花岗岩型干热岩体与不同注入水体相互作用研究

增强型地热系统(EGS)开发过程中，需要注入循环水体完成提热，但水体注入后与干热岩体反应会产生矿物溶解（或沉淀），破坏人工储层，影响地热能开发。本文以河北马头营区花岗岩型干热岩为研究对象，与该地区地下水、海水、纯水反应，并结合Phreeqc水文地球化学模拟，分析水岩相互作用后干热岩体的矿物变化与注入水体的化学成分变化规律。研究结果表明，不同注入水体与干热岩进行水岩作用，会产生不同类型的矿物溶解与沉淀，海水最终沉淀量较地下水低，主要原因是海水与干热岩体反应生成了具有吸附能力的沸石；适当减少海水中Cl-含量，将处理过的海水作为循环水体将具有强大的潜力和效益。

Study of the interaction between the granitic hot- dry rock (HDR) and different injection waters

During the exploitation of Enhanced Geothermal System (EGS), it is necessary to inject circulating water to complete the heat extraction. However, the reaction between water and hot dry rock (HDR) may cause mineral dissolution (or precipitation), which may destroy the artificial reservoir and affect the development of geothermal energy. In this paper, the dry hot rock in the Matouying district of the Hebei Province is studied together with groundwater, sea water and pure water. A Phreeqc Stimulator is used to analyze the mineral changes of HDR and the chemical composition changes of injection water after the interaction between water and rocks. The research results show that different injection water and HDR will produce different types of mineral dissolution and precipitation. Finally, the precipitation from sea water was lower than that of groundwater, mainly because the sea water reacts with HDR to form zeolite which has adsorption capacity. Correct reduction of the Cl- content in sea water will enhance its benefit as circulating water.