某海岛地下水封油库渗流场数值模拟

Numerical simulation of seepage field of underground water-realed oil depot in an island

以某海岛地下水封油库项目为工程依托,基于达西定律和溶质运移相关理论,利用有限元软件COMSOL分析在不同设计方案下洞室渗流场的变化情况,对洞室的水封安全性做出评价,并研究了库区海水入侵的发展程度。研究表明:该项目需要设置水平水幕,且水平水幕的设计压力值不应小于0.2 MPa,主洞室埋深变化对水封性影响较小,建议埋深为-45 m;在主洞室全开挖未储油的情况下,海水会入侵至主洞室内,呈现先快后慢、从主洞室底部侵入的特点。

Based on the theory of Darcy′s law and solute transport,this paper took a groundwater-sealed oil depot project on a certain island as the engineering support and conducted numerical simulation research using COMSOL finite element software to analyze the variations in seepage field in caverns under different design schemes.The water-sealed safety of the cavern was evaluated.The development degree of seawater intrusion in the reservoir area was explored.The research indicated that the project required the installation of a horizontal water curtain,and the design pressure value of the horizontal water curtain should not be less than 0.2 MPa.The variation in the depth of the main cavern had a small impact on the water seal,and the recommended buried depth was-45 m.When the main carvern was fully excavated without oil storage,seawater would intrude into the caverns,with seawater intrusion showing a pattern of rapid intrusion followed by gradual intrusion,entering from the bottom of the main cavern.