Focusing and spatial resolution of electromagnetic three-coil sounders

Distribution density functions for the sensitivity of a three-coil sounder are constructed as the weighted mean rock volume between the in-phase surfaces of running electromagnetic waves, which propagate from the emitting coil to the close measuring coils. The wave propagation velocity vector can be...

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Bibliographic Details
Published in:Doklady earth sciences 2009-07, Vol.427 (1), p.862-867
Main Authors: Epov, M. I., Pen’kovskii, V. I., Korsakova, N. K.
Format: Article
Language:English
Subjects:
Convolution
Earth and Environmental Science
Earth Sciences
Electromagnetic radiation
Electromagnetism
Geophysics
Rocks
Studies
Wave propagation
Wave velocity
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Summary:Distribution density functions for the sensitivity of a three-coil sounder are constructed as the weighted mean rock volume between the in-phase surfaces of running electromagnetic waves, which propagate from the emitting coil to the close measuring coils. The wave propagation velocity vector can be decomposed into two components; therefore, the focusing (the point of maximum sensitivity) and the resolution (the domain of sensitivity) of the three-coil sounder in the radial and vertical directions are different. The comparison of the apparent resistance obtained using the method of probabilistic convolution and the method of convolution with the radial volume distribution density between the in-phase surfaces of the emitting dipole is performed for the example of penetration into the oil stratum.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X0905033X