海南琼海加积井水位水温同步上升后转平的异常成因初探-华南地震

文章信息/Info

Title:: Preliminary Study on the Abnormality Causes of Turning Flat after Synchronized Rise of Water Level and Temperature in Qionghai Jiaji Well, Hainan Province

Author(s):: XIE Xiaojing; SU Rongtuoya; ZHANG Fan; SUN Sanjiang; Hainan Earthquake Agency，Haikou 570203，China

Keywords:: Hainan Jiaji; Rise of water level and temperature; Cause of anomaly

摘要:: 2017年8月中旬至11月底琼海加积井水位水温同步大幅上升后至今呈转平形态的异常现象，通过开展井孔周边环境干扰的调查、井孔水体化学组分的分析、井孔构造的影响分析、周边观测井水位水温资料的对比分析以及区域构造活动的分析等工作，认为加积井水位水温的大幅上升后转平的现象非地球物理异常，推测原因应是观测段内深部含水层水补给量的增大上涌导致观测井水位水温同步上升，之后逐渐达到平衡，转而在高值的水平上呈平稳形态。而深部含水层水量补给增大的来源可能是观测井深110m以下至井底观测段内含水带揭露处井壁坍塌渗漏所致；也可能是其他的干扰所致，但具体的干扰源还有待继续核实。

Abstract:: From mid-August to the end of November 2017，the water level and temperature of Qionghai Jiaji well have risen sharply at the same time, and the abnormal phenomena have turned to flat. Through the investigation of the environmental disturbance around the well，the analysis of the chemical composition of the water body in the well，the analysis of the influence of the well structure，the comparative analysis of the water level and temperature data of the surrounding observation wells and the regional tectonic activity，the abnormal phenomena have been observed. Dynamic analysis shows that the phenomena of water level and temperature of Jiaji well rising sharply and then turning flat are not geophysical anomalies. It is presumed that the reason is that the increase of water recharge from deep aquifer in observation section causes the water level and temperature of observation wells to rise synchronously，and then gradually reach equilibrium, and then turn to a stable state at the high level. The increase of water recharge in deep aquifer may be caused by borehole collapse and seepage at the exposed aquifer zone from the observation well depth below 110 m to the bottom of the well. It may also be caused by other disturbances，but the specific disturbance sources need to be further verified.