The porosity structures of a permeable rock can have remarkable effects on pore-fluid flow within the rock. According to the modern mineralization theory, the mineralization pattern in a hydrothermal ore-forming system is strongly dependent on the pore-fluid flow velocity, so that different porosity structures of a permeable rock can affect significantly hydrothermal mineralization patterns within the permeable layers consisting of fluid-saturated porous rocks. This paper presents a semi-analytical approach, in which pore-fluid velocity is directly used as fundamental primary variables in the governing equations of the problem and the property matrices of finite elements are analytically evaluated in a purely mathematical manner, to ensure the high accuracy of the obtained pore-fluid velocity, which is involved in controlling mineralization patterns in hydrothermal ore-forming systems. After the proposed semi-analytical approach is verified through comparing the numerical solution with the analytical solution for a benchmark problem, it has been used to investigate how different porosity structures can affect the hydrothermal mineralization patterns within permeable horizontal layers consisting of fluid-saturated porous rocks through using a generic model, which can be viewed as the representation of a generalized and simplified geological model. Main outcomes of this study have demonstrated that: (1) the proposed semi-analytical approach can produce highly-accurate numerical solutions for solving coupled pore-fluid flow and heat transfer problems in fluid-saturated porous rocks with different porosity structures; (2) the different porosity structure within a permeable horizontal layer consisting of fluid-saturated porous rocks can have a significant effect on the hydrothermal mineralization pattern of the permeable horizontal layer; (3) layered pore-fluid vertical velocity focusing may take place within a permeable horizontal layer involving a heterogeneous porosity structure.

可渗透岩石的孔隙结构对岩石内的孔隙流体流动具有显着影响。根据现代矿化理论，热液成矿系统中的矿化模式强烈依赖于孔隙流体的流速，因此渗透性岩石的不同孔隙度结构可以显着影响由流体组成的渗透层内的热液矿化模式。 -饱和的多孔岩石。本文提出了一种半解析方法，其中孔隙流体速度直接作为问题控制方程中的基本主变量，并以纯数学方式解析评估有限元的属性矩阵，以确保高精度获得的孔隙流体速度，这涉及控制热液成矿系统中的成矿模式。在通过将数值解与基准问题的解析解进行比较来验证所提出的半解析方法后，它已被用于研究不同的孔隙度结构如何影响由流体饱和的多孔岩石组成的可渗透水平层内的热液矿化模式通过使用通用模型，可以将其视为广义和简化的地质模型的表示。本研究的主要成果表明：（1）所提出的半解析方法可以产生高精度的数值解，用于解决具有不同孔隙度结构的流体饱和多孔岩石中的耦合孔隙流体流动和传热问题；(2) 由流体饱和的多孔岩石组成的可渗透水平层内不同的孔隙度结构对可渗透水平层的热液成矿模式有显着影响；(3) 层状孔隙流体垂直速度聚焦可能发生在具有非均质孔隙结构的可渗透水平层内。