补水溶矿过程中达布逊湖北岸地下卤水水化学变化特征初步研究

Preliminary Study on the Hydrochemical Characteristics of Underground Brines During Replenishing Dissolved Minerals on the North Shore of Dabson Lake

中文关键词:  察尔汗盐湖  固液转化  卤水  水化学特征

英文关键词:Qarhan Salt Lake  Solid-liquid transformation  Brine  Hydrochemical characteristics

中文摘要:

      以察尔汗盐湖达布逊区段补水溶采区为研究区,靠近补水渠的D01、D03以及D05水文观测孔地下卤水为研究对象,通过水化学、相图等分析方法,研究了地下卤水在固液转化过程中水化学的时空变化特征及其影响因素。研究结果表明,储卤层中卤水化学特性在空间上具有明显差异性。在纵向上,随深度增加Na⁺、SO₄2-浓度、pH值降低,而Mg²⁺、Cl-、HCO₃-、Li⁺、B³⁺浓度、TDS和比重升高；在横向上,D01孔中卤水具有较高的Na⁺、SO₄2-、HCO₃-、Li⁺浓度、pH值以及较低的TDS和比重；D03孔中卤水具有较高的K⁺、B³⁺浓度；D05孔中具有较高的TDS、比重、Mg²⁺、Ca²⁺、Cl-以及Sr²⁺浓度。揭示了卤水在盐层中的滞留时间、盐层渗透性差异、矿物组合与分布及温度变化是影响地下卤水水化学分布特征的主要因素,并初步研究认为补水溶矿具有局限性,D01孔受补水影响最大,D03孔次之,D05孔受补水影响较弱。

英文摘要:

      Taking the water replenishing-dissolved mining area of Dabson section of Qarhan Salt Lake as the research area, according to the underground brines of D01, D03 and D05 hydrological observation holes close to the recharge channel, through hydrochemistry, phase diagram and other methods, analysis of the temporal and spatial variation characteristics and influencing factors of hydrochemistry in the process of solid-liquid transformation of underground brine. The results show that the hydrochemical characteristics of brine in brine reservoir have obvious difference in space. In the longitudinal distribution, the concentrations of Na⁺, SO2-₄ and pH decreased with increasing depth, while the concentrations of Mg²⁺, Cl-, HCO₃-, Li⁺, B³⁺, TDS and specific gravity increased. In the planar distribution, the brine in well D01 has higher Na⁺, SO₄2-, HCO₃-, Li⁺ concentrations and pH, and lower TDS and specific gravity. The brine in well D03 has a high K⁺ and B³⁺. The TDS, specific gravity, the concentrations of Mg²⁺, Ca²⁺, Cl- and Sr²⁺ were higher in well D05. It is also revealed that retention time of brine in salt bed, the difference of salt layer permeability, mineral association and distribution and temperature change were the main factors affecting the hydrochemical characteristics of brine, and the preliminary study concluded that recharge water dissolve minerals had limitations. Well D01 was most affected by water replenishment, followed by well D03, and hole D05 is less affected by water replenishment.