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MULTIFREQUENCY INVERSION OF INDUCTION LOGS1

 

作者: CH. KUTH,   F. M. NEUBAUER,  

 

期刊: Geophysical Prospecting  (WILEY Available online 1988)
卷期: Volume 36, issue 1  

页码: 66-82

 

ISSN:0016-8025

 

年代: 1988

 

DOI:10.1111/j.1365-2478.1988.tb02150.x

 

出版商: Blackwell Publishing Ltd

 

数据来源: WILEY

 

摘要:

ABSTRACTThe 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 con

 

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