增强型地热系统热固流耦合数值模拟与分析

为了研究增强型地热系统热储段温度场分布的特点，以及系统在开采过程中结构性能的评估和利用效率变化的规律，结合北京市地质结构活动探测的结果，建立了增强型地热系统热固流耦合微分控制方程，提出了天然裂隙-断层模式热固流的二维数学模型。基于离散裂隙网络模型，对裂隙-断层模式的岩体-水流耦合换热过程进行数值模拟与分析。通过不同算例设置，进行了12 a的计算研究，分析了水流流速、地层断距等因素对岩体温度场、水流温度场的影响效果。在此基础上，总结了不同生产距离水流出口温度和不同岩体固定距离点温度随时间的变化规律。

Numerical Simulation and Analysis of the Coupled for Heat-fluid-solid in Enhanced Geothermal Systems

In order to study the characteristics of the temperature field distribution in the enhanced geothermal system heat storage period,and the evaluation of system structure performance in the process of mining and utilization efficiency of the law of the change, based on the geological structure in Beijing activity detection results, and the differential control equations of the coupled for heat-fluid-solid processes,a two dimensional coupled model of natural crack-fault was proposed. The numerical simulation and analysis were carried out by using numerical software on the basis of the discrete fracture network model. Through different examples, a 12-year research of computing, the changes of rock-water temperature field caused by different water flow velocity and stratigraphic separation were analyzed. And the change of the temperature of different rock mass production from the water outlet and different fixed distance point with the time were summarized.