Seepage and heat transfer in the carbonate reservoir under low-temperature tail water reinjection is a complex coupling process, which is an important basis for scientific and reasonable evaluation of geothermal resource sustainability. This study based on the tracer test of double-well reinjection for carbonate heat reservoir, a coupling model of seepage field and temperature field of fracture network is established by using the finite element software COMSOL. The uncertainty analysis is carried out to study the fluid-thermal coupling process of carbonate fracture under the condition of low-temperature tail water reinjection.The variation law of seepage field and temperature field of thermal reservoir under low-temperature geothermal tail water reinjection is revealed, The variation of measured temperature of thermal reservoir pumping side under different reinjection conditions is predicted. The results show that the dominant fracture channels between wells of the fractured heat reservoir in Xian county geothermal field play an important role in controlling the seepage heat transfer. Under the coupling action of the seepage field, pressure field and the temperature field of the heat reservoir, the low-temperature tail water reinjection forms a preferential flow along the dominant channels, which is one of the important factors to consider in the prediction of thermal breakthrough. Reinjection pressure, temperature and well spacing are the main factors for artificial control of geothermal production and reinjection system. In the pumping and reinjection system of Xian county geothermal field, under the conditions of 0.5 MPa reinjection pressure, 30 °C reinjection tail water temperature and 270 m spacing between pumping and reinjection wells, the heat reservoir temperature at the pumping side decreased by 1.5 °C in 100 years.

低温尾注水作用下碳酸盐岩储层的渗流与传热是一个复杂的耦合过程，是科学合理评价地热资源可持续性的重要基础。本研究以碳酸盐岩热储双井回注示踪试验为基础，利用有限元软件COMSOL建立裂缝网络渗流场与温度场耦合模型。通过不确定性分析研究了低温尾水回注条件下碳酸盐岩裂缝的流热耦合过程。揭示了低温地热尾水回注条件下热储渗流场和温度场的变化规律。 ，预测了不同回注条件下热储抽水侧实测温度的变化。结果表明，咸县地热田裂缝性热库井间优势裂缝通道对渗流传热具有重要的控制作用。在热库渗流场、压力场和温度场的耦合作用下，低温尾水回注形成沿优势通道的优先流动，是热储预测中需要考虑的重要因素之一。突破。回注压力、温度和井距是人工控制地热生产回注系统的主要因素。在西安县地热田的抽排回系统中，