地下水年龄及其在含水层封闭性评价中的应用  

Groundwater age and its application for evaluating the sealing capability of aquifer

作　　者：赵雅静 黄天明[1,2] 昝朝耀 龙吟 李义曼 张艳[1] 祁生文[1,2] 庞忠和[1,2] ZHAO Ya-jing;HUANG Tian-ming;ZAN Chao-yao;LONG Yin;LI Yi-man;ZHANG Yan;Qi Sheng-wen;PANG Zhong-he(Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国科学院大学地球与行星科学学院,北京100049

出　　处：《矿物岩石地球化学通报》2024年第3期489-501,I0001,共14页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金资助项目(42172277,42141009);科技部第二次青藏高原综合科学考察研究项目(2019QZKK0904);中国科学院地质与地球物理研究所重点部署项目(IGGCAS-202204)。

摘　　要：针对目前地下水年龄和地下水滞留时间概念混用、地下水年龄分类缺乏依据及地下水定年方法复杂多样的问题,本文给出了地下水年龄和地下水滞留时间的严格定义,考虑不同定年方法的测年范围以及人类活动影响程度等因素,进行了地下水年龄的合理分类。本文还总结了已有地下水的定年方法,主要包括物理上的水动力模拟计算方法和化学上的示踪剂方法,提出了不同定年示踪剂存在的主要问题以及定年方法选择的原则。最后以鄂尔多斯高原为例,利用地下水年龄判断含水层封闭性,提出了CO_(2)地质封存工程选址的地下水年龄标准(大于3万年),评价结果表明,除补给区和排泄区外,中部的白垩系地层以下满足CO_(2)相态要求、有连续盖层的绝大多数区域满足CO_(2)地质封存的安全要求。In view of various current problems including the mixly used concepts of groundwater age and groundwater residence time,the lack of basis for groundwater age classification,and complex and various groundwater dating methods,in this paper,we have given strict definitions of groundwater age and groundwater residence time,have carried out a reasonable classification of groundwater ages based on the consideration of factors including the dating ranges of different groundwater dating methods and the influence degrees of groundwater by human activities,have summarized existed groundwater dating methods including the physical hydrodynamic simulation calculation method and the chemical tracer method,and have pointed out main existed problems of different dating tracers and the selection principles of different dating methods.Taking the Ordos Plateau as an example,we have evaluated the sealing capbilities of aquifers in the area by using the groundwater dating ages,and have proposed the groundwater age standard(>30,000 years)for the site selection of CO_(2)geological storage project.The evaluation results show that,except the recharge and discharge areas,the strata below the Cretaceous strata in the central Ordos Plateau meet the requirements of CO_(2)phase and most areas with continuous covering layer meet the safety requirements of CO_(2)geological storage.

关 键 词：地下水年龄 地下水定年 同位素 含水层封闭性 CO_(2)地质封存 

分 类 号：P641[天文地球—地质矿产勘探]