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实测资料表明,二次电场衰减时与视电阻率关系点分布区的下限存在正向密切区间、反向密切区间和不密切区间,即衰减时与视电阻率关系十分密切。忽视视电阻率的变化,有可能造成激电找水效果上的失误。针对衰减时与视电阻率关系的区间特性,我们采用“相对衰减时”的概念作为激电找水的含水因素(相对衰减时SR＝S/ s)。采用该参数的实际意义在于反向密切区间突出了含水异常,正向密切区间消除因极距增大引起的非水异常。因此,相对衰减时在研究山区地下水的富集情况时灵敏度较高。应用相对衰减时法在不同水文地质条件的山区找水中,取得了较好的效果,特别是在我国著名的玫瑰泉地下水工程中,在电阻率法和常用的衰减时法解释推断有困难时,能比较准确地确定了富水区,成井后获得水量6万t/d,建成大型农业地下水源地。
The measured data show that the lower limit of the distribution point of the apparent resistivity at the time of secondary electric field decay exists in the positive close interval, the reverse close interval and the non-close interval, that is, the apparent resistivity is closely related to the attenuation. Ignoring the apparent resistivity changes, it is possible to cause the impact of water to find the effect of the error. For the interval characteristics of apparent resistivity at decay, we use the concept of “relative decay” as the water factor (SR = S / s for relative decay) of an electroforming water. The practical significance of using this parameter lies in that the reverse close interval highlights the water anomalies and the positive close interval eliminates the non-water anomalies caused by the increase of the polar distance. Therefore, relative attenuation is of high sensitivity when studying the enrichment of groundwater in mountainous areas. The relative attenuation method is applied to find water in mountainous areas with different hydrogeological conditions and good results are obtained. Especially in the well-known Rose Springs groundwater project in China, when the resistivity method and the commonly used decay method have some difficulties in explaining and inferring, Can more accurately determine the water-rich area, after the completion of wells received 60,000 t / d of water, built a large source of agricultural groundwater.