The parameters of grain size, contents of silica, kaolinite, hydromica, calcite, and a geological time of tight sandstone reservoirs in Upper Paleozoic in Ordos basin were researched thoroughly, and the impact of the diagenetic evolution process of different sandstone types on porosity and throats was analyzed, based on the quantitative statistics from thin sections, measurements of porosity and permeability, and conventional and constant-rate mercury injection tests. We not only build the evolution of porosity through process-oriented numerical simulations during the geological time but also establish effect-oriented numerical simulations between porosity and different diagenesis parameters. Furthermore, we set up a fitting relationship between diagenetic factors and pore throats in different gas-bearing reservoirs. Differentiation results in the evolution of porosity and a pore-throat system of sandstone types have clear characteristics, such as lithic quartz sandstones of the He 8 Member in the Sulige area and quartz sandstones of the Shan 2 Member in the Yulin area. The fitting results show that the main factors influencing the evolution of porosity and a pore-throat system are grain size and siliceous cement, which can also be validated by the measured data on two gas-bearing intervals. The results are important to a deep understanding of the relationship between the reservoir continuing to experience porosity and permeability evolution and the timing of petroleum charging into the reservoir and can also be applied elsewhere as a quick means in high grading areas of risks during field development.

中文翻译：

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鄂尔多斯盆地上古生界孔喉演化数值模拟研究

深入研究了鄂尔多斯盆地上古生界致密砂岩储层粒度、二氧化硅、高岭石、水云母、方解石含量及地质年代等参数，研究了不同砂岩类型成岩演化过程对孔隙度和喉道的影响基于薄片的定量统计数据、孔隙度和渗透率的测量以及常规和恒速压汞测试进行了分析。我们不仅在地质时期通过面向过程的数值模拟来构建孔隙度的演化，而且还在孔隙度和不同成岩参数之间建立面向效果的数值模拟。进一步建立了不同含气储层成岩因素与孔喉的拟合关系。孔隙度演化分异结果，砂岩类型孔喉系统特征明显，如苏里格地区河8段岩屑石英砂岩和榆林地区单二段石英砂岩。拟合结果表明，影响孔隙度和孔喉系统演化的主要因素是粒度和硅质胶结物，这也可以通过两个含气层段的实测数据进行验证。这些结果对于深入了解储层继续经历孔隙度和渗透率演化与石油注入储层的时间之间的关系非常重要，并且也可以作为油田开发过程中高等级风险区域的快速手段应用于其他地方。