3D polarimetric GPR coherency attributes and full-waveform inversion of transmission data for characterizing fractured rock
- 1 May 2009
- journal article
- Published by Society of Exploration Geophysicists in Geophysics
- Vol. 74 (3), J23-J34
- https://doi.org/10.1190/1.3103253
Abstract
Ground-penetrating radar (GPR) can detect and describe fractures to help us characterize fractured rock formations. A fracture alters the incident waveform, or wave shape, of a GPR signal through constructive and destructive interference, depending on the aperture, fill, and orientation of the fracture. Because the electromagnetic (EM) waves of GPR are vectorial, features exhibiting strong directionality can change the state of polarization of the incident field. GPR methods that focus on changes in waveform or polarization can improve detection and discrimination of fractures within rock bodies. An algorithm based on coherency, a seismic attribute that delineates discontinuities in wavelet shape, is developed for polarimetric GPR. It uses the largest eigenvalue of the time-domain scattering matrix when calculating coherence. This algorithm is sensitive to wave shape and is unbiased by the polarization of GPR antennas. Polarimetric coherency works better than scalar coherency in removing the effects of polarization on field data collected from a fractured limestone plot used for hydrologic experimentation. Another method, for time-domain full-waveform inversion of transmission data, quantitatively determines fracture aperture and EM properties of fill, based on a thin-layer model. Inversion results from field data show consistency with the location of fractures from reflection data. These two methods offer better fracture-detection capability and quantitative information on fracture aperture, dielectric permittivity, and electrical conductivity of the fill than traditional GPR imaging and scalar-coherency attributes.Keywords
This publication has 38 references indexed in Scilit:
- Investigating multi‐polarization GPR wave transmission through thin layers: Implications for vertical fracture characterizationGeophysical Research Letters, 2006
- Four dimensional mapping of tracer channelization in subhorizontal bedrock fractures using surface ground penetrating radarGeophysical Research Letters, 2005
- Removal of wavelet dispersion from ground‐penetrating radar dataGeophysics, 2003
- Time-domain inverse scattering method for cross-borehole radar imagingIEEE Transactions on Geoscience and Remote Sensing, 2002
- Finding the strike direction of fractures using GPRGeophysical Prospecting, 2001
- In situ 2-D and 3-D measurements of radiation patterns of half-wave dipole GPR antennasJournal of Applied Geophysics, 2000
- Analysis of GPR Polarization PhenomenaJournal of Environmental and Engineering Geophysics, 1996
- The application of ground penetrating radar for mapping fractures in plutonic rocks within the Whiteshell Research Area, Pinawa, Manitoba, CanadaJournal of Applied Geophysics, 1995
- Electromagnetic scattering by buried objects of low contrastIEEE Transactions on Geoscience and Remote Sensing, 1988
- Wave equation migration with the phase‐shift methodGeophysics, 1978