The key to preventing the seepage of hydrocarbons from underground water-sealed oil storage facilities is to maintain a certain thickness of groundwater on the top of the caverns so that the groundwater pressure can maintain their tightness. However, the presence of fractures in the rockmass that surrounds the caverns complicates the calculation of the seepage field in the oil storage area. Conventional two-dimensional or equivalent three-dimensional seepage models cannot accurately reflect the impact of the fractures on the seepage field. Therefore, in this study, a dual-porosity medium modeling approach was used to develop an unsteady-state seepage model using the three-dimensional discrete element software 3DEC. The model was developed to assess the effect of grouting on the rock mass that surrounds oil storage caverns that took into account the possible presence of non-persistent fractures. Thus, the simulation of the three-dimensional seepage field of large-scale water-sealed oil storage caverns was realized. The three-dimensional seepage field evolution law and seepage control effect under different working conditions during the construction and storage phases were studied. The results can provide a particular reference for the construction and operation of large-scale underground water-sealed oil storage caverns.

防止碳氢化合物从地下水封储油设施渗漏的关键是在洞穴顶部保持一定的地下水厚度，使地下水压力保持其密封性。然而，洞穴周围岩体中裂缝的存在使储油区渗流场的计算变得复杂。常规二维或等效的三维渗流模型不能准确反映裂缝对渗流场的影响。因此，在本研究中，采用双孔隙介质建模方法，使用三维离散元软件 3DEC 开发非稳态渗流模型。开发该模型是为了评估注浆对储油洞穴周围岩体的影响，其中考虑了可能存在的非持久性裂缝。从而实现了大型水封储油洞室三维渗流场的模拟。研究了施工期和蓄水期不同工况下三维渗流场演化规律及渗流控制效果。研究结果可为大型地下水封储油洞室的建设和运营提供一定的参考。研究了施工期和蓄水期不同工况下三维渗流场演化规律及渗流控制效果。研究结果可为大型地下水封储油洞室的建设和运营提供一定的参考。研究了施工期和蓄水期不同工况下三维渗流场演化规律及渗流控制效果。研究结果可为大型地下水封储油洞室的建设和运营提供一定的参考。