鄂尔多斯白垩系盆地地下水系统研究

Groundwater System in Ordos Cretaceous Artisan Basin (CAB)

地下水系统研究是正确评价和合理开发利用区域地下水资源的基础,也是区域地下水资源规划的重要依据。在对鄂尔多斯盆地白垩系岩相古地理和含水介质空间展布研究的基础上,应用区域地下水动力场、水文地球化学场和深井Packer系统所获得的不同深度的水位数据以及同位素资料,将白垩系地下水流系统概括为局部水流系统、中间水流系统和区域地下水流系统3种类型。以盆地中部的白于山地表分水岭为界,划分为南北2个地下水亚系统和5个分支系统,其中南部黄土高原地下水亚系统为典型的自流水盆地,而北部沙漠高原地下水亚系统则具有潜水盆地的特征。

Groundwater system study is an important base to assess regional groundwater resources and to set up the rational groundwater development patterns. Based on litho-paleo-geography of the water-bearing media and its spatial distribution of Ordos Cretaceous artisan basin（CAB） and the features of regional groundwater flow regime, hydrogeochemistry regime and monitoring data about the groundwater level and isotopic analysis at different depth sampled by Packer sampling system in the deep drilling holes, the authors have explored the main characteristics of the groundwater systems in CAB. The groundwater flow system in CAB can be classified into three types： local flow system, medium flow system and regional system. Bordered by the surface divide of Baiyushan Mountain, the CAB can be divided into two groundwater sub-systems and five groundwater branch-systems. Among them, the groundwater sub-system in loess playa in south CAB is characterized by typical artisan basin and the groundwater sub-system in desert playa in north CAB is typical of phreatic basin.