呼吉尔特矿区石拉乌素煤矿矿井涌水水源判别及定量分析

Identification and Quantitative Analysis of Water Source in Shilawusu Coal Mine of Hujilt Mining Area

针对石拉乌素煤矿主要充水含水层以及井下涌水中各含水层充水的贡献度不清等问题,采用水质全分析、同位素及有机物检测,查明了顶板巨厚复合含水层地下水以及井下涌水中主要离子、矿化度、氢氧同位素、有机物含量特征。研究结果表明:志丹群含水层地下水矿化度平均为237.05mg/L,水化学类型为HCO_(3)-Ca·Na型;直罗组含水层地下水矿化度平均为1371.09mg/L,水化学类型为SO_(4)-Na及SO_(4)·HCO_(3)-Na型;矿井水矿化度平均为1507.08mg/L,水化学类型为SO_(4)·HCO_(3)-Na型;志丹群含水层地下水、直罗组含水层地下水δD与δ^(18)O基本落在当地大气降水线上或其附近,矿井水δD与δ^(18)O基本落在志丹群含水层水和直罗组含水层水之间;白垩系志丹群含水层地下水、直罗组含水层地下水与矿井水的三维荧光光谱相似;同位素分析结果显示井田南翼矿井涌水中志丹群含水层水占31.18%,直罗组含水层水占68.82%,井田北翼矿井水中志丹群含水层水占10%,直罗组含水层水占90%;受体模型计算结果显示井田北翼矿井水中>75%的水来自于直罗组含水层,井田南翼矿井水中直罗组含水层地下水占比在50%-75%;综合分析认为,石拉乌素煤矿井下涌水受白垩系志丹群和侏罗系直罗组含水层共同补给,其中侏罗系直罗组含水层水是矿井涌水的最主要补给来源。

In response to the unclear contribution of the main water filling aquifers and various aquifers in the underground water inflow of Shilawusu coal mine,comprehensive water quality analysis,isotope and organic matter detection were adopted.The content characteristics of main ions,salinity,hydrogen and oxygen isotopes,and organic matter in the groundwater of the roof thick-composite aquifer and underground gushing water were identified.The results indicated that the average mineralization degree of groundwater in the Zhidan group aquifer was 237.05mg/L,and the hydrochemical type was HCO_(3)-Ca·Na type.The average mineralization degree of groundwater in the Zhiluo formation aquifer was 1371.09mg/L,and the hydrochemical types were SO_(4)-Na and SO_(4)·HCO_(3)-Na types.The average mineralization degree of mine water was 1507.08mg/L,and the hydrochemical type was SO_(4)·HCO_(3)-Na type.Zhidan and Zhiluo group aquifer groundwaterδD andδ^(18)O basically falls on or near the local atmospheric precipitation line.TheδD andδ^(18)O of mine water basically fall between the aquifer water of Zhidan group and that of Zhiluo formation.The three-dimensional fluorescence spectrum of groundwater in the Zhidan group aquifer of the cretaceous system,groundwater in the Zhiluo formation aquifer,and mine water were similar.The isotope analysis results showed that the Zhidan group aquifer water accounts for 31.18%,Zhiluo group aquifer water accounts for 68.82%,Zhidan group aquifer water accounts for 10%,and Zhiluo group aquifer water accounts for 90%in the water inflow of the southern wing of the mine field.The calculation results of the receptor model showed that over 75%of the water in the northern wing of the mine comes from the Zhiluo formation aquifer,while the groundwater in the southern wing of the mine accounts for 50%to 75%of the Zhiluo formation aquifer.The comprehensive analysis showed that the underground water gushing in Shilawusu coal mine was supplied by the aquifer of the cretaceous Zhidan group and the jurassic Zhiluo formation,among which the aquifer of the jurassic Zhiluo formation was the main source of mine water gushing.