Analysis of water-controlling factors and water-rich zoning of fractured bedrock aquifers in Yongshou County of Shaanxi Province
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摘要: 为系统探讨陕西永寿县基岩裂隙含水层的富水规律,综合传统水文地质调查方法和统计学理论,基于96眼钻孔资料,分析了陕西永寿县基岩裂隙含水层的控水因素,并进行了富水性分区。研究发现: 基岩裂隙含水层厚度空间差异性明显,砂岩裂隙含水层较灰岩裂隙含水层厚度空间差异性大; 基岩裂隙含水层富水性主要受控于岩性、地质构造、基岩地形、补给排泄条件4种因素,贮水类型主要为风化裂隙水、构造裂隙水及成岩裂隙水; 富水区为渭北东北隆起地带老龙山断裂以南奥陶系灰岩岩溶水富水区、仪井地堑羊毛湾水库附近奥陶系灰岩岩溶水富水区、常宁镇北顺什村附近黄土台塬塬心地带富水区,稳定出水量均在 1 000 m3/d 以上。研究成果可为后备水源地建设提供科学决策依据,也可为同类地区富水性研究提供借鉴。Abstract: In order to systematically investigate the water-rich law of fractured bedrock aquifers in Yongshou County of Shaanxi Province, the authors in this paper combined the traditional hydrogeological survey method and statistical theory, and analyzed the water-controlling factors of fractured bedrock aquifers and water-rich zoning based on the data of 96 boreholes. The results show that the thickness of fractured bedrock aquifers has obvious spatial difference, and the thickness of sandstone fissure aquifers has greater spatial difference than that of the limestone fissure aquifers. The water-rich characteristics of bedrock fissure aquifers is mainly controlled by lithology, structure, bedrock topography and recharge and discharge, and the water storage types are mainly weathered fissure water, tectonic fissure water and diagenetic fissure water. The water-rich target areas are delineated and classified as follows: the water-rich areas of Ordovician limestone karst water in south of Laolongshan fault in the northeastern uplift of Weibei area, the water-rich areas of carbonate karst fissure near Mawoowan reservoir of Yijing fault depression zone, and water-rich areas of clastic rock fissure water near Beishunshi village of Changning Town in the heart of the loess plateau, with stable water yield above 1 000 m3/d. The research results could provide scientific decision-making basis for the construction of backup water source areas and scientific reference for the study of water abundance in similar areas.
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