Is the offshore southern Tanzanian Basin an atypical igneous-sedimentary petroleum system?

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Marine Geophysical Research Pub Date : 2024-01-23 DOI:10.1007/s11001-023-09540-1
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Abstract

The northern region of the offshore southern Tanzania contains structurally controlled hydrocarbon discoveries. The Permo-Triassic, Jurassic, Cretaceous and Cenozoic source rocks are reported to have possibly charged the existing hydrocarbon reservoirs in the region. However, there is no a detailed record of possible heat sources that may have matured the reported source rocks. Additionally, focused academic research on the possibility of different petroleum traps in the area has also not been done before. This study has used conventional 2D seismic interpretation to reveal presence of several igneous intrusions in the study area. The revealed igneous intrusions include igneous dykes and sills present in the Cretaceous and Cenozoic parts of the studied stratigraphy. Together with the existing burial depth, the associated magmatic heat is interpreted to have facilitated maturation of the Cretaceous-Cenozoic source rocks in the region. This suggests that the offshore southern Tanzanian Basin contains an atypical petroleum system where source rock maturation did not entirely rely on burial temperature. The igneous intrusions have also created hydrocarbon migration pathways from different stratigraphic levels. This is reflected by fracturing of the immediate reservoir intervals and seal rocks above the mapped igneous dykes. The used seismic datasets have also allowed mapping of structural, stratigraphic and combination traps in the study area.

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坦桑尼亚南部近海盆地是一个非典型火成岩-沉积岩石油系统吗?
摘要 坦桑尼亚南部近海北部地区发现了受构造控制的碳氢化合物。据报道,二叠三叠纪、侏罗纪、白垩纪和新生代源岩可能是该地区现有油气储层的充气源。然而,对于可能使所报告的源岩成熟的热源,却没有详细的记录。此外,以前也没有对该地区不同石油陷阱的可能性进行过重点学术研究。本研究采用常规二维地震解释,揭示了研究区域存在多个火成岩侵入体。所揭示的火成岩侵入体包括白垩纪和新生代地层中的火成岩堤和岩屑。加上现有的埋藏深度,相关的岩浆热被解释为促进了该地区白垩纪-新生代源岩的成熟。这表明,坦桑尼亚盆地南部近海含有一个非典型石油系统,源岩的成熟并不完全依赖于埋藏温度。火成岩侵入体还创造了不同地层的碳氢化合物迁移路径。这反映在直接储集层层段的断裂以及所绘制的火成岩堤坝上方的封存岩上。使用地震数据集还可以绘制研究区域的构造、地层和组合陷阱图。
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来源期刊
Marine Geophysical Research
Marine Geophysical Research 地学-地球化学与地球物理
CiteScore
2.80
自引率
14.30%
发文量
41
审稿时长
>12 weeks
期刊介绍: Well-established international journal presenting marine geophysical experiments on the geology of continental margins, deep ocean basins and the global mid-ocean ridge system. The journal publishes the state-of-the-art in marine geophysical research including innovative geophysical data analysis, new deep sea floor imaging techniques and tools for measuring rock and sediment properties. Marine Geophysical Research reaches a large and growing community of readers worldwide. Rooted on early international interests in researching the global mid-ocean ridge system, its focus has expanded to include studies of continental margin tectonics, sediment deposition processes and resulting geohazards as well as their structure and stratigraphic record. The editors of MGR predict a rising rate of advances and development in this sphere in coming years, reflecting the diversity and complexity of marine geological processes.
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