The method can not only research low-frequency current and its character of logging through metal casing but also confirm the method of measuring electric resistivity of stratum through metal casing.

• 该方法不仅可以用来研究套管井低频电流及其特性,而且还可以用来确定过套管地层电阻率测量方法和套管、水泥环等对测井的影响及其校正方法。