鄂尔多斯白垩系地下水盆地中深层地下水可更新速率  

Evaluation of Groundwater Renewal Ability in the Ordos Cretaceous Groundwater Basin

作　　者：万玉玉[1] 苏小四[1] 董维红[1] 侯光才[2] 

机构地区：[1]吉林大学环境与资源学院/水资源与环境研究所,长春130026 [2]中国地质调查局西安地调中心,西安710054

出　　处：《吉林大学学报（地球科学版）》2010年第3期623-630,共8页Journal of Jilin University：Earth Science Edition

基　　金：中国国土资源大调查项目(1212010331302);高等学校博士学科点专项科研基金项目(20030027020)

摘　　要：为了缓解鄂尔多斯能源基地的供水压力和为当地水资源评价、地下水合理开发利用提供依据,研究该区主要供水水源地的白垩系盆地地下水可更新能力。地下水中溶解无机碳的动力行为可以近似认为与地下水相同,因此,地下水系统中14C的输入、输出浓度可以提供地下水系统可更新能力的重要信息。利用鄂尔多斯白垩系地下水盆地中、深层地下水14C数据,以地下水更新速率为指标,通过同位素数学物理模型定量评价了盆地中、深层地下水的可更新能力。结果表明:研究区地下水可更新能力随埋藏深度的增大而减弱,中层地下水更新速率多为0.1%/a～1%/a,可更新能力较强;深层地下水更新速率绝大多数都小于0.1%/a,可更新能力较弱;盆地北区地下水可更新能力整体高于盆地南区。In order to reduce the pressure of water supply and accelerate the development of local economy and society,the authors studied the groundwater renewal ability of the Ordos Cretaceous groundwater basin,one of major water resources areas in the Ordos basin.The dynamics of DIC in groundwater is regarded as the same as groundwater approximately.This interprets that input and output of 14 C in groundwater system can provide information of its renewal ability.14 C isotopes are used to study the renewal ability of mediate and deep groundwater by the isotopic mathematic and physical model,and groundwater renewal rate is an indicator for evaluation.The results reflect that the groundwater renewal ability decreases with depth,the renewal rate of mediate groundwater in most part is 0.1%/a-1%/a,greater than that of deep groundwater with the renewal rate of less than 0.1%/a.The groundwater renewal ability in the northern part of the basin is greater than that in the southern part.

关 键 词：鄂尔多斯 白垩系地下水盆地 更新速率 14C 地下水 

分 类 号：P641.3[天文地球—地质矿产勘探]