FIELD: physics.
SUBSTANCE: first real impedance between a given transmitter-receiver pair is measured when a logging device is at a first height over the ground. Second real impedance between a given transmitter-receiver pair is measured when a logging device is at a second height over the ground. The difference between the measurements is calculated. Impedances modelled for the first and second height are calculated using direct models of layers for the electrical conductivity range of the layer. The difference between the modelled impedances is calculated. A correlation function between the modelled difference and one of the modelled impedances is determined. A background signal in the real impedance is determined using the real difference measurement and the correlation function. The probe error is determined by subtracting the background signal from the real impedance corresponding to the selected modelled impedance.
EFFECT: possibility of using induction logging devices and distribution-based devices with different number of coils and their different orientations without the need to turn the device.
12 cl, 11 dwg
