1887

Abstract

Summary

Characterizing fracture is important in order to understand how groundwater is transported and stored in fractured environments, to assess contaminant transport through fractures, as well to evaluate the mechanical behaviour of a fractured rock mass. In this research, we have investigated through careful laboratory experiments the amplitude versus offset (AVO) response of seismic reflections from a fracture. We use the linear slip boundary condition at the fracture and estimate the angle-dependent reflection response due to a single fracture. The observed angle-dependent reflectivity is inverted to obtain the fracture compliance and aperture. Two detailed laboratory experiments are performed - one using laterally homogeneous fracture and another using laterally heterogeneous fracture (partly air-filled and partly water-filled). Our results demonstrate that normal compliance (inverse stiffness) of a fracture can be quite accurately estimated from the AVO inversion of P-P reflected waves. It is also possible to obtain the non-zero tangential compliance. The existence of fluid in the fracture can be predicted. Distinction of the fracture infills and quantification of the fracture aperture are possible. This finding will be crucial for numerous new applications in civil and geotechnical engineering, hydrogeophysics, as well as in other areas of earth sciences and non-destructive material testing.

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/content/papers/10.3997/2214-4609.201702070
2017-09-03
2019-12-07
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References

  1. Aki, K. and Richards, R. B.
    [2002] Quantitative Seismology, 2nd edition, University Science Books.
    [Google Scholar]
  2. Baik, J. and Thompson, R. B.
    [1984] Ultrasonic scattering from imperfect interfaces: a quasi-static model, Journal of Nondestructive Evaluation, 4, 177–196.
    [Google Scholar]
  3. Chaisri, S. and Krebes, E. S.
    [2000] Exact and approximate formulas for P-SV reflection and transmission coefficients for a nonwelded contact interface: J. Geophysical Research: Solid Earth, 105, 28045–28054.
    [Google Scholar]
  4. Liu, E., Hudson, J., and Pointer, T.
    [2000] Equivalent medium representation of fractured rock, Journal of Geophysical Research, 105, 2981–3000.
    [Google Scholar]
  5. Minato, S. and Ghose, R.
    [2013] Inverse scattering solution for the spatially heterogeneous compliance of a single fracture, Geophysical Journal International, 195, 1878–1891.
    [Google Scholar]
  6. [2014] Imaging and characterization of a subhorizontal non-welded interface from point source elastic response, Geophysical Journal International, 197, 1090–1095.
    [Google Scholar]
  7. [2016] Enhanced characterization of fracture compliance heterogeneity using multiple reflections and data-driven Green’s function retrieval, Journal of Geophysical Research: Solid Earth, 121, 2813–2836.
    [Google Scholar]
  8. Nagy, P.
    [1992] Ultrasonic classification of imperfect interfaces, J. Nondestructive Evaluation, 11, 127–139.
    [Google Scholar]
  9. Schoenberg, M.
    [1980] Elastic wave behaviour across linear slip interfaces, JASA, 68, 1516–1521.
    [Google Scholar]
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