Ediane B. da Silva, Helio J.P. Severiano Ribeiro, Eliane Soares de Souza
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引用次数: 0
摘要
这项研究旨在调查白垩纪大洋缺氧事件(OAEs)与巴西赤道边缘盆地(BEM)源岩之间的相关性。众所周知,这些源岩,尤其是来自仙人掌-都龙纪的源岩,含有大量的总有机碳(TOC),具有巨大的碳氢化合物潜力。主要研究重点是全球缺氧事件(如 OAE-1b、OAE-1d 和 OAE-2)如何影响整个 BEM 盆地的沉积环境和有机物类型,这些盆地包括 Foz do Amazonas、Pará-Maranhão、Barreirinhas、Ceará 和 Potiguar。主要结果表明,缺氧期与这些盆地富含有机质沉积物的积累之间存在密切联系。Foz do Amazonas 盆地的主要特征是源于陆地的角质(III 型),而塞阿拉和波蒂瓜尔盆地则显示源于海洋的角质(I 型和 II 型),这与缺氧时期的全球生产力模式一致。这些角质类型的变化反映了受海平面变化和营养物质流入影响的沉积环境的差异。研究得出结论,OAEs 对 BEM 盆地的有机物保存和碳氢化合物生成产生了重大影响。研究结果有助于人们更广泛地了解白垩纪 OAEs 如何塑造了赤道大西洋边缘的地球化学和沉积过程,突出了在这些地区进一步勘探石油和天然气的潜力。
Assessing the geochemical correlation between petroleum source rocks in the Brazilian Equatorial margin basins and global oceanic anoxic events
This research aims to investigate the correlation between the Cretaceous Oceanic Anoxic Events (OAEs) and the source rocks of the Brazilian Equatorial Margin (BEM) basins. These source rocks, particularly from the Cenomanian-Turonian interval, are known to contain high levels of Total Organic Carbon (TOC) and exhibit significant hydrocarbon potential. The principal focus is on how global anoxic events, such as OAE-1b, OAE-1d, and OAE-2, influenced the depositional environments and organic matter types across the BEM basins, which include Foz do Amazonas, Pará-Maranhão, Barreirinhas, Ceará, and Potiguar. Key results indicate a strong correlation between periods of anoxia and the accumulation of organic-rich sediments in these basins. The Foz do Amazonas Basin features predominantly terrestrial-derived kerogen (Type III), while the Ceará and Potiguar basins show marine-derived kerogen (Type I and II), aligning with global productivity patterns during anoxic events. These variations in kerogen type reflect differences in depositional environments influenced by sea-level changes and nutrient influx. The research concludes that the OAEs significantly impacted organic matter preservation and hydrocarbon generation in the BEM basins. The study's findings contribute to the broader understanding of how Cretaceous OAEs shaped the geochemical and sedimentary processes in equatorial Atlantic margins, highlighting the potential for further oil and gas exploration in these regions.
期刊介绍:
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