利用水动态深井进行井下地电场观测的可行性分析

A Feasibility Study on Geoelectric Field Observation by Using Water Dynamic Deep Well Stations

自然电场是一种物理意义比较明确,变化机理相对明晰的地球物理场,其布极测量也较为简便。通过深井进行井下自然电位观测,在相同测量条件下,比深井电阻率观测更容易避开地表因素干扰层。利用水动态深井网点进行自然电位观测,不需要增加大的人力和财力投入,不影响同一口井内的高精度水温测量,如果将物理意义不同的水位、水温和自然电位同用一井,形成综合观测网,对地震预报尤其是短临跟踪预报更具有积极意义。

Natural electric field is a geophysical field which has definite physical meaning and relatively clear change mechanisms. Its electrode layout measurement is also comparatively simple. Compared with deep well resistivity observation, the use of deep wells to observe natural potential is easier to avoid surface disturbance layer under the same measurement condition. Apart from that, it doesn＇t need massive investment of manpower and financial resource and it doesn＇t affect high-accuracy water temperature measurement in a deep well. If water level, water temperature and natural potential with different physical meanings are measured in the same well forming an integrated observation network, which will have a positive influence on earthquake prediction,especially short-term and impending earthquakes.