水幕系统是决定地下水封洞库运营的关键，水幕孔设计是水幕系统的核心组成部分。以国内首个在建的大型地下水封石油储库为背景，运用地下水渗流理论，研究水幕孔间距以及隙宽对地下洞室水封性的影响。研究结果表明，在陡倾结构面条件下，水平水幕孔的间距以及隙宽对水封性具有重要影响。在计算工况中，水幕孔间距为10 m时，水封效果最好；水幕孔间距为30 m时，无法满足水封要求；相同水幕孔间距条件下，隙宽越大，水封效果越好；主洞室拱顶区域，水封效果较差。研究结果可为地下水封石油洞库水幕系统优化设计提供理论依据。

The water curtain hole design is the core part of water curtain system, which is crucial to the operation of the underground water-sealed cavern. Based on the first water-sealed underground cavern in China, the impacts of spacing of water curtain hole and fracture width on the water sealing is studied using the underground water seepage theory. The results show that spacing of horizontal water curtain hole and the fracture widths have important influences on water sealing in steep-inclined structural planes. In the calculation condition, the water sealing reaches the best effect when the water curtain hole spacing is 10 m. Water curtain hole spacing of 30 m is unable to meet the requirements of water sealing. Under the same water curtain hole spacing, the wider the gap width is, the better the effect of water sealing is, the best spacing of water curtain hole is 10 m for the project investigated; the poorer the effect of water sealing is in the crown area of main cavern. The research results provide a theoretical basis for water sealing evaluation of water-sealed oil storage cavern