砂页岩地区的富水带激电异常研究

Study on Abnormal Induced Polarization of Groundwater-rich Zones in the Sandy Shale Areas

在砂页岩地区进行富水带激电测试,取得了丰富资料,剖析了砂页岩地区的断裂带在视电阻率等值线断面图上的表现形态,给出了详细的形态描述。以断裂带的存在和断裂带充水为出发点,确定了富水带的激电异常判据。对探测数据进行分析时参照该判据,确定了地下岩性组成及富水带。通过打井结果表明,分析得出的结论与实际情况吻合良好,由此证明该判据实际可行。

Abstract The groundwater-rich zones were exploited in the sandy shale areas by induced polarization method, and the rich data were obtained. The display morphologies of the fracture zones of sandy shale was analysed on apparent resistivity contour lines and described in detail. With the existence of fracture zones and being full of water as precondition, the criterion of abnormal induced polarization was confirmed. The exploration data were analysed according to the criterion, and the underground lithology constitution and groundwater-rich zones were confirmed. An excellent agreement was found between result obtained by analyzing and actual instance, and the criterions were confirmed to be feasible.