Analysis of a guided wave along a conducting structure in a borehole

S. Ebihara, M. Sato, H. Niitsuma

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

A guided wave along a borehole is often observed in borehole radar measurements. These guided waves deform the antenna pattern and can cause artefacts in radar measurments. A water-filled borehole or a conducting logging cable can function as a waveguide for electromagnetic waves under some conditions. We describe the theoretical characteristics of such a guided wave in a borehole and compare them with our experiments. the measured signal discussed was obtained with a directional borehole radar. This radar uses a cyclindrical conformal array antenna as receiver and is a model of a conducting structure in a borehole. The induced field around the borehole was compared with the theory. the most fundamental symmetrical and asymmetrical modes were TM01 and HE11, and they were identified in the measured signals using time-frequency distribution analysis and by observation f the azimuthal field distribution of the magnetic field.

Original languageEnglish
Pages (from-to)489-505
Number of pages17
JournalGeophysical Prospecting
Volume46
Issue number5
DOIs
Publication statusPublished - 1998 Sep 1

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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