对储气库密闭性进行评价是其建设与运行的重要任务，苏北盆地刘庄储气库属于断层控制的断鼻构造边水储气库，通过岩石力学实验与理论分析相结合的方法，从盖层和断层2个方面综合评价刘庄储气库的密封性；从宏观、微观和力学方面评价盖层密封强度；从侧向和垂向评价断层密封能力。研究表明：阜宁组二段一砂组与阜宁组三段二砂组泥岩为研究区内的巨厚盖层，该盖层全区分布且区域分布稳定，岩性组合优越，其黏土矿物含量在30%以上，储气库盖层杨氏模量和脆性指数整体相对较低，杨氏模量普遍小于20 GPa，脆性指数普遍小于45%，黏土矿物组成以伊蒙混层矿物为主，遇水易膨胀，盖层具有良好的油气封堵性。刘①断层断距和倾角均较大，结合研究区内断层面正压力法和上覆地层埋深的经验得出控藏断层垂向密封；砂泥对接定性方法和泥岩涂抹因子定量方法均证明刘庄控藏断层具有较强的侧向封堵性。

The evaluation of underground gas storage（UGS） tightness is a critical aspect of the construction and operation phases. The Liuzhuang UGS in the Subei Basin, characterized by a fault-controlled fault nose structure and edge water UGS, underwent a comprehensive evaluation of its sealing performance. This assessment focused on both cap rocks and faults, incorporating rock mechanics experiments and theoretical analysis. The evaluation analyzed the sealing strength of the cap rock from macroscopic, microscopic, and mechanical perspectives. It was determined that the thick cap rocks are primarily mudstone from the upper part of the second member and the lower part of the third member of the Funing Formation. These cap rocks are widespread throughout the area with stable regional distribution. Their lithology is favorable, containing over 30% clay minerals. The cap rock's mechanical properties, including a Young's modulus generally below 20 GPa and a brittleness index typically under 45%, contribute to its effective sealing capabilities. The predominant clay minerals in the cap rock are illite-montmorillonite mixed layers, which easily expand in water, enhancing the oil and gas seal effectiveness. Furthermore, the fault analysis focused on both lateral and vertical sealing capabilities. The Liu① fault, characterized by significant fault throw and steep dip angles, demonstrated robust vertical sealing obtained through the combination of the positive pressure method on the fault plane and regional experiences with overlying strata depths. The lateral seal of the fault was substantiated using both qualitative methods, like sand-mud docking, and quantitative assessments, including the shale smear factor. These methodologies confirmed that the Liuzhuang reservoir-controlling fault possesses strong lateral sealing properties.