Facies analysis and distribution of Late Palaeogene deep-water massive sandstones in submarine-fan lobes, NW Borneo,Geological Journal

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Facies analysis and distribution of Late Palaeogene deep-water massive sandstones in submarine-fan lobes, NW Borneo
Geological Journal ( IF 1.4 ) Pub Date : 2022-08-08 , DOI: 10.1002/gj.4553
Muhammad Jamil _{1,

2} , Numair Ahmed Siddiqui ₁ , Muhammad Usman _{3,

4} , Ali Wahid ₅ , Muhammad Umar ₆ , Nisar Ahmed ₁ , Izhar Ul Haq ₁ , Mohamed A. K. El‐Ghali ₇ , Qazi Sohail Imran ₁ , Abdul Hadi Abd Rahman ₁ , Shiqi Zhang ₃

Affiliation

Deep-water massive sandstones (DWMS) are characterized by large volumes of sand accumulations which are considered as potential reservoir intervals in deep-marine environments. Lithological variations and bed thickness statistics are used to interpret the distribution of massive sandstones in a deep-marine fan-lobe system. These massive sandstones are interpreted based on lithological heterogeneities and detailed facies analysis in seventeen exposed sections of the Late Palaeogene deposits in Sabah, NW Borneo. Sedimentary logs containing details of lithology textures and structures were used to recognize nine sedimentary facies of DWMS. These lithofacies were then grouped into three sedimentary facies associations: (1) massive facies association with basal part of turbiditic Bouma sequence, (2) massive facies association having soft-sediment deformation structures, and (3) massive facies association with erosional features. The facies analysis portrays inner to middle submarine fan deposition and was later applied to reconstruct the distribution of a channel-lobe complex. Individual sandstone bed thicknesses vary from 1 m to more than 8 m and the number of massive sandstones in submarine lobes range from less than 10% to more than 50%. The thicknesses of massive sandstones in channels are more than 8 m, whereas distal lobes have thicknesses from 1–2 m only. These sandstones are concentrated in channels, proximal and medial lobe settings that can also be verified from calculating the average of all maximum thickness of massive sand intervals that is, 8.91 m. The lithological heterogeneities and the processes associated with the deposition of these massive sandstones are vital for potential hydrocarbon reservoirs in the deep-marine environments around the globe.

中文翻译：

婆罗洲西北部海底扇叶晚古近纪深水块状砂岩相分析及分布

深水块状砂岩（DWMS）的特点是大量的砂堆积，被认为是深海环境中的潜在储层层段。岩性变化和层厚统计数据用于解释深海扇叶系统中块状砂岩的分布。这些块状砂岩的解释基于婆罗洲西北部沙巴州晚期古近纪沉积物的 17 个暴露部分的岩性非均质性和详细的相分析。包含岩性纹理和结构细节的沉积测井用于识别 DWMS 的九个沉积相。然后将这些岩相分为三个沉积相组合：（1）块状相组合与浊积Bouma序列的基底部分，(2)具有软沉积变形构造的块状相组合，(3)具有侵蚀特征的块状相组合。相分析描绘了从内部到中海底扇沉积，后来被应用于重建河道-叶复合体的分布。单个砂岩层厚度从 1 m 到 8 m 以上不等，海底叶瓣中块状砂岩的数量从不到 10% 到超过 50% 不等。河道中块状砂岩的厚度超过 8 m，而远端叶瓣的厚度仅为 1-2 m。这些砂岩集中在河道、近端和中叶设置中，也可以通过计算块状砂层段的所有最大厚度的平均值来验证，即 8.91 m。

更新日期：2022-08-08

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