Example and analysis of abnormal verification of water thermometer observation data in Yongqing well
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摘要: 以永清地震观测井水温仪观测数据出现的异常为例，通过同层水温仪对比观测，断电实验以及注水实验等现场核实的方法，详细分析了水温观测数据的可靠性，提出了流体观测井异常核实工作的一般流程与解决办法，为地震台站观测数据异常的现场核实提供了可靠、有效的方法，并找到产生异常的真正原因。Abstract: Taking the abnormal observation data of water temperature instrument in Yongqing seismic observation well as an example, the reliability of water temperature observation data is analyzed in detail by means of comparative observation of water temperature instrument in the same layer, power failure experiment and water injection experiment. The work flow and solution of abnormal verification of fluid observation well are put forward. It provides a reliable and effective method for verifying the anomalies of observation data in seismic stations, and finally finds the real reason of anomalies.
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图 1 台站位置和周边构造（a）及永清井井孔柱状图（b）
Figure 1. Station location and surrounding structure （a） and well hole histogram of Yongqing well （b）
图 2 永清井水温2017—2020年异常变化5日均值一阶差分曲线图
Figure 2. 5-day mean first-order difference curve of abnormal water temperature in Yongqing well from 2017 to 2020
图 4 永清台流体观测系统示意图
Figure 4. Schematic diagram of fluid observation system at Yongqing station
图 5 2020年4月1日—5月11日永清井水温与同井其他测项异常时段对比曲线图
Figure 5. Comparison curve of water temperature in Yongqing well from April 1 to May 11, 2020 with other abnormal periods measured in the same well
图 6 同层位水温异常4月1日—5月13日对比观测曲线图
Figure 6. Comparison observation curves of water temperature anomalies at the same horizon from April 1 to May 13
图 7 2020年5月11日注水实验示意图
Figure 7. Schematic diagram of water injection experiment on May 11, 2020
图 8 断电实验电瓶电压变化曲线图
Figure 8. Voltage variation curve of battery in power failure experiment
表 1 断电实验3块电瓶电压值
Table 1. Voltage values of the three batteries in the power failure experiment
时间 U1 /V U2 /V U3 /V 3:30(断电) 13.562 13.314 13.377 4:00 12.917 12.897 12.930 4:30 12.895 12.861 12.921 5:00 12.884 12.844 12.912 5:30 12.868 12.837 12.894 6:00 12.865 12.838 12.893 6:30 12.871 12.849 12.898 7:00 12.877 12.855 12.901 8:00 12.880 12.859 12.905 8:05（合闸） 13.481 13.377 13.585 8:30（断闸后20分钟） 12.890 12.864 12.912 9:00 12.881 12.861 12.906 9:30 12.881 12.861 12.905 10:00 12.880 12.860 12.905 10:30 12.880 12.860 12.904 11:00 12.880 12.859 12.904 11:30 12.880 12.855 12.904 12:05 12.880 12.855 12.903 12:25 12.870 12.870 12.903 12:28（合闸） 13.373 13.300 13.425 12::29 13.480 13.550 13.460 12:38 13.653 13.540 13.455 
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