Wait Overvoltage Research and Geophysical Applications

International Series of Monographs on Earth Sciences
1. Auflage 2013
ISBN: 978-1-4831-5131-1
Verlag: Elsevier Science & Techn.
Format: PDF
Kopierschutz: 1 - PDF Watermark

E-Book, Englisch, 166 Seiten, Web PDF

Overvoltage Research and Geophysical Applications deals with the subject of overvoltage (or induced electrical polarization) as it relates to geophysical exploration. This book presents the results of theoretical and experimental research conducted between 1946 and 1958 to investigate overvoltage and sponsored by Newmont Mining Corporation. This book is comprised of 10 chapters and begins with a brief overview of the history of Newmont's interest in overvoltage. The next chapter describes a theory for induced polarization effects (for step-function excitation), with particular reference to a mathematical formulation that represents the volume distribution of dipolar sources. The reader is then introduced to a brief theoretical derivation for the effective conductivity and dielectric constant of a homogeneous medium loaded with a uniform distribution of spherical conducting particles. The following chapters explore the complex conductivity of rocks as a function of frequency; laboratory studies of induced polarization in mineralized and non-mineralized rock specimens; induced polarization decay curves on rock specimens; and phenomena resulting from electric polarization of rocks at low frequencies. Some electrical transient measurements on igneous, sedimentary, and metamorphic rocks are presented. The final chapter considers various explanations of the normal effect and describes induced-polarization experiments. This monograph will be of interest to geophysicists.

Autoren/Hrsg.

Wait, James R.

Inhaltsverzeichnis

1;Front Cover;1
2;Overvoltage Research and Geophysical Applications;4
3;Copyright Page ;5
4;Table of Contents;6
5;PREFACE;8
6;CHAPTER 1. HISTORICAL SUMMARY OF OVERVOLTAGE DEVELOPMENTS BY NEWMONT EXPLORATION LIMITED, 1946-1955;10
6.1;REFERENCES;12
7;CHAPTER 2. A THEORY OF INDUCED POLARIZATION EFFECTS (FOR STEP-FUNCTION EXCITATION);13
7.1;INTRODUCTION;13
7.2;MATHEMATICAL FORMULATION OF THE DYNAMIC DIPOLAR REPRESENTATION;14
7.3;SPECIFIC CASES;17
7.4;REFERENCES;30
8;CHAPTER 3. A PHENOMENOLOGICAL THEORY OF OVERVOLTAGE FOR METALLIC PARTICLES;31
8.1;INTRODUCTION;31
8.2;BASIC CONSIDERATIONS;31
8.3;TRANSIENT RESPONSE;34
8.4;REFERENCES;37
9;CHAPTER 4. THE VARIABLE-FREQUENCY METHOD;38
9.1;I. FUNDAMENTAL CONSIDERATIONS;38
9.2;II. LINE COUPLING EFFECTS;48
9.3;III. GENERAL DESCRIPTION OF RESULTS;54
9.4;REFERENCES;58
10;CHAPTER 5. LABORATORY INVESTIGATION OF OVERVOLTAGE;59
10.1;INTRODUCTION;59
10.2;EXPERIMENTAL PROCEDURE;59
10.3;SOME THEORETICAL CONSIDERATIONS;64
10.4;SOME LABORATORY RESULTS;66
10.5;INVESTIGATIONS ON STANDARD SAMPLES;67
11;CHAPTER 6A. CRITERIA FROM THE TRANSIENT DECAY CURVES;80
11.1;SUMMARY OF RESULTS OF THE DERIVATIVE CRITERIA;82
11.2;CONCLUDING REMARKS;83
12;CHAPTER 6B. ANALYSIS OF THE FREQUENCY RESPONSE DATA;93
13;CHAPTER 7. ANALYSIS OF SOME ELECTRICAL TRANSIENT MEASUREMENTS ON IGNEOUS, SEDIMENTARY AND METAMORPHIC ROCKS;101
13.1;INTRODUCTION;101
13.2;FORM OF THE NEWMONT DATA;101
13.3;REVIEW OF POLARIZATION THEORY;102
13.4;EVALUATION OF NEWMONT DATA;109
13.5;SUMMARY AND CONCLUSIONS;114
13.6;REFERENCES;120
14;CHAPTER 8. FIELD EQUIPMENT FOR PROSPECTING BY THE OVERVOLTAGE METHOD;121
15;CHAPTER 9. OVERVOLTAGE FIELD RESULTS;124
15.1;OVERVOLTAGE FIELD RESULTS;124
16;CHAPTER 10A. THE NORMAL EFFECT—PART I;134
16.1;I. INTRODUCTION;134
16.2;II. EXPERIMENTAL;138
16.3;III. RESULTS AND DISCUSSION;147
16.4;IV. CONCLUSIONS;150
16.5;REFERENCES;150
17;CHAPTER 10B. THE NORMAL EFFECT—PART II;151
17.1;I. INTRODUCTION;151
17.2;II. EXPERIMENTAL;154
17.3;III. RESULTS AND DISCUSSION;162
17.4;IV. CONCLUSIONS;167
17.5;REFERENCES;167