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Hansgeorg Pape; Dieter Vogelsang:

Fractal Evaluation of Induced Polarization Logs in the KTB-Oberpfalz HB

1996. 27 pages, 17x24cm, 120 g
Language: English

(Geologisches Jahrbuch Reihe E, Band E 54)

ISBN 978-3-510-96033-0, paperback, price: 9.00 €

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Contents

Contents top ↑


1 Introduction 5
2 Theory of Induced Polarization (JP) 5
2.1 Measured IP-parameters 6
2.1.1 Apparent resistivity 6
2.1.2 Prevoltage between potential electrodes 6
2.1.3 Chargeability 7
2.1.4 Shape of relaxation-curve 7
2.1.5 Dependence of IP-parameters on charging time 8
2.2 Mathematical description of IP-relaxation-curves
based on a fractal pore space model 8
2.2.1 Modelling of IP-relaxation 8
2.2.2 Calculation of theoretical relaxation-curves
and corresponding distributions of relaxation times 11
3 Evaluation of Induced-polarization Measurements
in the KTB-Oberpfalz HB 14
3.1 Evaluation of primary IP-parameters in the depth-interval 350-4500 m 14
3.1.1 Prevoltage between potential electrodes 14
3.1.2 Apparent resistivity 18
3.1.3 Chargeability 18
3.2 Evaluation of the "new" IP-parameters relaxation exponent
and extreme relaxation time 18
4 Investigation of the System of Faults and Mylonitic Zones 24
5 Conclusions 26
6 References 26