Understanding organic matter supply in the Eocene to Miocene Lark Formation, Danish North Sea

IF 5.6 2区工程技术 Q2 ENERGY & FUELS International Journal of Coal Geology Pub Date : 2024-07-20 DOI:10.1016/j.coal.2024.104575

Zhiheng Zhou, Henrik Ingermann Petersen, Niels Hemmingsen Schovsbo, Arka Rudra, Hamed Sanei

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Abstract

The significance of the Lark Formation is underscored by the variations in regional depositional environments and climatic conditions that characterized the late Cenozoic sedimentary flux into the Danish North Sea basin. This study marks the first systematic investigation of sedimentary organic matter in the Lark Formation. A total of 391 drill cuttings from 7 wells in the Danish North Sea were collected and analyzed. All 391 samples were analyzed by pyrolysis geochemistry, and thirty-eight were examined petrographically using reflected light to document maceral composition. This allowed the investigation into spatial and temporal variations in the distribution and properties of organic matter within the Danish North Sea Basin from the latest Eocene to the Middle Miocene. The results reveal that the organic matter comprises primarily Type III kerogen and is thermally immature, as indicated by thermal indicators (T < 430 °C, mean HRo = 0.3%, mean R/G = 0.51). The kerogen is predominantly composed of huminite (abundant), liptinite (less abundant), and inertinite (trace quantity) macerals.

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了解丹麦北海始新世至中新世云雀地层的有机质供应情况

区域沉积环境和气候条件的变化凸显了云雀地层的重要性，而这些变化正是晚新生代沉积物流入丹麦北海盆地的特征。这项研究是对云雀地层沉积有机物的首次系统调查。共收集并分析了来自丹麦北海 7 口井的 391 份钻屑样品。对所有 391 个样本都进行了热解地球化学分析，并利用反射光对 38 个样本进行了岩石学检查，以记录宏观组成。这样就可以研究丹麦北海盆地从最近的始新世到中新世有机物质分布和性质的空间和时间变化。研究结果表明，有机质主要由 III 型角质组成，热指标（T < 430 °C、平均 HRo = 0.3%、平均 R/G = 0.51）表明其热度不成熟。角质主要由腐植质（含量丰富）、尖晶石（含量较少）和惰性石（微量）大颗粒组成。

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来源期刊

International Journal of Coal Geology 工程技术-地球科学综合

CiteScore

11.00

自引率

14.30%

发文量

145

审稿时长

38 days

期刊介绍： The International Journal of Coal Geology deals with fundamental and applied aspects of the geology and petrology of coal, oil/gas source rocks and shale gas resources. The journal aims to advance the exploration, exploitation and utilization of these resources, and to stimulate environmental awareness as well as advancement of engineering for effective resource management.