祁连山断裂带中东段地下水地球化学特征研究

Research on the Hydrogeochemical Characteristics of Groundwater in the Mid-eastern Segment of Qilianshan Faults Zone

摘要:

祁连山断裂带是中国西部地震活动最强烈的地区之一。本文应用Aquachem5.1对该断裂带中东段10口井水进行了水化学分析;同时利用Phreeqc软件对地下水化学组分和饱指数SI值进行了模拟计算;并结合氢氧和氦同位素组成特征初步分析了该断裂带地下水成因、水质类型、循环速度及循环深度。研究表明祁连山断裂中东段地下水均为大气成因,总体上体现为循环深度小、滞留时间短、水-岩反应程度较弱等特点,其化学活动性在空间上具有西弱东强分布特征。这一结论为今后进一步研究地下流体地震前兆异常提供了依据。

Abstract:

Qilianshan fault zone is one of the stronge seismicity regions in weatern China.In this paper,the typers,cycle depth and speed of groundwater in the faults zone are discussed through calculated the saturation index SI,the isotope ratio of Hydrogen-Oxygen and 3He/4He ratio by Aquachem 5.1 and Phreeqc software.The results show that all of the groundwater samples in the zone have the characteristics of atmosphere causes,small cycle depth,short residence time,and weak water-rock reaction.This research conclusion provides the basis date for earthquake prediction in future.