The permeability decrease caused by the increase in effective stress notably influences the development of tight sandstone reservoirs. Therefore, it is necessary to study permeability stress sensitivity characteristics. Permeability stress sensitivity evaluation experiments of tight sandstone were conducted. On this basis, the influencing factors were analyzed by means of scanning electron microscopy (SEM), cast thin section (CTS) and high-pressure mercury intrusion (HPMI). The results show that permeability decreases with increasing effective stress and that the decreasing trend gradually slows. After the effective stress is restored, permeability cannot be fully recovered. The microscopic pore structure has an important influence on stress sensitivity. According to the characteristics of the capillary force curve, the pore structure can be divided into three types: intergranular, dissolved and micro pore types. Reservoirs of the intergranular pore type have a low permeability stress sensitivity, and permeability slightly decreases with increasing effective stress, followed by reservoirs of the dissolved pore type, and those of the micro pore type have the highest permeability stress sensitivity. In addition, petrological characteristics also influence permeability stress sensitivity. The contents of flexible lithic fragments and clay mineral interstitial material are positively correlated with reservoir permeability stress sensitivity, and those of quartz skeleton particles and siliceous interstitial material are negatively correlated with the latter. A better understanding of permeability stress sensitivity and its influencing factors can provide a reference for the development of tight sandstone reservoirs influenced by it.

有效应力增加引起的渗透率下降，明显影响了致密砂岩油藏的发育。因此，有必要研究渗透率应力敏感性特征。进行了致密砂岩的渗透应力敏感性评价实验。在此基础上，通过扫描电子显微镜（SEM），铸薄切片（CTS）和高压汞侵入法（HPMI）分析了影响因素。结果表明，渗透率随有效应力的增加而减小，减小趋势逐渐减缓。恢复有效应力后，渗透性无法完全恢复。微观孔结构对应力敏感性具有重要影响。根据毛细作用力曲线的特性，孔隙结构可分为三种类型：粒间，溶解和微孔类型。粒间孔型储层的渗透率应力敏感性较低，渗透率随有效应力的增加而略有下降，其次是溶解孔型储层，而微孔型储层的渗透率应力敏感性最高。另外，岩石学特征也影响渗透率应力敏感性。柔性岩性碎屑和粘土矿物间隙材料的含量与储层渗透应力敏感性呈正相关，而石英骨架颗粒和硅质间隙材料的含量与后者呈负相关。