断裂带同侧不同观测井水温变化特征

Water Temperature Variation Characteristics of Different Observation Wells on the Same Side of the Fault Zone

通过对位于断裂带同侧的晋7-1井与晋源井不同深度水温变化进行实验观测与对比分析,结果表明:①两口井在0~70 m温度梯度总体变化一致,井的深度不影响井的温度梯度,决定井温度梯度的是其所处位置的水文地质构造;②温度梯度越小,水温记录背景噪声越小,也就是说对于同一口井井底、正负温度转换带或者是恒温井这些温度梯度为零或近零点水温观测背景最小;③水温“潮汐”变化为次生变化,大小与水位“潮汐”相关,具有“潮汐”日变化的观测8层是温度梯度为零或近零点;④断裂带同侧由于观测井的深度不一致,不同井同一深度水温日变化存在一定差异;⑤观测井传感器所在位置的水温梯度是决定日变化形态的主要因素。

The water temperature changes of Jin7-1 well and Jinyuan well located on the same side of the Jiaocheng fault zone at different depths were observed and compared.The result shows that:1)the temperature gradient of the two wells is consistent in 0 m~270 m.The temperature gradient of the wells is not affected by the depth of the wells,but by the structural location.2)The smaller the temperature gradient,the smaller the background noise recorded by the instrument.That is,for the same well,the position where the temperature gradient is zero or near zero is a minimum background value of water temperature,like well-bottom、plus-minus temperature conversion band、thermostatic well.3)The tidal change of water temperature is secondary,and its range is related to the tidal change of water level.The observation layer with diurnal variation of tide is that the temperature gradient is zero or near zero.4)Due to the different depth of observation wells on the same side of the fault zone,there are some differences in daily variation of water temperature at the same depth in different wells.5)The water temperature gradient at the sensor position of the observation well is the main factor determining the daily variation pattern.