Subsurface fracture characterisation using full polarimetric borehole radar data analysis with numerical simulation validation

Khamis Mansour; Motoyuki Sato

doi:10.1071/EG11040

ISSN: 0812-3985
E-ISSN: 1834-7533

Subsurface fracture characterisation using full polarimetric borehole radar data analysis with numerical simulation validation
Authors Khamis Mansour^a,b,d and Motoyuki Sato^c
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^a Graduate School of Environmental Studies, Tohoku University, 41 Kawauchi, Sendai, 980-8576, Japan. ^b National Research Institute of Astronomy and Geophysics, 11722 Helwan, Cairo, Egypt. ^c Center for Northeast Asian Studies, Tohoku University, 41 Kawauchi, Sendai, 980-8576, Japan. ^d Corresponding author. Email: [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 43, Issue 2, Jun 2012, p. 125 - 135
DOI: https://doi.org/10.1071/EG11040
- Received: 08 Aug 2011
- Accepted: 06 Mar 2012
- Published online: 01 Jun 2012

Abstract

[

We report on the utilisation of a full polarimetric subsurface borehole radar measuring system for efficient characterisation of subsurface fractures. This system can measure the full polarisation (HH, HV, VV and VH) of electromagnetic waves for one borehole, and thus enables us to obtain more information about subsurface fractures compared to that obtained from conventional borehole radar systems, which usually use only single polarisation. Polarimetric datasets have been acquired at several sites, particularly at Mirror Lake, USA, which is a well known site for testing subsurface fractures. Nine fracture sets were observed in one borehole, FSE-1, in the Mirror Lake site. These were divided into four category fracture sets depending on polarimetric analysis of alpha, entropy and anisotropy decomposition analysis of scattering behaviour from fractures at frequency 30 MHz. We found that the characterised four fractures sets have the highest hydraulic permeable zones at depths of 24.75 m, and 47.80 m. The lowest hydraulic permeable zones were found to be at 28.50 m, 36.15 m and 44.80 m. These results show a good consistency with the hydraulic fractures permeability tracer test that was done by USGS. To validate these conclusions we implemented numerical simulation for a synthesised fractures property using the Finite Difference Time Domain (FDTD) method. Here, we used a plane wave as an electromagnetic source with frequency ranging from 1 MHz to 200 MHz, and monitored the electromagnetic scattering for various fractures. We found that distributions of alpha, entropy and anisotropy polarimetric parameters differ with the fracture roughness property which validates the polarimetric analysis of the measured data.

The polarimetric borehole radar has the ability to characterise subsurface fractures. Nine fracture sets were characterised into four category fractures depending on polarimetric analysis of alpha, entropy and anisotropy decomposition. Validation of these results was implemented by numerical simulation for a synthesised fractures property using the Finite Difference Time Domain method.

]

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References

Brown S. 1995 Simple mathematical model of a rough fracture: Journal of Geophysical Research 100 5941 5952 10.1029/94JB03262
https://doi.org/10.1029/94JB03262 [Google Scholar]
Brown S. Scholz C. H. 1985 Broad bandwidth study of the topography of natural rock surfaces: Journal of Geophysical Research 90 575 582 10.1029/JB090iB14p12575
https://doi.org/10.1029/JB090iB14p12575 [Google Scholar]
Cloude S. R. Pottier E. 1997 An entropy based classification scheme for land applications of polarimetric SAR: IEEE Transactions on Geoscience and Remote Sensing 35 68 78 10.1109/36.551935
https://doi.org/10.1109/36.551935 [Google Scholar]
Lee, J.-S., and Pottier, E., 2009, Polarimetric radar imaging: from basics to applications: CRC Press, Taylor and Francis.
Kranzz R. L. Frankel A. D. Engelder T. Scholz C. H. 1979 The permeability of whole and jointed Barre granite: International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts 16 225 234 10.1016/0148‑9062(79)91197‑5
https://doi.org/10.1016/0148-9062(79)91197-5 [Google Scholar]
Lane, J. W., Jr, and Haeni, F. P., 1998, Use of a multi-offset borehole-radar reflection method in fractured crystalline bedrock at Mirror Lake, Grafton County, New Hampshire: Proc. Symp. Appl. Geophys. Eng. and Environ. Problems, 359–368.
Sato, M., Takeshita, M., Miwa, T., and Lane, J. W., Jr., 1999, Polarimetric borehole radar measurement at the Mirror Lake test site: Proc. SPIE, vol. 3752, 104–112.
Mandelbrot, B. B., 1982, The fractal geometry of nature: W. H. Freeman.
Mansour, K., and Sato, M., 2010, FDTD simulation of electromagnetic wave scattering from a rough surface synthesized by fractal theory: Proceedings of the Formation Evaluation Symposium of Japan, E1–E7.
Paillet F. L. Hess A. E. Cheng C. H. Hardin E. 1987 Characterization of fracture permeability with high-resolution vertical flow measurements during borehole pumping: Ground Water 25 28 40 10.1111/j.1745‑6584.1987.tb02113.x
https://doi.org/10.1111/j.1745-6584.1987.tb02113.x [Google Scholar]
Peitgen, H.-O., and Saupe, D., 1988, The science of fractal images: Springer-Verlag.
Power W. L. Tullis T. E. Brown S. R. Boitnott G. N. Scholz C. H. 1987 Roughness of natural fault surfaces: Geophysical Research Letters 14 29 32 10.1029/GL014i001p00029
https://doi.org/10.1029/GL014i001p00029 [Google Scholar]
Sato M. Takeshita T. 2000 Estimation of subsurface fracture roughness by polarimetric borehole radar: IEICE Transactions on Electronics 83 1881 1888
[Google Scholar]
Yee K. S. 1966 Numerical solution of initial boundary value problems involving Maxwell’s equations in isotropic media: IEEE Transactions on Antennas and Propagation 14 302 307 10.1109/TAP.1966.1138693
https://doi.org/10.1109/TAP.1966.1138693 [Google Scholar]
Zhao J.-G. Sato M. 2006 Radar polarimetry analysis applied to single-hole fully polarimetric borehole radar: IEEE Transactions on Geoscience and Remote Sensing 44 3547 3554 10.1109/TGRS.2006.882260
https://doi.org/10.1109/TGRS.2006.882260 [Google Scholar]

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Subsurface fracture characterisation using full polarimetric borehole radar data analysis with numerical simulation validation

Exploration Geophysics 43, 125 (2012); https://doi.org/10.1071/EG11040

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Article Type: Research Article

Keyword(s): FDTD; fractal fracture; fracture characterisation; polarimetric analysis; polarimetric borehole radar

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Subsurface fracture characterisation using full polarimetric borehole radar data analysis with numerical simulation validation

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