Application of polarimetri borehole radar to crack characterization

Motoyuki Sato, Takashi Miwa, Hiroaki Niitsuma

Research output: Contribution to conferencePaperpeer-review

3 Citations (Scopus)

Abstract

In this paper we discuss potential of polarimetrie borehole radar measurement for formation and reservoir evaluation. Borehole radar have not been used in low resistive formation due to its short penetration depth. However, polarimetrie radar measurement has good possibility to give us more information about formation and expands its practical usage. A prototype broad-band (10MHz-500MHz) polarimetrie borehole radar system was made using a network analyzer and an optical signal link. Single-hole and cross-hole measurement using the radar system was carried out in granite rock. The measured signals showed that detection of the short-range reflections can significantly be improved with cross-polarization measurements since direct coupling between the transmitting and receiving antennas is reduced. Applying an inverse filter method to compensate antenna characteristics, polarization dependency of reflectivity from subsurface cracks could be quantitatively evaluated as a scattering matrix. We discuss the polarization dependency of the scattering matrix of cracks for characterization.

Original languageEnglish
Publication statusPublished - 1995 Jan 1
EventSPWLA 36th Annual Logging Symposium 1995 - Paris, France
Duration: 1995 Jun 261995 Jun 29

Other

OtherSPWLA 36th Annual Logging Symposium 1995
CountryFrance
CityParis
Period95/6/2695/6/29

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Energy Engineering and Power Technology

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