浅议电法找水中的一个误区

在河北GY北部山前地带及河北TX西北部山区等环境条件下,采用电法找水,不应过分依赖于低阻岩带或灰岩溶隙选定井位,特别是电测深H型曲线,如低阻出现深度较浅,且未出现低阻平直段,曲线尾部又近于45°渐近线,则可能是浅层的亚粘土、砂质粘土形成的,不具备成井条件;而A型曲线如在深部(200～350m)出现高阻平直段,则可推测为基岩深部的脉状裂隙水反映。实践证明采用这种方法确定钻井点位是可行的,对于在我国北方寒武、奥陶系地层中寻找地下水资源,具有一定的参考价值。

Discussion on the Misunderstanding in Electric Method Water Source Prospecting

When the electric method water source prospecting is used under the geologic environmental condition of northern GY foreland and northwestern TX mountainous areas in Hebei Province,the water well locating shall not put undue stress on conductive formation or limestone karst fissures,especially the H-type curve appears.If the conductive formation is shallow,no flat curve occurs,and the curve's rear part nearly a 45o asymptotic line,that can be formed by shallow clayey soil or sandy clay and gives a hint of no water there;while an A-type high resistivity flat curve appears at deep part(say 200-350m) that can be deduced a reflection of bedrock vein fissure water.Practices demonstrated that the method is feasible in well site locating and has referential importance in northern China Cambrian and Ordovician strata groundwater prospecting.