CO2地质封存中随机裂隙网络走向对盖层密封性影响

Le résumé fourni par la source

In the process of CO 2 geological storage, in order to explore the influence of fracture network orientations on the twophase transport of CO 2 -salt water in the caprock and evaluate the sealing performance of the caprock, six fracture networks with different orientations (with angles of 0° -180° , 30° -150° , 45° -135° , 60° -120° , 90° -90° and 90° -180° , respectively) were selected for numerical simulation, so as to realize the two-phase flow study of CO 2 displacement of salt water under explicit fracture network.It is found that the fracture network orientations directly change the occurrence of water saturation, thereby affecting the difficulty of CO 2 -salt water displacement.When CO 2 reaches the same penetration depth in the caprock, the displacement time decreased by 12.59 times with the fracture angle (0° -60° ), but there is no obvious effect after the inclination angle increased to 60°.With the expansion of the permeability range of the fracture network, the permeability of CO 2 in the caprock increases.Among them, orthogonal fractures (90° -180° ) have the largest permeability.Therefore, considering the fracture network direction is of great significance for the caprock sealing evaluation.基金项目： 国 家 自 然 科 学 基 金 项 目 (No. 42202286,62103198)

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