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Diagenetic controls on the reservoir quality of Neogene sandstones in the offshore area of the Bengal Basin, Bangladesh
Geological Journal ( IF 1.4 ) Pub Date : 2022-08-29 , DOI: 10.1002/gj.4572 M. Julleh Jalalur Rahman 1 , Maria Mutti 2 , Ming Ma 3 , Guojun Chen 3 , Waheda Akhter 1 , Shirin Akter 1 , Md.Sakawat Hossain 1 , Md.Rabiul Awal Khan 4
Geological Journal ( IF 1.4 ) Pub Date : 2022-08-29 , DOI: 10.1002/gj.4572 M. Julleh Jalalur Rahman 1 , Maria Mutti 2 , Ming Ma 3 , Guojun Chen 3 , Waheda Akhter 1 , Shirin Akter 1 , Md.Sakawat Hossain 1 , Md.Rabiul Awal Khan 4
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The Neogene sandstones offer hydrocarbon reservoirs in the offshore area of the Bay of Bengal (Bangladesh), but their reservoir quality is not well known. Understanding the impact of depositional and diagenetic controls on reservoir quality is crucial to hydrocarbon exploration and production in reservoir sandstones. This study aims to investigate the depositional and diagenetic controls on reservoir quality of the Neogene Surma Group from the Sangu Gas Field (the only offshore gas field), in the Bay of Bengal, Bangladesh using a combination of petrographical, petrophysical, X-ray diffraction, scanning electron microscope fitted with energy dispersive spectra and core analysis data. Diagenetic modifications to the sandstones include mechanical and ductile grain compaction followed by clay cementation (dominantly chlorite, illite–smectite and minor kaolinite), poikilotopic calcite cement and subordinate amounts of quartz cement, as well as partial dissolution of feldspars and lithic fragments. Sandstones with primary porosities ≥20% have average intergranular volume value of 33%, although permeability in most sections of the reservoir falls below 8–10 mD. There has also been localized creation of secondary porosity due to dissolution. The average intergranular porosity lost by compaction is 14% (ranges from 3% to 37%), and the average porosity lost by cementation is 10% (ranges from 3% to 37%). This study shows that the reservoir quality is predominantly controlled by depositional environment (ductile grain supply, clay content), a diagenetic processes (compaction followed by clay cement and early to intermediate poikilotopic calcite cement) and will provide insights into the reservoir quality evaluation in the offshore areas of the Bengal Basin.
中文翻译：
孟加拉盆地近海新近系砂岩储层质量成岩控制
新近纪砂岩在孟加拉湾（孟加拉国）的近海地区提供油气藏，但其储层质量尚不为人所知。了解沉积和成岩控制对储层质量的影响对于储层砂岩油气勘探和生产至关重要。本研究旨在结合岩石学、岩石物理、X 射线衍射，研究孟加拉湾 Sangu 气田（唯一的海上气田）新近纪 Surma 组储层质量的沉积和成岩控制。 ，扫描电子显微镜配备能量色散光谱和岩心分析数据。砂岩的成岩作用包括机械和韧性颗粒压实，然后是粘土胶结（主要是绿泥石，伊利石-绿土和少量高岭石）、异质方解石胶结物和少量石英胶结物，以及长石和岩屑碎片的部分溶解。原生孔隙度≥20% 的砂岩平均粒间体积值为 33%，尽管储层大部分部分的渗透率低于 8-10 mD。由于溶解，还局部产生了次生孔隙。压实损失的平均粒间孔隙度为 14%（范围为 3% 至 37%），胶结损失的平均孔隙度为 10%（范围为 3% 至 37%）。本研究表明，储层质量主要受沉积环境（韧性颗粒供应、粘土含量）控制，
更新日期：2022-08-29
中文翻译：
孟加拉盆地近海新近系砂岩储层质量成岩控制
新近纪砂岩在孟加拉湾（孟加拉国）的近海地区提供油气藏，但其储层质量尚不为人所知。了解沉积和成岩控制对储层质量的影响对于储层砂岩油气勘探和生产至关重要。本研究旨在结合岩石学、岩石物理、X 射线衍射，研究孟加拉湾 Sangu 气田（唯一的海上气田）新近纪 Surma 组储层质量的沉积和成岩控制。 ，扫描电子显微镜配备能量色散光谱和岩心分析数据。砂岩的成岩作用包括机械和韧性颗粒压实，然后是粘土胶结（主要是绿泥石，伊利石-绿土和少量高岭石）、异质方解石胶结物和少量石英胶结物，以及长石和岩屑碎片的部分溶解。原生孔隙度≥20% 的砂岩平均粒间体积值为 33%，尽管储层大部分部分的渗透率低于 8-10 mD。由于溶解，还局部产生了次生孔隙。压实损失的平均粒间孔隙度为 14%（范围为 3% 至 37%），胶结损失的平均孔隙度为 10%（范围为 3% 至 37%）。本研究表明，储层质量主要受沉积环境（韧性颗粒供应、粘土含量）控制，
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