陕北能源化工基地岩溶水赋存条件及其影响因素

Mode of occurrence of karst groundwater in the Northern Shaanxi Energy and Chemical Industry Base, China and its influence factors

岩溶水是解决陕北能源化工基地用水的重要水源之一。为了合理地开发岩溶水资源,依据大量的勘探钻孔和抽水试验资料,分析了区域和陕北能源化工基地岩溶水的赋存条件,认为研究区岩溶水的赋存和富集主要受地层岩性、构造条件和水文网的影响。岩溶水主要赋存于奥陶系中统上马家沟组和下马家沟组碳酸盐岩中,其他层位岩溶发育程度低,岩溶水贫乏。受断裂、褶皱构造的控制和黄河排泄基准面的影响,岩溶水在黄河沿岸的府谷县天桥至清水川口段富集,可建成清水川、浪湾和天桥3个集中供水的岩溶水源地。

Karst groundwater is one of the important water sources for solving the use of water in the Northern Shaanxi Energy ＆ Chemical Industry Base. In order to exploit karst groundwater rationally, the mode of occurrence of karst groundwater at a regional scale and in the study area was analyzed using a wealth of data from boreholes and pumping tests. The results show that the occurrence and concentration of karst groundwater in the study area were mainly controlled by the strata/lithology, structural conditions and hydrological network. Karst groundwater in the study area occurs mainly in carbonate rocks of the Middle Ordovician Upper Majiagou and Lower Majiagou formations, while karst is poorly developed in other horizons and karst groundwater is meager. Controlled by faults and folds and influenced by the datum plane of the Yellow RAver discharge. Karst groundwater concentrates in the narrow segment from Tianqiao to the Qingshui Stream mouth, Fugu County, along the bank of the Yellow RAver, where three karst water source fields may be built in Qingshuichuan, Langwan and Tianqiao.