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Understanding organic matter supply in the Eocene to Miocene Lark Formation, Danish North Sea
International Journal of Coal Geology ( IF 5.6 ) Pub Date : 2024-07-20 , DOI: 10.1016/j.coal.2024.104575
Zhiheng Zhou , Henrik Ingermann Petersen , Niels Hemmingsen Schovsbo , Arka Rudra , Hamed Sanei

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.

中文翻译:


了解丹麦北海始新世至中新世百灵鸟组的有机质供应



区域沉积环境和气候条件的变化凸显了云雀组的重要性,这些变化是新生代晚期沉积物流入丹麦北海盆地的特征。这项研究标志着对云雀组沉积有机质的首次系统调查。收集并分析了丹麦北海 7 口井的 391 个钻屑。所有 391 个样品均通过热解地球化学进行了分析,其中 38 个样品使用反射光进行了岩相学检查,以记录显微组分成分。这使得能够调查丹麦北海盆地从始新世晚期到中中新世有机质分布和性质的时空变化。结果表明,有机质主要由 III 型干酪根组成,热指标显示其热不成熟(T < 430 °C,平均 HRo = 0.3%,平均 R/G = 0.51)。干酪根主要由腐泥岩(丰富)、脂质岩(含量较少)和惰质岩(痕量)显微组分组成。
更新日期:2024-07-20
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