垂向电导度的测量及在水位异常判别中的作用

MEASUREMENT OF VERTICAL CONDUCTIVITY AND ITS APPLICATION IN RECOGNITION OF ABNORMAL WATER LEVEL IN SHUANGQIAO AND DONGTAIZI WELLS

为剖析咸水井水位异常,我们对位于唐山地震区附近的双桥1号井、双桥2号井及东台子井进行了多次井内垂向电导度的测量.在1991年10月5日宁河M_L4.6级地震及1992年7月22日宁河M_L4.9级地震前井下水电导度特别是含水层部位水电导度都曾出现过高值异常,这对于判别水位异常是由于咸水层压力变化还是外来水的侵入是一种行之有效的简便的监测方法.

In order to analyse the abnormal water level in saltwater well, we measured vertical conductivities for many times in wells of Shuangqiao No. 1, Shuangqiao No. 2 and Dongtaizi which all lie near Tang-shan seismic region. Before Ninghe ML4. 6 earthpuake on October 5, 1991 and Ninghe ML4. 9 earthquake on July 22,1992, the water conductivities in the wells, especially in aquifer position,showed high abnormal values. This is an effective and simple monitoring method for recognizing water level anomaliesinduced either by water pressure changes of saltwater layer or by the ingress of water from otherplaces.