Diagenetic attributes of Badabagh Member sandstone of Jaisalmer Formation, western Rajasthan, India: implications toward reservoir quality

IF 1.827 Q2 Earth and Planetary Sciences Arabian Journal of Geosciences Pub Date : 2024-12-18 DOI:10.1007/s12517-024-12143-8
Taskin Ahmed, Tahreer Ayaz, Abdullah Khan, Bushra Noor, Naseem Akhtar
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Abstract

The Badabagh Member sandstone is mainly quartz arenite, and its composition ranges from sub-arkose to sub-lithic arenite. Petrographic analysis, scanning electron microscopy (SEM), X-ray diffractometer (XRD), and quantitative measurements of reservoir properties were utilized to thoroughly examine the physical and diagenetic characteristics of the Badabagh Member sandstone. Mechanical compaction; the precipitation of calcareous, ferruginous, and silica cement; the creation of clay minerals; the breakdown and alteration of unstable clastic grains like feldspar and rock fragments; and grain fracturing are among the identified diagenetic properties. Primary porosity was greatly decreased by mechanical compaction and using authigenic cement, such as ferruginous, calcareous, and silica. Clastic grains and cement dissolved, resulting in secondary porosity. Porosity was estimated to have been 40% at first, then compaction decreased it to approximately 9.76%, and cementation further reduced it to 28.03%. Compared to compaction, cementation had a relatively greater effect on the reduction of porosity in the Badabagh Member sandstone. On the other hand, some primary porosity was preserved due to sporadic patches of calcareous cement and imperfect filling. Physical compaction, cementation, and grain ductility were primary contributors to reduced porosity and permeability, whereas clay coatings like kaolinite booklet-type coating, pore-lining chlorite coating around grains, and feldspar dissolution were instrumental in preserving reservoir quality by creating secondary porosity. The sandstone under study exhibits diagenetic processes that are intimately related to its reservoir potential.

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印度拉贾斯坦邦西部Jaisalmer组Badabagh段砂岩成岩属性及其对储层质量的影响
巴达巴赫段砂岩主要为石英砂质,组成范围为亚长石-亚岩屑砂质。利用岩石学分析、扫描电子显微镜(SEM)、x射线衍射仪(XRD)和储层性质定量测量,全面研究了Badabagh段砂岩的物理和成岩特征。机械压实;石灰质、铁质和硅质水泥的沉淀;粘土矿物的产生;长石、岩屑等不稳定碎屑颗粒的破碎蚀变;颗粒破碎是已确定的成岩性质之一。机械压实和使用自生水泥(如含铁、钙质和二氧化硅)大大降低了原生孔隙度。碎屑颗粒和胶结物溶解,形成次生孔隙。孔隙度初步估计为40%,压实作用使孔隙度降至9.76%左右,胶结作用进一步使孔隙度降至28.03%。与压实作用相比,胶结作用对Badabagh段砂岩孔隙度的降低作用相对更大。另一方面,由于钙质胶结的零星斑块和充填不完善,保留了一些原生孔隙。物理压实、胶结和颗粒延展性是降低孔隙度和渗透率的主要原因,而粘土涂层(如高岭石小卷型涂层、颗粒周围的绿泥石孔衬涂层和长石溶蚀)则有助于通过形成次生孔隙来保持储层质量。砂岩的成岩作用与其储集潜力密切相关。
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来源期刊
Arabian Journal of Geosciences
Arabian Journal of Geosciences GEOSCIENCES, MULTIDISCIPLINARY-
自引率
0.00%
发文量
1587
审稿时长
6.7 months
期刊介绍: The Arabian Journal of Geosciences is the official journal of the Saudi Society for Geosciences and publishes peer-reviewed original and review articles on the entire range of Earth Science themes, focused on, but not limited to, those that have regional significance to the Middle East and the Euro-Mediterranean Zone. Key topics therefore include; geology, hydrogeology, earth system science, petroleum sciences, geophysics, seismology and crustal structures, tectonics, sedimentology, palaeontology, metamorphic and igneous petrology, natural hazards, environmental sciences and sustainable development, geoarchaeology, geomorphology, paleo-environment studies, oceanography, atmospheric sciences, GIS and remote sensing, geodesy, mineralogy, volcanology, geochemistry and metallogenesis.
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