基于水化学特征的“奥灰”地热流体水文地球化学演化机制研究——以济南东部章宁1地热井为例

Study on Hydrogeochemical Evolution Mechanism of "Ordovician Limestone" Geothermal Fluid Based on Hydrochemical Characteristics——Setting No.1 Zhangning Geothermal Well in Eastern Ji'nan as an Example

摘要:

以章宁1地热井的研究为例，在分析地热水水文地球化学特征基础上，对地热水的化学成分形成进行了研究，并通过与相对补给径流区的西曹范、章桃1地下水水化学特征的比较，研究其演化机理。综合分析认为地热水为沉积岩溶滤水，属于中度变质水，地下水流经火成岩侵入体时溶解了大量的Cl及F,HSiO3等微量元素，次为地下水与沿文祖断裂上升的深部热液的混合，导致地热水化学类型的改变。深部热液的水化学成分与济南东地热水与深部热液的混合比例有待进一步研究。

Abstract:

Setting No.1 Zhangning geothermal well as an example, based on analyzing hydrogeochemical characteristics of geothermal water, the formation of the chemical composition of geothermal water has been studied. Comparing with hydrogeochemical characteristics of groundwater in Xicaofan and No.1 Zhangtao in relatively recharge runoff area, evolution mechanism has been studied. Through comprehensive analysis, it is considered that geothermal water is sedimentary karst water filter, and belongs to moderate metamorphic water. When groundwater flows through the igneous rock intrusion, a large amount of trace elements, such as Cl and F, HSiO3 have been dissolved. The mixture of groundwater and deep hydrothermal rising along Wenzu fault lead to a change of chemical types in geothermal water. The mixture ratio between water chemical composition of the deep hydrothermal solution and geothermal water in eastern Ji'nan and deep hydrothermal solution have been studied.