A method for measuring Earth conductivity in non-uniform stratum

Based on the concept of apparent Earth conductivity (σ_k), this paper provides a point of view that σ_k depends on the ρ_k value measured from only a power-supply polar distance (AB) by the four-electrode method, then an AB polar distance template for measuring σ_k in the non-uniform stratum is developed. The test results prove that the new method is feasible in the aspect of technology, and it has the significance of obviously improving work efficiency and working quality.