Classification of subsurface fracture roughness by polarimetric borehole radar

Motoyuki Sato, Moriyasu Takeshita

Research output: Contribution to conferencePaperpeer-review

Abstract

Polarimetric borehole radar systems, which can measure full polarimetry in drilled boreholes, were developed and applied to subsurface fracture detection and evaluation. Radar polarimetry can be used to obtain precise information from the radar targets beyond the limitation of wavelength. This is especially important in borehole radar, where radar resolution is poor due to the high attenuation of subsurface material. We use 100 MHz in order to obtain a deeper penetration depth, where the aperture of the subsurface fractures is typically less than 1 mm. Although direct observation or inverse approach cannot be used for subsurface fracture measurement, classification of subsurface fractures based on the radar polarimetry is possible. Field data was acquired in Mirror Lake test site, where water permeable fractures are known. Full polarimetric radar profiles show the difference of reflectivity depending on the polarization status. We found that the polarization information is related to fracture roughness and provides information on water permeability.

Original languageEnglish
Pages996-999
Number of pages4
Publication statusPublished - 2000 Dec 1
Event2000 Intenational Geoscience and Remote Sensing Symposium (IGARSS 2000) - Honolulu, HI, USA
Duration: 2000 Jul 242000 Jul 28

Other

Other2000 Intenational Geoscience and Remote Sensing Symposium (IGARSS 2000)
CityHonolulu, HI, USA
Period00/7/2400/7/28

ASJC Scopus subject areas

  • Computer Science Applications
  • Earth and Planetary Sciences(all)

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