地下水水质参数在抽水过程中的不稳定性及其水化学模拟——以大庆市齐家水源地为例

INSTABILITY OF GROUNDWATER QUALITY PARAMETERS DURING PUMPING AND ITS HYDROCHEMICAL SIMULATION: EXAMPLE FROM QIJIA WATER SUPPLY BASE

1.
Guangzhou Institute ofGeochemistry, Chinese Academy ofSciences, Guangzhou 510640, China
2.
Department ofEnvironmental Sciences, China University ofGeosciences, Beijing 100083, China
3.
Water Supply Company ofDaqing Oil Administration Bureau, Daqing 163454, China

摘要: 大庆市齐家水源地井口现场和实验室测定的地下水水质参数与其真实情况存在差异.运用水文地球化学手段模拟了地下水从含水层被抽出至地表的过程中由于所承受压力降低不可避免地导致CO₂, H₂S等气体的逸出, 从而影响pH, Eh的测定结果.最后指出了地下水采样测试技术的发展方向.
- 地下水 /
- 采样 /
- 水质参数 /
- 水化学模拟
Abstract: The groundwater quality parameters determined both at the well head and in the laboratory of Qijia water supply base, Daqing city, differ from what happens in the real situation. Hydrogeochemical method is used to simulate the changes of pH and Eh values due to the inevitable degassing of CO₂ and H₂S resulting from the pressure drop in the course of the groundwater pumping from the water-earing bed to the earth surface. The trends in the groundwater sampling are proposed in the final part of the paper.
- groundwater /
- sampling /
- water quality parameter /
- hydrogeochemical simulation

图 1 泰康组地下水中铁的Eh-pH稳定场

ρ (Fe²⁺) =0.65 mg/L, ρ (HCO₃^-) =510 mg/L, ρ (SO₄^2-) =213 mg/L.其中Fe (OH)₃为非晶态

Fig. 1. Eh-pH graph of iron in Taikang groundwater

下载: 全尺寸图片幻灯片

表 1 齐家水源地泰康组含水层水化学成分平均值

Table 1. Mean values of groundwater chemical compositions of Qijia water supply base

表 2 地下水中某些矿物的饱和指数

Table 2. Saturation indices of some minerals in the groundwater

表 3 抽水过程中地下水pH, Eh变化的水化学模拟结果

Table 3. Hydrochemical modeling results of groundwater pH, Eh values during pumping

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