福建仙游郊尾井水位、水温异常成因探讨
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摘要
通过对仙游郊尾井观测系统工作环境和工作状态的检查、观测环境排查、水下电视探测、抽水实验等现场工作,以及对干扰井和观测井的水样进行氢氧同位素和水质成分分析,认为仙游郊尾井水位、水温资料自2017年7月5日开始出现的同步异常现象是附近新打的机井干扰所致,不是地震前兆异常。因打井对基岩的压力增大,使得含水带内裂隙增大,导致出水量增多,同时新打的井破坏了含水带原有的平衡,在多种因素综合影响下,深部水量加大,水位大幅度上升;深部的高温水上涌,使得120 m处的水温升高。同时干扰机井抽水,造成观测井水位、水温出现同步下降。
On July 5~(th), 2017, abnormal changes appeared on the water-level and temperature of Jiaowei observation well, Xianyou. The factors are systematically investigated by the researchers of Fujian Earthquake Agency at the first time. After checking the working status of observing systems and on-site problems, doing underwater photographing work and pumping experiments, analyzing hydrogen and oxygen isotope and water quality of interference well and observation well, the results show that the synchronous abnormal phenomenon is caused by the new dig well, and it is not an earthquake precursors anomaly. Since digging a well gains the rock pressure, the fracture of water-zone increases, at the same time, the new well destroys the balance of water-zone, lead to the increase of deep outlet water. The resist effort of the concrete block at 120 m deep makes the deep water upwelling suddenly, which leads to the sharp rise in water level and the increase of temperature. the synchronous drop on the water-level and temperature are caused by the pumping of interfere well.
On July 5~(th), 2017, abnormal changes appeared on the water-level and temperature of Jiaowei observation well, Xianyou. The factors are systematically investigated by the researchers of Fujian Earthquake Agency at the first time. After checking the working status of observing systems and on-site problems, doing underwater photographing work and pumping experiments, analyzing hydrogen and oxygen isotope and water quality of interference well and observation well, the results show that the synchronous abnormal phenomenon is caused by the new dig well, and it is not an earthquake precursors anomaly. Since digging a well gains the rock pressure, the fracture of water-zone increases, at the same time, the new well destroys the balance of water-zone, lead to the increase of deep outlet water. The resist effort of the concrete block at 120 m deep makes the deep water upwelling suddenly, which leads to the sharp rise in water level and the increase of temperature. the synchronous drop on the water-level and temperature are caused by the pumping of interfere well.
引文
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[3]孙小龙,刘耀伟,宴锐.云南姚安井2009年后水位下降的成因分析[J].地震学报,2013,35(3):410-420。
[4]廖丽霞,刘其寿,郑永通,等.福建闽清梅埔井水位异常判识[J].地震地磁观测与研究,2010,31(4):51-56.
[5]廖丽霞,秦双龙,叶威.泉州一号井水位异常的调查与研究[J].内陆地震,2013,27(1):67-73.
[6]陈莹,朱石军,陈小云,等.福建省闽清梅埔井水位固体潮畸变成因探讨[J].地震地磁观测与研究,2008,29(5):36-40.
[7]张淑亮,车用太,范雪芳,等.介休井水位异常的调查与分析[J].地震研究,2002,25(4):320-327.
[8]张磊,刘耀伟,孙小龙,等.基于水化学和物理方法的井水位异常分析[J].地震地质,2014,36(2):513-522.
[9]苏鹤军,张慧,史杰.祁连山断裂带中东段地下水地球化学特征分析[J].西北地震学报,2010,32(2):122-128.
[10]韩晓雷,哈里白,戴勇,等.通辽井水位和水温动态变化影响因素分析[J].华南地震,2017,37(1):49-53.