桌子山煤田奥陶纪灰岩水演化机理和循环特征

发布时间：2018-04-04 03:56

本文选题：鄂尔多斯西缘　切入点：奥陶纪灰岩水　出处：《矿业安全与环保》2017年02期

【摘要】：为系统研究鄂尔多斯盆地西缘桌子山煤田奥陶纪灰岩水文地质特征,采用地质历史再造、区域面上对比、重点区域深度剖析等方法,对该区域奥陶纪灰岩水演化机理和循环特征进行了分析研究,结果表明:桌子山煤田奥陶纪沉积为开阔海盆环境,从东向西由陆棚—大陆斜坡环境转化,对含水岩石中方解石、白云石等重要矿物的组成形成明显的控制。影响奥陶纪灰岩水化学演化的主要地质作用有溶滤作用、阳离子交替吸附作用和氧化还原反应,造成奥陶纪灰岩水在径流过程中化学组分发生了不断演化,表现为骆驼山、平沟矿区从东北到西南,矿化度由小于1.0g/L逐渐增大到3.0g/L,水化学类型由HCO_3·Cl·SO_4-Mg·Na型向Cl·SO_4-Na型水的演化规律;利民、棋盘井矿区西北部奥陶纪灰岩水补给径流条件较好,矿化度小于1.0g/L,由西北向东南径流途径中矿化度逐渐增大,水化学类型都以Cl·SO_4-Na型水为主。该研究成果可为下一步研究鄂尔多斯盆地西缘桌子山煤田底板奥陶纪灰岩水害防治提供依据。
[Abstract]:In order to systematically study the hydrogeological characteristics of Ordovician limestone in the Ordovician coal field in the western margin of Ordos Basin, the methods of geological history reconstruction, regional surface correlation and depth analysis of key areas are adopted.The water evolution mechanism and circulation characteristics of Ordovician limestone in this area are analyzed and studied. The results show that the Ordovician deposits in the Tiaoshan coalfield are open basin environments, which are transformed from the continental shelf to the continental slope environment from east to west, and calcite in the water-bearing rocks is also studied.The formation of important minerals, such as dolomite, is clearly controlled.The main geological processes affecting the hydrochemical evolution of the Ordovician limestone are leaching, cation alternating adsorption and redox reaction, which result in the continuous evolution of the chemical components of the Ordovician limestone water in the course of runoff, which is characterized by Luoyushan.From northeast to southwest of Pinggou mining area, the mineralization degree increases gradually from less than 1.0g/L to 3.0 g / L, the evolution of hydrochemical type from HCO_3 Cl SO_4-Mg Na type to Cl SO_4-Na type water, and the conditions of recharge runoff of Ordovician limestone water in northwestern Qipanjing mining area are better.The salinity is less than 1.0 g / L, and the salinity of runoff from northwest to southeast increases gradually, and the chemical types of water are mainly Cl SO_4-Na type water.The results can provide a basis for further study on the water hazard control of Ordovician limestone on the floor of Taoshan coalfield in the western margin of Ordos Basin.
【作者单位】：中煤科工集团西安研究院有限公司;
【基金】：国家自然科学基金青年科学基金项目(41402220、41302214) 中煤科工集团西安研究院有限公司科技创新基金项目(2016XAYMS09)
【分类号】：P641.461;TD745

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