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在胶莱盆地,其红层所属地层岩性为粉砂岩、泥岩,含、透水性较差,查找低阻断裂构造是其地下水勘探的唯一途径。而红层地区的压扭性断层,会因挤压密实的断层泥存在,导致单纯利用低电阻率参数判定地下水的赋存位置出现差错。根据该区地下水的自然电位异常值约为-100mV、含水破碎砂岩极化率大于2%、衰减度D大于50%的特点,提出了自然电位观测法与激发极化电测深法相结合的组合方法。即利用自然电场法进行剖面测量,判定含水异常位置,然后利用激发极化电测深法准确判定地下水所在层位及埋深。在胶州市某镇政府水源勘探中,利用该组合方法,成功的圈定了3个井位,并在预定的深度内打出了单井出水量为1000t/d的优质井。
In the Jiaolai Basin, the lithology of the red beds belongs to siltstone, mudstone and mudstone with poor permeability. Finding low-resistance fractures is the only way of groundwater exploration. However, the crushed faults in the red zone are likely to exist due to the thick compacted mud, which leads to the error of the occurrence of groundwater simply by using the low resistivity parameter. According to the characteristic that the natural potential of groundwater in this area is about -100mV, the polarizability of water-bearing fractured sandstone is more than 2%, and the decay degree D is more than 50%, a combination of natural potential observation and excitation polarization electric sounding is proposed method. That is, using the natural electric field method to measure the profile and determine the location of the anomalous water, and then accurately determine the horizon and depth of the groundwater by using the excitation and polarization sounding sounding method. In Jiaozhou City, a town government water exploration, the use of the combination of methods, successfully delineated the three wells, and within a predetermined depth shot of a single well water output of 1000t / d of high quality wells.