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近几年来,我们在吉林省长白山、内蒙古大兴安岭的火山岩分布地区,为城镇和工矿企业找水,做了大量电法勘探工作,取得了较为显著的效果。本文系电法勘探——主要是电测深法在火山岩地区找水实践的体会。一、火山岩地区的地电特征一般来讲,在火山碎屑岩中,硬脆岩石(凝灰熔岩)的电阻率高于300欧姆一米;软塑性岩石(凝灰质砂砾岩),一般较低,在30～300欧姆一米;而玄武岩的电阻率10~2～10~5欧姆一米,变化幅度较大。这说明,虽然同一岩石,其电阻率值却不同。岩石电阻率的变化特点,即岩石本身的电性变化规律,在很大程度上取决于裂隙的
In recent years, we have found water for cities, towns and industrial and mining enterprises in the Changbai Mountain of Jilin Province and the Daxinganling volcanic rock distribution area in Inner Mongolia. We have done a lot of electrical prospecting work and achieved remarkable results. In this paper, electrical prospecting - mainly the electric sounding method to find water practice in the volcanic area of experience. Geoelectric characteristics of volcanic areas In general, the resistivity of hard and brittle rocks (tuff lava) is higher than 300 ohm-1m in volcaniclastic rocks; soft-plastic rocks (tuffaceous conglomerates) are generally low , 30 to 300 ohms a meter; and basalt resistivity of 10 ~ 2 ~ 10 ~ 5 ohm-meter, a larger change. This shows that, although the same rock, the resistivity value is different. The variation of rock resistivity, that is, the electrical variation of rock itself, depends largely on the fracture