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Volume 36 Number 1
  • E-ISSN: 1365-2478

Abstract

ABSTRACT

The concept of multifrequency induction logging simulations in the frequency range of 10 kHz to 1 MHz, applied to two‐dimensional, axial symmetric model geometries, is presented. The scalar Helmholtz equation has been solved by a finite‐element procedure. The model domain has been discretisized under the condition that the discontinuities in conductivity are represented by the nodes of the adjacent triangular elements. The modification of the signal distribution by the skin effect is illustrated for several models. Several sets of induction logs have been calculated with particular consideration of the frequency‐dependent conductivities and permittivities.

The improvement of a multifrequency inversion technique, based on standard least‐squares methods, is shown for a two‐layer model including borehole and invasion zones. Using this improved inversion technique we can state, as an additional inversion parameter, the frequency dependence of each inverted rock conductivity.

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2006-04-27
2024-04-27

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References

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  • Article Type: Research Article

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