Authigenic minerals formed during diagenesis in conjunction with compaction by burial have long been known to lead to porosity-loss of sandstones, and a subsequent deterioration in reservoir quality. The diagenetic impact on reservoir quality and permeability heterogeneity measured horizontal and vertical to bedding was characterized in three fluvio-eolian Lower Permian Rotliegend outcrops from the Flechtingen High, the northern Hesse Basin (both Germany) and the Vale of Eden (UK) using point-counting, polarized light-microscopy, helium pycnometry and permeability measurements. Results show significant porosity (10 to 35%) and permeability (0.01 to 10,000 mD) ranges largely independent of depositional environment. The major control on reservoir quality in Cornberg Sandstones are dolomite and siderite cementation in conjunction with illitization and illite and kaolinite cementation, leading together with quartz cementation to a mostly cemented IGV and poorest reservoir quality (avg. horizontal permeability: 0.96 mD). Flechtingen Sandstones are most intensely compacted due to the lack of significant early diagenetic cement phases and continuous illitic grain-to-grain coatings, which inhibited intense quartz cementation but enhanced chemical compaction at quartz grain contacts, resulting in intermediate reservoir quality (avg. horizontal permeability: 34.9 mD). Penrith Sandstones lack significant authigenic phases besides quartz due to carbonate dissolution during uplift. They show the least amount of detrital feldspars and clay minerals, leading to no major reservoir quality reduction by burial diagenetic clay mineral alterations, resulting in the highest reservoir quality (avg. horizontal permeability: 5900 mD). Additional results highlight higher horizontal to vertical permeability ratios k_h/k_v in less homogeneous sandstones of < 10 mD of 10, and in more homogenous, higher permeable sandstones > 1000 mD of 1. Although detrital and authigenic sample compositions vary throughout the studied areas, the general effect of grain coatings coverages on syntaxial cement inhibition and chemical compaction can be delineated. This study increases the understanding of porosity reduction in sandstones, as it confirms the necessity to differentiate between the illitic grain-to-grain coatings and illitic grain-to-IGV coatings. As a result, the enhancing effect of illite on chemical compaction on quartz grain-grain boundaries can be better constrained, as well as the effect of grain coatings on quartz cementation. This is relevant for reservoir quality and risk assessment in hydrocarbon and geothermal plays as well as in storage.

长期以来，众所周知在成岩过程中形成的自生矿物与通过埋藏进行压实会导致砂岩的孔隙度损失，进而导致储层质量下​​降。在弗莱廷根高地，黑森盆地北部（德国）和伊甸谷（英国）的三个潮风下二叠统Rotilegend露头上，描述了成岩作用对水平和垂直于顺层的储层质量和渗透率非均质性的影响。计数，偏振光显微镜，氦比重瓶法和渗透率测量。结果表明，显着的孔隙率（10％到35％）和渗透率（0.01到10,000 mD）范围很大程度上与沉积环境无关。康伯格砂岩对储层质量的主要控制是白云岩和菱铁矿固结，再加上伊利石，伊利石和高岭石固结，再加上石英固结，形成了大部分胶结的IGV和最差的储层质量（平均水平渗透率：0.96 mD）。Flechtingen砂岩由于缺乏明显的早成岩胶结相和连续的不规则的晶间晶粒涂层而被最密集地压实，这抑制了强烈的石英胶结作用，但增强了石英颗粒接触面的化学压实作用，从而导致了中等储层质量（平均水平渗透率） ：34.9 mD）。Penrith砂岩除了石英外，由于隆起过程中碳酸盐的溶解，缺乏明显的自生相。它们显示出最少的碎屑长石和粘土矿物，不会因埋藏成岩粘土矿物的改变而使储层质量大幅度下降，从而导致了最高的储层质量（平均水平渗透率：5900 mD）。其他结果突出显示了更高的水平渗透率和垂直渗透率ķ _ħ / ķ _v小于10 mD的10均匀砂岩和大于1000 mD的1更高均匀度较高的渗透砂岩可以描述压实度。这项研究增加了对砂岩孔隙度降低的认识，因为它证实了区分硬质颗粒-IGV涂层和硬质颗粒-IGV涂层的必要性。结果，可以更好地限制伊利石对石英晶粒-晶界上化学致密化的增强作用，以及晶粒涂层对石英胶结的作用。这与碳氢化合物和地热层以及储层中的储层质量和风险评估有关。