地热资源是一种极具竞争力的清洁和可再生能源。地热回灌是实现地热资源可持续利用的必由之路。然而，国内仅在少数地热田进行了对井采灌，回灌率很低，对地热资源优化采灌模式的研究很少。本项目以华北地区牛驼镇地热田为例，针对中低温地热田规模化开采中的回灌模式优化问题，提出集中采灌模式，开展群井回灌试验，应用地球化学示踪和非等温多相流数值模拟相结合的手段描述不同采灌模式情景下热储流体温度、压力的动态演化过程，基于可持续开发利用目标，对比评估地热田采灌方案与优化途径。实践上，将为牛驼镇地热田可持续开发提供重要的科学依据。理论上弥补国际和国内其他中低温地热田，尤其是岩溶储层的可持续开发利用机理研究的不足，发挥示范作用。

Geothermal energy is one of the most realistic and competitive renewable energy sources. Reinjection must be carried out for sustainable use of geothermal resources. However, only in a few geothermal fields there are reinjection wells, and generally the efficiency is very low because the doublette model is used (one production well is accompanied with one reinjection well). There is almost no research on other reinjection modes. The rationale of this study is to identify the optimal mode of reinjection for medium-low geothermal field, with Niutuozhen geothermal field as a case study. We propose a mode of separated production and reinjection sectors. Then different modes will be modeled to predict the response of geo-temperature and water table with the data obtained from multi-well tracer test and reservoir production monitoring. The study will be useful to sustainable development of Niutuozhen geothermal field and will be a good reference to the development of medium-low geothermal field (especially the ones with karstic reservoirs) at home and abroard.