封闭不良天然气孔突水过程的水文地球化学特征

发布时间：2018-04-06 22:22

本文选题：水文地球化学特征　切入点：封闭不良天然气孔　出处：《煤田地质与勘探》2017年05期

【摘要】：为了查清封闭不良天然气孔突水过程中充水水源的变化规律,开展了气孔出水水文地球化学特征研究。结果表明:"大53"天然气孔突水过程中TDS浓度逐渐降低,初期为SO_4·Cl—Na型水,位于Piper三线图右端部,来自直罗组;中期TDS浓度降至500多mg/L,属于HCO_3·SO_4·Cl—Na型水,位于Piper三线图右端偏下,来自白垩系;期间煤层底部涌出高TDS的SO_4·Cl—Na型水,该水样点位于三线图右端偏上。气孔处理过程中,水样中γ(Ca)/γ(Na)系数均远大于其他水样,且HCO_3~ 未检出,为煤层顶板直罗组水化学特征,表明阻隔了2-1煤层与白垩系含水层和2煤—6煤含水层的水力联系。取距离阈值20,分层聚类分析可以将水样分为白垩系水和侏罗系水,距离阈值5又可将侏罗系含水层水细分为直罗组2段、直罗组1段和2煤—6煤含水层水,实现了对气孔突水过程中充水水源变化规律的准确判别。
[Abstract]:In order to find out the change rule of water source during the process of sealing bad natural gas pore water inrush, the hydrogeochemical characteristics of pore outlet water were studied.The results show that the concentration of TDS decreases gradually during the process of "Da 53" natural gas pore water inrush, the initial stage is SO_4 Cl-Na type water, which is located at the right end of the Piper three-line diagram and comes from the Zhiluo formation, and the TDS concentration decreases to more than 500 mg / L in the middle period, which belongs to HCO_3 SO_4 Cl-Na type water.It is located at the right end of the Piper three-line map, which comes from the Cretaceous system, during which the high TDS SO_4 Cl-Na type water is gushed from the bottom of the coal seam, and the water sample is located on the right end of the three-line map.In the process of pore treatment, the coefficient of 纬 -CaO _ (2) / 纬 _ (Na) in water samples is much higher than that of other water samples, and HCO _ 3 ~ + is not detected, which is a hydrochemical feature of Zhiluo formation on top of coal seam, which indicates that the hydraulic connection between coal seam 2-1 and Cretaceous aquifer and coal aquifer of No. 2 coal 6 is blocked.The water samples can be divided into Cretaceous water and Jurassic water by stratified cluster analysis, and the water of Jurassic aquifer can be subdivided into Zhiluo formation 2, Zhiluo 1 and 2 coal 6 coal aquifer water by distance threshold 5.The change law of water source in the process of water inrush from stomata is accurately distinguished.
【作者单位】：中煤科工集团西安研究院有限公司;陕西省煤矿水害防治技术重点实验室;
【基金】：国家自然科学基金项目(41302214) 国家重点研发计划课题(2016YFC0501104) 中煤科工集团西安研究院有限公司科技创新项目(2015XAYMS18)~~
【分类号】：P641.4;TD745

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