摘要
地热井的观测规范要求尽可能将水温传感器放置在井下深处,一般放置深度应当大于100 m,小于200 m。然而,近几年的观测结果表明,水温传感器的放置深度对水温动态特征的影响较大。在多数观测井中,同井水温与水位的时值动态、潮汐效应、同震响应及震后阶变等动态特征的相关性或一致性,多与水温传感器的放置深度有关。本文主要探讨了传感器放置深度对水温动态特征的影响,水温传感器放置在观测含水层中,都受井—含水层间水流运动的影响,会造成水温动态随井水位变化而变化;当放置在观测含水层下部时,水温动态则不受井水位变化的影响,多表现为动态相对稳定。其原因是水温动态的形成受水热动力学与地热动力学两种不同机制的控制,此外,井—含水层系统的条件也会产生影响。
According to observation specifications of geothermal wells, the water temperature sensors should be placed as deep as possible. Generally, the depth is more than 100 m and less than 200 m. However, it is observed that the placement depth of water temperature sensors has a significant effect on the dynamic characteristics of water temperature observation. In most observation wells, the dynamic characteristics between water temperature and water level in the same well, such as time dynamics, tidal effects, co-seismic responses and post-earthquake step-changes, show high correlations or consistencies, which is usually relevant to the placement depth of water temperature sensors. In this paper, the dynamic characteristics of water temperature affected by sensor placement depth is discussed, when the water temperature sensor is placed in the observation aquifer, it is affected by the flow movement between the well and the aquifer, which will cause the water temperature changes with the change of the well water level;when placed under the observation aquifer, the water temperature is not affected by the change of well water level, and most of the dynamic is relatively stable. This is mainly because the formation of water temperature dynamics is controlled by two different mechanisms, hydrothermal dynamics and geothermal dynamics, and the conditions of the well-aquifer system also play a role.
作者
陈其峰
车用太
刘允
冯恩国
温丽媛
CHEN Qi-feng;CHE Yong-tai;LIU Yun;FENG En-guo;WEN Li-yuan(Liaocheng Earthquake Monitoring Central Station of Shandong Earthquake Agency,Liaocheng 252000,China;Institute of Geology,CEA,Beijing 100029,China;Dalian Earthquake Station,Liaoning Earthquake Agency,Dalian 116000,China)
出处
《地震》
CSCD
北大核心
2022年第1期169-180,共12页
Earthquake
关键词
水温
动态特征
传感器放置深度
影响机理
Water temperature
Dynamic characteristics
Sensor placement depth
Effect mechanism
