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Title:: Hydrogeo Chemical Characteristics of Groundwater in Seismic Observation Wells in Zhaotong Area

作者:: 胡小静¹; 付虹^1; 张翔¹; 何德强²; 周晓成³; 李丽⁴; (1.云南省地震局,云南昆明 650224; 2.昭通市防震减灾局,云南昭通 657099; 3.中国地震局地震预测研究所,北京 100036; 4.山西省地震局,山西太原 030021)

Author(s):: HU Xiaojing¹; FU Hong¹; ZHANG Xiang¹; HE Deqiang²; ZHOU Xiaocheng³; LI Li⁴; (1.Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)(2.Zhaotong Earthquake Agency,Zhaotong 657099,Yunnan,China)(3.Institute of Earthquake Forecasting,China Earthquake Administration,Beijing 100036,China)(4.Shanxi Earthquake Agency,Taiyuan 030021,Shanxi,China)

Keywords:: seismic observation wells; hydrochemical characteristics; Zhaotong area

摘要:: 对昭通地区12口流体观测井及其周边5个地表水体进行取样测试,分析其水化学组分和氢氧同位素,确定该地区流体观测井的地球化学背景特征,为该区流体测项的跟踪分析提供基础支撑。水岩平衡结果显示:相较于其它观测井,昭阳一中井地下水水岩平衡状态更接近于部分成熟水,表现为地下水补给过程缓慢,水岩作用程度较高; 其余观测井均处在未成熟水阶段,表现出补给路径较短,水岩相互作用较弱等特点。氢氧同位素组成显示:研究区内大多数流体观测井补给源均为大气降水,但补给方式略有差异。水化学组分演化过程显示:自2014年以来,大多数井含水层水体未发生新的水岩作用过程,并且与其附近的河流水力联系密切。

Abstract:: In order to discuss the hydrogeochemical background seismic observation wells in Zhaotong area and provide basic support for judging seismic chemical anomalies of the groundwater,we collected 17 water samples from 12 seismic observation wells and 5 surface water bodies,tested and analyzed the chemical components and hydrogen and oxygen isotopes of groundwater. The results of water-rock balance results revealed that the groundwater in the Zhaoyang No.1 Middle school well was characterized with long and slow recharge process,strong water-rock reaction,meaning partial equilibrated water,the other observation wells were classified as immature water,which were characterized with short recharge process and weak water-rock reaction. The isotope data of hydrogen and oxygen indicated that most of the seismic observation wells in the study area were originated from the atmospheric precipitation,and there were slightly different in the recharge modes. The evolution of chemical compositions of groundwater showed that most seismic observation wells had not experienced new water-rock reactions since 2014 and were closely related to the flowing river by 100 m in hydraulic connection.