辽宁阜新井水温破年变与加速下降原因分析

Cause Analysis of the Downward Annual Variation of Water Temperature in Deep Wells in Liaoning Fuxin

摘要:

阜新井水温于2015年8月出现破年变变化，至2016年3月水温出现加速下降现象，最大降幅达7.2‰℃，距水温井约16m处的体应变井辅助水位亦出现同步下降变化。通过对水温井观测系统、区域地质特征和周边环境等进行调查发现，水温井东北约1km处的新打深水井大量抽水可能是造成水温及水位下降变化的原因。将新井抽水时间与阜新井水温及其他前兆测项观测数据进行对比分析，结果显示水温、体应变和钻孔水位等数据的变化与新打井在成因、空间、时间和强度上都存在明显的相关性。故阜新井水温及辅助水位同步变化为附近新井抽水干扰所致，排除为地震前兆异常的可能。

Abstract:

The annual variation of water temperature in the Fuxin well accelerated since August 2015,and the max amplitude was about 7.2‰℃. At the same time,the tricstrain well 15 meters from the water well also had descent variations for the water level. Checking with the observation system and analyzing the regional construction characteristics and surrounding environment,we find that there is a new deep well located in the northeast about 1km,which has continuous pumping that may lead to the decrease for water temperature and water level. Comparing the pumping time of the new well with the precursory data,we find that the water temperature,the volumetric strain and the water level have the correlation with the new well in terms of cause,spatial and temporal factors and signal intensities. These result shows that the changes of the temperature of the well and the water level of the volumetric strain well are not caused by tectonic stress of the earthquake preparation,but by the water pumping interference of the nearby new well.