Critical understanding of the reservoir pore-system is crucial for effective fluid-flow. Core-sedimentological description (40 core plugs), petrography (thin section and scanning electron microscopy with energy dispersive spectrometry), x-ray diffractometry, and high-resolution imaging were integrated to characterize pore-modification processes in a deeply buried (ca. 12470–12558 Ft.) non-marine sandstone. The reservoir is dominantly subrounded to subangular, well-sorted to moderately well-sorted, and medium-to fine-grained quartz arenite and lithearenite. Framework ranges from matrix-supported to matrix-devoided types. With a mean point-counted composition of Q₉₅F₀L_5, quartz is the dominant mineral in all samples. Core-derived porosity and permeability range from 0.88 to 16.89% (Average 9.99%) and ~0.00–431.06 mD (Average 66.42 mD), respectively. Intergranular (ɸ_I), micro (ɸ_μ), fracture (C_F), and dissolution (Diss) porosities constitute an estimated 60%, 35%, 3%, and 2% of the total porosity. The pore-spaces are randomly distributed and largely disconnected from one another. Connected pores are linked by necking, tubular, and lamellar pore throats. Pore-destructive diagenetic processes occurred mainly in the early-intermediate diagenetic phase, and to lesser extent in the late diagenetic phase. Pore-enhancement processes were of sparse occurrences. Mechanical compaction, quartz overgrowth development, kaolinitization, sideritization, and calcite cementation are the main pore-occluding processes identified. Quartz overgrowth increased with depth and it shows an inverse relationship with poro-perm. The formation of quartz overgrowth haloes in the Upper Sarir Sandstone Formation were most likely formed from non-insitu silica mobilized into the pore system during post-rift cooling. This study confirms the need for careful heterogeneity modelling even in non-marine deposited reservoir sandstone, notwithstanding their known clean nature in contrast to mud-rich marine reservoirs.

对储层孔隙系统的严格理解对于有效的流体流动至关重要。岩心沉积学描述（40个岩心塞），岩石学（薄截面和具有能谱仪的扫描电子显微镜），X射线衍射仪和高分辨率成像技术被用来表征深埋地（约1 2470年）的孔隙修饰过程。 –12558英尺）非海洋砂岩。该储层主要是亚圆形的至亚角形，分类良好至中等分类，以及中等至细粒度的石英砂岩和锂钙榴石。框架的范围从矩阵支持的类型到无矩阵的类型。平均点组成为Q ₉₅ F ₀ L _5时，石英是所有样品中的主要矿物。岩心衍生的孔隙度和渗透率分别为0.88至16.89％（平均9.99％）和〜0.00–431.06 mD（平均66.42 mD）。晶间（ɸ_我），微（ɸ _μ），骨折（C _˚F）和溶出度（Diss）孔隙度估计占总孔隙度的60％，35％，3％和2％。孔隙空间是随机分布的，并且彼此之间很大程度上不连通。连通的毛孔通过颈缩，管状和层状毛孔喉相连。孔破坏性成岩作用主要发生在中中期成岩阶段，少部分发生在成岩后期。毛孔增强过程很少发生。机械压实，石英过度生长，高岭土化，铁矿化和方解石胶结是确定的主要孔隙闭塞过程。石英的过度生长随着深度的增加而增加，并且与孔隙渗透率成反比关系。上萨里尔砂岩组中石英过度生长的光晕很可能是由非石英形成的。裂口后冷却过程中，原位二氧化硅移动到孔隙系统中。这项研究证实，即使与非海洋沉积的储层砂岩相比，其已知的清洁性质（与富含泥浆的海洋储层形成对比），也需要进行仔细的非均质性建模。