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首页> 美国卫生研究院文献>Heliyon >Depositional facies sequence stratigraphy and reservoir potential of the Eocene Nanka Formation of the Ameki Group in Agu-Awka and Umunya southeast Nigeria
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Depositional facies sequence stratigraphy and reservoir potential of the Eocene Nanka Formation of the Ameki Group in Agu-Awka and Umunya southeast Nigeria

机译：Ameki集团Agu-Awka和UmunyaSouthteast Nigeria的Ameki集团的沉积相序列地层和储层潜力

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摘要

A sedimentological investigation was carried out in Agu-Awka and Umunya localities to interpret the facies, depositional environment, sequence stratigraphy, reservoir potential, and architecture of the outcropping Eocene Nanka Formation of the Ameki Group in southeast Nigeria. Petrographic analysis reveals that the sediments are composed of predominantly subangular to subrounded recycled quartz grains with a minor amount of rock fragments. It indicates that the sediments are texturally submature and mineralogically mature. Lithofacies analysis indicates that the formation is composed of fine to coarse-grained, trough and planar cross-bedded sandstone with clay-drape units, interpreted to be a subtidal bar facies, and a minor mudstone interval with sand to muddy heterolith interpreted to be a tidal mudflat facies. This suggests that the formation is of mixed environments, such as a tidally influenced high-energy fluvial and low-energy marsh to lagoonal settings. The lower sand unit of the subtidal bar facies (fine to coarse-grained cross-bedded sandstone with clay-drape) represents a highstand systems tract. The sharp base sandy heterolith lithofacies that forms the upper unit of the subtidal facies, and the overlying tidal mudflat facies that comprises a bedded mudstone and overlying wave rippled sandy heterolith intervals represent a transgressive systems tract. The reservoir quality of the sandstone facies is predicted to be moderate to good based on textural statistical analysis. The various relationships of the sedimentological parameters of the outcrops revealed by this study may assist and contribute to the prediction and understanding of the reservoir stratigraphic heterogeneity and properties of the subsurface depositional facies of the Nanka Formation.
机译：Agu-Awka和Umunya地区进行了沉积学调查，以解释尼日利亚东南部的Ameki集团的露节宫内节育器的面部，沉积环境，序列地层，水库势和建筑。岩体分析表明，沉积物是主要的中间与​​次间回收的石英粒子，具有少量岩石碎片。它表明沉积物是纹理性淹没和矿物学成熟。锂外分析表明，该地层由粗粒，槽和平面横床砂岩与粘土悬垂单元的良好组成，被解释为对阴性棒相，以及带有沙子的少数泥岩间隔，泥泞的异味被解释为a潮汐泥板相。这表明该形成是混合环境，例如整个影响的高能量河流和低能量沼泽到LAGOONAL环境。阴性杆相的下砂单元（与粘土覆盖的精细粗粒细胞碎片砂岩）代表了高级系统的道路。形成阴影面的上部单元的锋利的基础砂质岩散，以及覆盖的潮汐泥板相板，包括床垫和覆盖波的覆盖物砂质异常间隔代表了一个近级系统的散网。基于纹理统计分析，预计砂岩相的水库质量预计将是中等的。本研究揭示的露头的沉积学参数的各种关系可以帮助并有助于预测和理解南卡形成的地下沉积相的储层地层异质性和性能。

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