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Clay Minerals in Interbedded Sandstones and Shales of the Miocene Surma Group, Sylhet Trough, Bengal Basin (northeastern Indian Plate): Implications for Future Hydrocarbon Exploration
Clays and Clay Minerals ( IF 2.0 ) Pub Date : 2022-06-28 , DOI: 10.1007/s42860-022-00189-2
Farida Khanam , M. Julleh Jalalur Rahman , Rashed Abdullah

Clay minerals are common constituents of the Miocene Surma Group reservoir rocks in the Sylhet Trough, Bengal Basin, and may exert significant controls on reservoir quality. The relationship between diagenetic clay minerals and reservoir quality in the petroliferous Sylhet Trough is poorly understood, however. The current study was aimed at the origin and diagenetic pattern of clay minerals in interbedded sandstones and shales using thin-section petrography, scanning electron microscopy (SEM), and X-ray diffraction (XRD), and understanding their diagenetic effects on reservoir quality. The results showed that the clay mineral cements in sandstones comprise mainly chlorite, illite/illite-smectite, and minor smectite and kaolinite. In the early diagenetic stage, clay rims and growth of vermiform kaolinite occur and partly occlude the pore throats. Deep burial effects include pore-filling, pore-lining, and grain-coating authigenic clays (mainly chlorite and illite). Diagenetic clay minerals and mechanical clay infiltration showed a systematic distribution in sandstones lying in the vicinity of sequence and parasequence boundaries. In a lowstand systems tract (LST), clay minerals within the sandstones commonly include mechanically infiltrated smectitic clays that eventually evolved to grain-coating chlorite and/or illite during the meso-diagenesis stage. The presence of clays/clay minerals has no significant impact upon reservoir quality of sandstones. The Surma Group shales are enriched in illite with significant proportions of chlorite and kaolinite and are likely to be mainly detrital, with diagenetic changes of smectite to illite.



中文翻译:

孟加拉盆地(印度东北部板块)Sylhet 槽中新世 Surma 群互层砂岩和页岩中的粘土矿物:对未来油气勘探的启示

粘土矿物是孟加拉盆地 Sylhet 槽中中新世 Surma 组储层岩石的常见成分,可能对储层质量发挥重要控制作用。然而,人们对含油气 Sylhet 槽中成岩粘土矿物与储层质量之间的关系知之甚少。本研究旨在利用薄片岩相学、扫描电子显微镜 (SEM) 和 X 射线衍射 (XRD) 研究互层砂岩和页岩中粘土矿物的成因和成岩模式,并了解其成岩作用对储层质量的影响。结果表明,砂岩中黏土矿物胶结物主要为绿泥石、伊利石/伊利石-蒙脱石,少量绿土和高岭石。早成岩阶段出现黏土边缘和蠕虫状高岭石的生长,部分堵塞孔喉。深埋效应包括孔隙充填、孔隙衬里和颗粒包覆的自生粘土(主要是绿泥石和伊利石)。成岩粘土矿物和机械粘土入渗在层序和准层序边界附近的砂岩中呈系统分布。在低位系统域 (LST) 中,砂岩中的粘土矿物通常包括机械渗透的蒙脱石粘土,这些粘土最终在中成岩阶段演化为颗粒覆盖的绿泥石和/或伊利石。粘土/粘土矿物的存在对砂岩的储层质量没有显着影响。苏尔玛组页岩富含伊利石,含有大量绿泥石和高岭石,可能主要为碎屑,绿土成伊利石的成岩作用。和颗粒涂层的自生粘土(主要是绿泥石和伊利石)。成岩粘土矿物和机械粘土入渗在层序和准层序边界附近的砂岩中呈系统分布。在低位系统域 (LST) 中,砂岩中的粘土矿物通常包括机械渗透的蒙脱石粘土,这些粘土最终在中成岩阶段演化为颗粒覆盖的绿泥石和/或伊利石。粘土/粘土矿物的存在对砂岩的储层质量没有显着影响。苏尔玛组页岩富含伊利石,含有大量绿泥石和高岭石,可能主要为碎屑,绿土成伊利石的成岩作用。和颗粒涂层的自生粘土(主要是绿泥石和伊利石)。成岩粘土矿物和机械粘土入渗在层序和准层序边界附近的砂岩中呈系统分布。在低位系统域 (LST) 中,砂岩中的粘土矿物通常包括机械渗透的蒙脱石粘土,这些粘土最终在中成岩阶段演化为颗粒覆盖的绿泥石和/或伊利石。粘土/粘土矿物的存在对砂岩的储层质量没有显着影响。苏尔玛组页岩富含伊利石,含有大量绿泥石和高岭石,可能主要为碎屑,绿土成伊利石的成岩作用。成岩粘土矿物和机械粘土入渗在层序和准层序边界附近的砂岩中呈系统分布。在低位系统域 (LST) 中,砂岩中的粘土矿物通常包括机械渗透的蒙脱石粘土,这些粘土最终在中成岩阶段演化为颗粒覆盖的绿泥石和/或伊利石。粘土/粘土矿物的存在对砂岩的储层质量没有显着影响。苏尔玛组页岩富含伊利石,含有大量绿泥石和高岭石,可能主要为碎屑,绿土成伊利石的成岩作用。成岩粘土矿物和机械粘土入渗在层序和准层序边界附近的砂岩中呈系统分布。在低位系统域 (LST) 中,砂岩中的粘土矿物通常包括机械渗透的蒙脱石粘土,这些粘土最终在中成岩阶段演化为颗粒覆盖的绿泥石和/或伊利石。粘土/粘土矿物的存在对砂岩的储层质量没有显着影响。苏尔玛组页岩富含伊利石,含有大量绿泥石和高岭石,可能主要为碎屑,绿土成伊利石的成岩作用。砂岩中的粘土矿物通常包括机械渗透的蒙脱石粘土,这些粘土最终在中成岩阶段演变成颗粒覆盖的绿泥石和/或伊利石。粘土/粘土矿物的存在对砂岩的储层质量没有显着影响。苏尔玛组页岩富含伊利石,含有大量绿泥石和高岭石,可能主要为碎屑,绿土成伊利石的成岩作用。砂岩中的粘土矿物通常包括机械渗透的蒙脱石粘土,这些粘土最终在中成岩阶段演变成颗粒覆盖的绿泥石和/或伊利石。粘土/粘土矿物的存在对砂岩的储层质量没有显着影响。苏尔玛组页岩富含伊利石,含有大量绿泥石和高岭石,可能主要为碎屑,绿土成伊利石的成岩作用。

更新日期:2022-06-29
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