Electromagnetic logging apparatus using vertical magnetic dipole

Details Electromagnetic logging apparatus using vertical magnetic dipole Electromagnetic logging apparatus using vertical magnetic dipole

1986-06-20

1987-11-03

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

343767, G01L 330, G01L 318, G01L 320, H01Q 1310

Patent

active

047045817

ABSTRACT:
An electromagnetic logging apparatus is disclosed which utilizes vertical magnetic dipole antennas for propagation logging, preferably at a frequency greater than 100 MHz. Slot antennas having conductive probes which are perpendicular to the borehole axis, and also perpendicular to a borehole radius, are employed to obtain the desired vertical magnetic dipole antenna characteristics. The depth of investigation is improved as compared to devices of this type which employ horizontal magnetic dipole antennas. Also, the antennas are tuned in a manner which provides advantageous operation.

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Bethe "Theory Of Diffraction by Small Holes" The Physical Review, 1944.
Freedman et al. "Theory Of Microwave Dielectric Constant Logging Using The Electromagnetic Wave Propagation Method" Geophysics, 1979.
Stratton "Electromagnetic Theory" McGraw Hill, 1941, p. 437.

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