| 兖州煤田奥陶系灰岩地下水水化学特征及其形成机理 |
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| 关键词:hydrochemical characteristics saturation index water-rock interaction limestone aquifer Yanzhou coalfield |
| 基金项目:国家自然科学基金(编号: 41272269) |
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| 摘要点击次数: 2099 |
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| 摘要: |
| Hydrochemical Characteristics and Formation Mechanism of Ordovician Limestone Groundwater in the Yanzhou Coalfield |
| The Ordovician limestone aquifer of the Yanzhou coalfield in southwest Shandong Province is the main source of mine filling water and one of the main water supply sources, and hence the chemical characteristics and formation mechanism of the Ordovician limestone water can provide the basis for groundwater resource utilization and deep coal mining risk assessment. After sampling and analyzing of the groundwater, the authors found that the major chemical type of groundwater is SO4-Ca-Mg type. The SO2- 4 values are from 537 mg/L to 2 296 mg/L, and the average concentrations of Ca2+ and Mg2+ are 455.7 mg/L and 116.6 mg/L respectively. The pH values range from 6.9 to 8.0. The TDS (total dissolved solids) values vary from 961 mg/L to 3 555 mg/L, increasing linearly with the increase of concentrations of Ca2+ and SO2- 4. These data indicate that the increase of TDS mainly comes from Ca2+ and SO2- 4. The saturation index (SI) data show that groundwater is oversaturated with dolomite and calcite, and undersaturated (SI<0) with gypsum for most of the samples. In addition, the saturation index of gypsum is positively correlated with TDS of groundwater. These results suggest that the interaction between water and rock occurs during the transition of groundwater in limestone aquifer, mainly including dissolution of gypsum, precipitation or dissolution of dolomite and calcite, and ion exchange. |
| BIAN Yue-yue,ZHAO Dan,HAN Yong.2017.Hydrochemical Characteristics and Formation Mechanism of Ordovician Limestone Groundwater in the Yanzhou Coalfield[J].Acta Geoscientica Sinica,38(2):236-242. |
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