Abstract: Much interference has been found in seismic subsurface fluid behaviors. The interference of subsurface water resource exploitation is very universal, and that of hot water exploitation is severe. It affects the observation on subsurface fluid. So, the influence of ground water exploitation on subsurface fluid behaviors should be observed, investigated and researched. Based on hydro-geological settings, exploitation history and actualities of the Jingbei geothermal field, the influences of hot water production on subsurface fluid behaviors in observation wells, which have different hydro-geological settings and different intervals from exploitation wells, are analyzed. Discrepancies of the influence on different observation items are also discussed. Our result shows that disturbance distance of hot water exploitation on subsurface fluid behaviors is within 5km in the Jingbei geothermal field, and the influence on behaviors of the observation wells nearby the water-transmitting fault is most notable. As for the effects on observation items, those on water level and temperature rank first, the escape gas (Rn, Hg) comes second, and that on soil gas (CO₂) is inconspicuous.

Key words: hot water exploitation, subsurface fluids, Jingbei geothermal field

摘要： 在地震地下流体动态研究中发现有多种干扰,特别是地下水资源开发的干扰较为普遍,地下热水开发的干扰较为严重,影响地下流体动态监测的效果,因此需要关注、调查与研究地下水开采对地下流体动态的影响问题。作者在研究京北地热田区水文地质条件及热水开采的历史与现状的基础上,重点分析了热水开采对不同水文地质条件与离开采井距离不等的观测井地下流体动态的影响及这种影响在不同测项上表现的差异。研究结果表明,在京北地热田区热水开采对地下流体动态的影响距离为5km,对位于导水断裂带附近的观测井动态影响最为明显;就测项而言,对水位与水温动态的影响最为明显,其次是逸出气(Rn,Hg)动态的影响,对土壤气(CO₂)动态的影响不明显。

关键词: 热水开采, 地下流体动态, 京北地热田