将北京昌平兴寿镇地震监测井同一型号水温传感器分别置于井下400 m、600 m、700 m展开对比观测，就水温数据的变化幅度、差分日变差、均方差和同震响应特征进行差异性分析，以揭示井下不同深度处环境扰动信号的强弱及对水温观测效能的影响。分析发现，传感器置于井下600 m，受观测含水层流体渗入影响，水温数据变化平稳，异常信息更易于识别；传感器置于井下400 m、700 m，受到水温梯度值相对大和距离观测含水层顶板过长的影响，水温数据所受扰动信号增强，异常信息被湮没而不易识别。为提高水温观测效能，应结合井孔条件，综合评价水温传感器的有效置深。
The same type of water temperature sensors in the Xingshou seismic monitoring well were placed at 400 m, 600 m, and 700 m underground, respectively, for comparative observation. The differences in the amplitude of change, differential daily variation, mean square error, and co-seismic response characteristics of water temperature data were analyzed to reveal the strength of environmental disturbance signals at different underground depths and their impacts on the water temperature observation efficiency. The analysis shows that the sensor placed at 600 m underground is affected by the infiltration of fluids in the observed aquifer, and the water temperature data changes smoothly, making the abnormal information easier to identify. The sensors placed at 400 m and 700 m underground are affected by the relatively large water temperature gradient and the long distance from the observation aquifer roof, and the water temperature data is enhanced by the disturbance signal, making the abnormal information buried and difficult to identify. In order to improve the efficiency of water temperature observation, the effective depth of the water temperature sensor should be comprehensively evaluated according to the conditions of the well.
2023,44（6）: 78-85 收稿日期：2023-7-20
DOI：10.3969/j.issn.1003-3246.2023.06.012
基金项目：2023年度北京市地震局面上科技项目（项目编号：BJMS-2023008，BJMS-2023009）
作者简介：韩孔艳（1982—），女，高级工程师，主要从事地下流体监测与研究工作。E-mail：hankongyan@bjseis.gov.cn
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