成矿多过程耦合模型数值模拟研究态势

Numerical simulation for coupled modeling of multiple mineralizing processes

成矿作用是构造变形-热量传递-流体流动-质量转移等四种性质完全不同过程的耦合。数值模拟是通过建立多过程耦合模型来刻画其物理和化学规律。由于这些耦合模型过于复杂而难以得到其解析解,因而数值模拟被用来讨论这些复杂动力学过程。针对成矿预测领域主要的耦合模型:形变-流动模型、形变-热-流动模型、热-流动-质模型、变形-热-流动-质模型,通过这些耦合模型应用实例分析得出,印证了高差和温度变化是流体对流、矿物沉淀发生的重要机制;详释了构造控制流体输运的方式及过程,高渗透率断裂是流体汇聚的有利场所,从而渗透率等控制成矿的关键参数成为成矿预测的主要指标。

Mineralization is commonly the result of full feedback coupling between the four processes of mechanical deformation, thermal transport, fluid flow, and mass transport. Numerical simulation, which sets up the coupled model to depict chemical and physical rule,is used to solve this complex problem. This paper introduce primary coupled models of ore-forming fluid： coupled deformation-fluid flow modeling, coupled deformation-thermal transport-fluid flow modeling, coupled thermal transport-fluid flow-mass transport modeling, coupled deformation-thermal transport-fluid flow-mass transport modeling. The result of these models are presented here to illustrate that gravity and thermal-gradient is the important mechanism for driving fluid flow; how the fluid flow is controlled by some strueture; fluid is favored to the higher permeability fault and rocks. Therefore,various parameters （e. g. permeability） involved in mineralization are critical for predictive exploration.