Most studies concerning the evaluation of containment property for underground water-sealed oil storage caverns have focused on containment safety. However, the water inflow into storage caverns has not been considered. Too great of a water inflow into storage caverns leads to waste in water resources and increased cost of wastewater treatment. In this study, a quantitative index of containment efficiency is proposed, which is related to both the containment safety and the water inflow into storage caverns for the safe and economic operation of underground water-sealed oil storage caverns, i.e., the degree of containment safety that can be provided by the unit water inflow into storage caverns. An evaluation method for containment efficiency is presented from the perspective of optimization of Water Curtain System (WCS) parameters and is applied to an underground water-sealed oil storage cavern. The influences of the WCS parameters and the geometric parameters of rock fractures on the containment efficiency are investigated using the Discrete Element Method (DEM). There is a nonlinear relationship between the quantitative index of containment efficiency and the WCS parameters, as well as the relationship between the quantitative index of containment efficiency and the geometric parameters of rock fractures. An evaluation of containment property for the storage cavern is conducted using the existing containment safety criterion, and the evaluation results are compared with those of containment efficiency. The rationality of the quantitative index of containment efficiency is demonstrated.

有关评估地下水密封储油洞的安全性的大多数研究都集中在安全性上。但是，尚未考虑到流入洞穴的水量。过多的水流入存储洞穴会导致水资源浪费并增加废水处理成本。在这项研究中，提出了一个围护效率的定量指标，它与围护安全性和流入储藏室的水量有关，以确保地下水密封油储藏室的安全和经济运行，即围护安全程度。可以通过单位的水流入存储洞穴来提供。从优化水幕系统（WCS）参数的角度提出了一种围护效率的评价方法，并将其应用于地下水封油库。使用离散元方法（DEM）研究了WCS参数和岩石裂缝几何参数对围护效率的影响。围堵效率定量指标与WCS参数之间存在非线性关系，围堵效率定量指标与岩石裂缝几何参数之间存在非线性关系。使用现有的安全性安全准则对存储洞穴的安全性进行评估，并将评估结果与安全性进行比较。