Evolution Mechanism and Circulation Characteristics of Ordovician Limestone Water in Zhuozishan Coalfield
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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1.0 g/L逐渐增大到3.0 g/L，水化学类型由HCO3·Cl·SO4-Mg·Na型向Cl·SO4-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1.0 g/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·SO4-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 research the hydro-geological characteristics of Ordovician limestone water of Zhuozishan Coalfield in the western margin of Ordos Basin, the evolution mechanism and circulation characteristics of Ordovician limestone water were discussed in this paper by using the methods of the reconstruction of the geologic history, the comparison of regional surface and the deep analysis of the key areas.The results showed that the Ordovician deposit of Zhuozishan Coalfield was an open oceanic basin, it was transformed from the eastern continental shelf to the western continental slope environment, which clearly influenced the compositions of the calcite, dolomite and so on in the water-bearing strata. The main geological processes which influenced the hydro-chemical evolution of Ordovician limestone water included the lixiviation, the alternating absorption of cations and redox reaction, which caused the constant evolution of the chemical compositions of the Ordovician limestone water in runoff process.The evolution rule of the chemical compositions Ordovician limestone water in both Luotuoshan and Pinggou Coal Mining Areas from east to west were characterized by the degree of the minera lization increasing gradually from less than 1.0 g/L to 3.0 g/L, the hydro-chemical type transforming from HCO3·Cl·SO4-Mg·Na to Cl·SO4-Na. The make-up runoff conditions of the Ordovician limestone water in the north-west of Limin and Qipanjing Coal Mining Areas were better, the degree of the mineralization was less than 1.0 g/L and gradually increased in the runoff process from northwest to southeast, and the hydro-chemical type was mainly Cl·SO4-Na. The results can provide the basis for the future research on the prevention and control of the Ordovician limestone water hazards of Zhuozishan Coalfield in the western margin of Ordos Basin.
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