渭河盆地隐伏断层的视电阻率特征

渭河盆地电测剖面显示，隐伏断层的破碎带上都呈现出视电阻率负异常．随着勘探深度的增加，异常的幅度也随之增大，破碎带宽度的轮廓也更加清楚．视电阻率异常点呈直线展布是确定隐伏断层走向和评价勘探结果准确度的标准．断层两侧视电阻率的差异反映了其两侧不同介质的电性差异，也是垂直断距的反应．断层破碎带上视电阻率负异常是由于丰富地下水所致

APPARENT RESISTIVITY CHARACTERS OF SUBSURFACE FAULTS IN THE WEIHE BASIN

The apparent resistivity on the fracture zone of buried fault in the Weihe basin shows always negative anomaly.The amplitude of anomaly increases and outline of fracture zone becomes more clear when the exploration depth is deepened.The linear distribution of anomaly points of apparent resistivity is a criterion for determining the strike of buried fault and evaluating the exploration result.Difference of apparent resistivity on both sides of fault shows the electrical difference of different materials on the both sides,indicating the vertical fault throw.The negative anomaly of apparent resistivity on the fracture zone of fault results from existence of rich underground water.