物探方法在地下热水勘探中的应用

Apply Effect and Analysis of Geophysical methods for Groundwater Exploration

缺水地区需要寻找地下水,旅游开发有时需要寻找温泉,地球物理勘探也因此在这些方面发挥了重要的作用。通过阐述天然电场选频法在某地温泉勘探中的应用效果和异常成因的理论分析,结合作者多年的实践应用可知,地下含水构造体在地表会引起选频法明显的相对低电位异常和指针摆动信息,将该方法应用于湖南浏阳某地的温泉勘查中,当其它物探方法受场地环境限制的情况下,选频法在含水破碎带上方获得了明显的异常,钻孔验证结果也证明了天然电场选频法的有效性。在实践应用的基础上,作者进一步从麦克斯韦方程组出发,通过对均匀谐变电磁场中低阻水平圆柱体的感应场进行理论推导和模拟计算,说明天然电场选频法的异常成因主要是由二次感应电场所致。

Applied geophysics has acted as an important role in aspect of groundwater exploration in water lacking regions or hot spring prospection for tourism exploitation. The author presents application effects of natural electric field frequency selection method on hot spring exploration, and interprets formation mechanism of anomalies. According to the author＇ s practical experience in recent years, water - bearing structures bring on visible electric potential anomalies and the pointer swing for frequency selection method. This method has been used to prospect hot spring in a place of Liuyang city, Hunan province. When application effects of other geophysical methods are restricted by circumstances, obvious anomalies are obtained above water - bearing fracture zones by the frequency selection method. The borehole result testifies the validity of natural electric field frequency selection method.