The pore-throat structures play a dominant role in the evaluation of properties of tight sandstone, but it remains difficult to determine the related parameters and understand their impact on reservoir quality. Hence, toward this end, we analyze the experimental data that are indicative of the pore-throat system, then we investigate the effect of fractal dimensions of pore-throat structures on petrologic and physical properties, and finally, the optical observations, fractal theory, and prediction model were integrated to explore the qualities of various reservoir types in tight sandstones. The results show that the fractal dimensions of the mercury intrusion curve correspond to three pore-throat types and those of the mercury extrusion curve could correspond to two pore-throat types. Five types of reservoirs were identified, the best reservoir type has a high percentage of interparticle and dissolution pores but a low proportion of clay-related pores, and the differences in pore-throat connectivity of various types affect storage capacity significantly. The storage ability prediction models of various reservoir types are raised by integrated experimental data. This work employed a comprehensive fractal theory based on capillary pressure curves and helps to explore how pore-throat systems influence reservoir quality in tight sandstones.

中文翻译：

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孔喉系统对致密砂岩分形特征的影响

孔喉结构在致密砂岩物性评价中起主导作用，但相关参数的确定和对储层质量的影响仍存在困难。因此，为此，我们分析了表明孔喉系统的实验数据，然后我们研究了孔喉结构的分形维数对岩石学和物理性质的影响，最后是光学观测、分形理论、与预测模型相结合，探索致密砂岩中各种储层类型的性质。结果表明，压汞曲线的分形维数对应于三种孔喉类型，压汞曲线的分维数可对应两种孔喉类型。确定了五种类型的水库，最佳储层类型颗粒间孔隙和溶蚀孔比例高，黏土孔隙比例低，不同类型的孔喉连通性差异显着影响储集能力。综合实验数据建立了各种储层类型的封存能力预测模型。这项工作采用了基于毛细管压力曲线的综合分形理论，有助于探索孔喉系统如何影响致密砂岩的储层质量。