中文摘要：

大型地下水封油库分期建设中，新建地下水封油库可能会对已投产的同类洞库水幕系统及渗流场产生一定影响，进而可能导致已建油库发生油气外泄等安全事故，但目前国内外对该问题的研究甚少。以在邻近某一已建大型地下水封油库附近扩建国家三期战略石油储库项目为背景，研究因扩建项目施工改变库区渗流场而导致的对已投产大型水封油库储油安全性的影响。通过洞库实际涌水量资料反演分析获取库区岩体的等效渗透张量，采用COMSOL Multiphysics软件模拟已建成的地下水封油库运营期的渗流场，并将其作为初始渗流场，进而模拟研究新建洞库开挖情况下渗流场的演化规律。以洞库区地下水位线、水封压力及围岩渗水量为评判指标，分析新建洞库对运行洞库水封可靠性的影响，研究表明：当两期洞库间距超过200m时，即使不设置中央垂直分离水幕系统，新建洞库施工也不会对已投产洞库的水封可靠性产生影响，即确保储油安全的最小洞库间距为200m。研究成果对评价在已投产地下水封油库附近修建同类油库的可行性及相互影响程度提供了理论依据。

英文摘要：

During the phased construction of large water-sealed oil storage, the construction of a newly built underground water-sealed oil storage has a certain degree of impact on the water curtain system and the seepage field of the nearby under-production similar underground structure. And then may cause safety risks to the already built storage such as oil and gas leakage. However, for the time being, domestic and foreign research on this issue seems little. This paper is based on a large underground water-sealed strategy oil storage＇s extension phase-three project. The change of seepage field which is influenced by the new-construction of extension phase-three poses a safety impact on under-production extension phase-two project. This paper back-calculates the permeability tensor based on the field measured data. Then it simulates the stable seepage field of the under-production underground water-sealed oil storage using the software COMSOL Multiphysics. It views the seepage field as the initial seepage field. And it then simulates the evolution law of existing seepage field changes during new cavern excavation. It views the underground water level, water pressure and cavern area line rock seepage as the evaluation index. The analysis is about the new-construction cavern＇s impact on the water seal reliability of the under-production cavern. The research results show that when the separation distance of these two phase cavern is more than 200m, even if without setting up the central vertical separation of water curtain system, new-construction cavern has no impact on the water seal reliability of the under-production cavern. The minimum safe storage cavern separation distance is 200m. The research results provide a reasonable theoretical support for the feasibility and impact of the construction of similar oil storage in the vicinity of the underground water-sealed oil storage.