1887
Volume 17 Number 4
  • E-ISSN: 1365-2478

Abstract

ABSTRACT

This paper deals with electromagnetic fields in the so called “Transient Induced Polarization Technique”. Field equations are integrated in the case of a polarizable sphere inbedded in a sterile overburden. The existence of a remanent polarization vector P which slowly decays once the charging current has been cut off is taken as the initial condition. When the surface between the air and overburden is (as a first step) disregarded, the Laplace transform of the EM fields is given. The integral of the electric field (which is fairly often the result of prospection work) is independent of the various time constants related to electrochemical processes, but it stands as a good measurement of the total electrostatic dipole created by the charging current.

We investigate the geometrical circumstances that can bring negative values of I.P. signal. Such negative values can be found in two cases: 1. The discharge currents are. distorted by the ground surface. 2. The I.P. signal is picked up by electrodes inside the polarizable material.

The last part is dedicated to an account of experimental work performed on models and of an actual case history.

The mathematical derivations are included in an appendix.

Loading

Article metrics loading...

/content/journals/10.1111/j.1365-2478.1969.tb01991.x
2006-04-27
2024-03-29
Loading full text...

Full text loading...

References

  1. J.Loeb, 1970, Induced Polarization. Lumped circuit parameters, Analog models and equations of E.M. fields. To be published in “Geoexploration”.
    [Google Scholar]
  2. T. R.Madden and T.Cantwell, 1963, Induced Polarization. A review.MIT Report (January).
    [Google Scholar]
  3. E.Warburg1898, Über das Verhalten sogenannter unpolarisierbarer Elektroden gegen Wechselstrom. Physik und Chemie67.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/journals/10.1111/j.1365-2478.1969.tb01991.x
Loading
  • Article Type: Research Article

Most Cited This Month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error