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CHAPTER 4: LARGE-LAYOUT HARMONIC FIELD SYSTEMS

By
D. S. Parasnis
D. S. Parasnis
University of Luleå, Luleå, Sweden.
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Published:
January 01, 1991

INTRODUCTION

Harmonic field systems that use large, fixed layouts (rectangular or circular loops or long grounded cables as sources) are among the oldest electromagnetic prospecting methods. These methods were developed to a large extent in Sweden by Karl Sundberg and his group during the two decades following the end of World War I in 1918 and were used mainly for ore prospecting (Sundberg, 1931) but also for structural investigations in oil fields (Sundberg and Hedström, 1934). They were still being used at the end of the 1940s but were gradually replaced by the small-loop (or dipole source) systems because the small loop systems were more flexible and, at the same time, adequate for the shallow exploration problems being encountered. The superiority of reflexion seismics over electromagnetics for oil prospecting was already manifest and the large-layout systems were no longer used in oil exploration.

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Contents

Investigations in Geophysics

Electromagnetic Methods in Applied Geophysics: Volume 2, Application, Parts A and B

Society of Exploration Geophysicists
Volume
3
ISBN electronic:
9781560802686
Publication date:
January 01, 1991

GeoRef

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