Method for investigating the conductivity of layered terrain

摘要

The conductivity of horizontally layered terrain is investigated by using spaced transmitter and receiver coils above the terrain, the transmitter coil frequency being low enough relative to the coil separation and the terrain conductivity so that the quadrature component of the received signal is essentially the sum of non- interactive components attributable to the separate layers and directly proportional to the conductivity of those layers, a plurality of measurements being made using different measurement parameters so that unknown thickness and/or conductivity parameters of the layers may be ascertained.