利用传统的油气对比方法对尼日尔东南部白垩系-古近系裂谷Termit盆地以及西非和中非裂谷系的其他裂谷盆地进行了广泛的研究。这些方法面临着主观性、大数据处理以及由于多源岩和地质复杂性而区分地球化学相似油的挑战。本研究旨在通过研究原油有机前体的分子组成，提高对原油类型、来源、沉积环境和原油有机前体热成熟阶段的认识。它还寻求确定最适合油-油相关性研究的生物标志物。本研究采用气相色谱（GC）、气相色谱-质谱（GC- ms）和化学计量学方法。原油样品分为烷烃-环烷油、芳烃-中间体油和芳烃-沥青质油。统计分析发现甾烷和萜烷是油-油相关性研究中最合适的生物标志物，具有三种不同的油组。热成熟度指标表明前驱体有机质处于早、中成熟阶段。这些发现揭示了在Termit盆地和WCARS的其他裂谷盆地扩展油气对比研究的潜力，以增强对已探明油气、储层连通性和油气运移路径的烃源岩的理解。

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来源期刊

Journal of African Earth Sciences 地学-地球科学综合

CiteScore

4.70

自引率

4.30%

发文量

240

审稿时长

12 months

期刊介绍： The Journal of African Earth Sciences sees itself as the prime geological journal for all aspects of the Earth Sciences about the African plate. Papers dealing with peripheral areas are welcome if they demonstrate a tight link with Africa. The Journal publishes high quality, peer-reviewed scientific papers. It is devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be considered. Papers must have international appeal and should present work of more regional than local significance and dealing with well identified and justified scientific questions. Specialised technical papers, analytical or exploration reports must be avoided. Papers on applied geology should preferably be linked to such core disciplines and must be addressed to a more general geoscientific audience.