洪洞井水温梯度测量及动态分析

Water Temperature Gradient Measurement and Dynamic Analysis of Hongtong Well

山西临汾洪洞井是临汾市地震局直属地下流体物理观测井,通过水温梯度测量与分析认为:水温梯度变化分为明显的低、高、零、低梯度段,这与柱状图含水层分布高度吻合,其中水温梯度最高梯度段分析有深循环热水层流过,对该段上下两层的水都有加温,尤其是在200 m处水温交替剧烈,与梯度剧烈变化相吻合,水温梯度近于零的层段认为是由于冷热水交替剧烈造成水温变化较小;洪洞井水温传感器下放位置为温度梯度最大井段,该测段温度测项无同震效应,背景噪声较大,探头的下放深度需进一步试验确定.

Hongtong Well,which is located in Linfen of Shanxi Province,is directly subordinate to Linfen Seismological Bureau.It is an underground fluid physical observation well.According to the measurement and analysis of water temperature gradient,the change of temperature gradient obviously contains low,high,zero,and low gradient section,which is strongly aligned with the distribution of aquifer in the histogram.What’s more,the analysis of the highest gradient of water temperature gradient shows that when deep circulating hot water layers flow through,the water in the upper and lower layers of this section can be both heated,especially at 200 m,the water temperature alternates violently,which is consistent with the drastic change of gradient.However,the interval where the gradient of water temperature is close to zero is considered to have little change in water temperature due to the sharp alternations of hot and cold water.The setting position of the water temperature sensor in Hongtong Well is the section with the maximum temperature gradient.In this section,there is no coseismic effect in the testing of temperature,and there exists large background noise.Therefore,the depth of the probe’s setting needs to be further tested and verified.