摘要
地热回灌是解决地热田开发利用中热储压力下降的一个有效办法．用地球化学方法模拟了在Ｌａｕｇａｌａｎｄ低温（９５℃）地热田回灌过程中可能发生的化学作用．在模拟中考虑了石英等矿物的化学动力学因素．模拟结果表明：在用地热尾水回灌时，虽然混合水对于石英等矿物是饱和的，但由于它们沉淀速度很慢，在实际中不会产生沉淀．至于产生的较少的方解石沉淀，其全部或至少一部分是模型为使混合水达到对于方解石理论上的平衡而产生的．如果用地下水回灌，地下水中的镁将会和地热水中的二氧化硅形成较多的含镁硅酸盐沉淀．
During geothermal exploitation in the Laugaland low_temperature (95℃) geothermal field, the water level decreases with time. Reinjection is a way to deal with this problem. In this paper, geochemical modelling of mixing is employed to study the chemical processes that may take place during the reinjection. In the modelling, kinetics factor for some silicates deposition is considered. According to modelling results, no silicate deposition problem is expected if the geothermal tail water is used for injection, even if the water is supersaturated with respect to quartz and other silicates. The mass of calcite produced is insignificant. Furthermore, all, or at least some of calcite, is produced to reach theoretical equilibrium. On the contrary, if cold groundwater was to be used for injection, more magnesium silicate deposition would take place.
出处
《地球科学（中国地质大学学报）》
EI
CSCD
北大核心
1998年第6期631-634,共4页
Earth Science-Journal of China University of Geosciences
基金
联合国大学冰岛地热高级研修班提供科研经费资助
关键词
地热水
回灌水
地球化学模拟
地热田
开发利用
geothermal reinjection
geochemical modelling
mineral deposition
chemical kinetics factor.
