The Calibration of an Array Induction Logging Tool in half-space

Array induction logging tools are currently relatively widely used resistivity logging tools. The scale of array induction logging tools includes workshop scale and half space scale. The main purpose of the workshop scale is to use the ring scale to determine the instrument constant (K value). The half-space scale determines the system error of the instrument coil, that is, the basic value. The longest sub-array of the array induction logging tool MIT has a detection depth of 2.5m in the air. Signals over 14m account for 10%, and signals over 28m account for 5%. The ground conductivity must be considered during the half-space calibration process. Influences. This topic studies the method of eliminating grounding conductivity and coil system errors. The completion of the subject will be of great significance to the accurate calibration of the instrument measurement signal.