高温高压的深部流体会沿着断裂带向上移动。随着压力和温度的降低，超临界流体逐渐变成次临界流体（或气体）。深部流体最丰富、最常见组分是H2O和CO2。深部流体运移过程中与围岩发生地球化学反应，改变流体化学组分。通道逸出流体会携带丰富的深部地质活动信息。本项目采取野外调查、室内实验、数值模拟和天然类比相结合的方法，研究深部流体运动-热传导-地球化学-岩石力学耦合过程和地表响应反馈机理和定量化规律，建立多场耦合数值模拟系统，评价典型区域流体压力、温度、水化学和同位素成分等地表响应的深部流体活动和运移过程，以及不同条件下地热水、CO2逃逸速率。该研究涉及渗流力学、地质、水文地质、地球化学、地热和岩石力学等多学科，将推动地下复杂环境的多学科交叉研究和国内国际上该领域的发展。不仅对基础地学研究有重大意义，且具有较宽广的地质工程应用前景，为有关地热能开发和CO2储存安全等问题的解决提供科学理论和技术方法。

Deep fluids with high temperature and pressure move up along fault zones. With the pressure and temperature decreasing, the supercritical fluids gradually transform into subcritical fluids (or gases). The most common and abundant constituents of deep fluids are CO2 and H2O. Deep fluids interact with surrounding rocks, and then change the chemical composition. The upward fluids coming from channels often carry a lot of information about the deep geological activities. This proposal will use field survey, laboratory experiment, numerical simulation and natural analogue methods, to investigate the coupled mechanisms of deep fluids flow-heat transfer-geochemistry-rock mechanics, to establish a numerical modeling system of this coupled multiple fields, to predict the responses at the shollow and land surface of fluid pressure, temperature, chemical and isotope composition in typical study sites, and to evaluate the escape rates of geothermal and CO2 under different control conditions. The proposed research involving a number of disciplinaries including underground seepage, geochemistry, petrology and geothermics, will promote the multi-disciplinary study for underground complex environments, and accelerate national and international researches in this field. The investigation will have not only great significance for fundamental geosciences, but also have broad practical application prospects. The numerical system developed by this proposed project will provide scientific methods to solve the problems related to geothermal, and CO2 geological storage.