摘要
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 t he Jiaolai Basin, red beds are composed of sihstone, mudstone with rather poor water-bearing property and permeability, thus to find out conductive faulted structures is the only way in groundwater exploration. To determine groundwater hosting horizon may be mistaken if using only resistivity parameters because of compressed compact fault clay existing in compressoshearing faults in red beds area. Based on groundwater characteristics of self potential anomalous value about -100mV, water bearing fractured sandstone polarizability 〉2%, decay rate D 〉50% in the area, put forward a combination method of spontaneous potential and induced polarization electric sounding. That is to use natural electric field method carries out profile survey to determine waterbearing anomalous horizons, then to use induced polarization electric sounding to determine groundwater horizons and depths correctly. During a water source exploration for a town government of Jiaozhou City, by the use of the combination method delineated 3 well sites successfully, and drilled a high performance well with specific capacity of 1000t/d at predicted depth.
出处
《中国煤炭地质》
2008年第11期69-71,87,共4页
Coal Geology of China
关键词
地下水
红层
自然电位法
激发极化法
联合剖面法
胶莱盆地
groundwater
red beds
spontaneous potential method
induced polarization method
combined profiling method
Jiaolai Basin
