含水层淤埋流体井技术改造及观测效果

Technological reconstruction and observation effect of water well under a condition of silting aquifer

平谷马坊井成井于2008年,是北京北部地区重要流体观测井,井孔结构完整,但水位、水温映震不灵敏,观测信息有限。为提高观测数据质量,对井孔进行射孔改造,增加含水层厚度,洗井及清淤施工增大含水层渗透性。改造后观测井水位具有明显潮汐效应,水温观测数据内在质量明显提高,其映震能力加大。平谷马坊井改造效果良好,为流体观测同类井孔的重新利用提供了借鉴。

Mafang well was built in the resent year,and the sidewall structure of the well is integrity.However,the reflection of earthquake by the water level and water temperature data is not sensitive,and the observed information is limited.In order to improve the quality of observed data,the well was reformed with flushing,dredging and increasing the aquifer thickness,which made the permeability of aquifer increased.After the reform,the water level has obvious tidal characteristics.The quality of observation data has been improved.The seismic response capacity of observation data has also become more sensitive.These indicate that the reform of the well bore has played a good role and provides a reference for the reutilization of earthquake observation well.