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 : 2024-12-21 DOI:10.1016/j.jafrearsci.2024.105522

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

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引用次数: 0

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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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.