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Analysis of fracture induced scattering of microseismic shear-waves

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Abstract

Fractures are pervasive features within the Earth’s crust and have a significant influence on the multi-physical response of the subsurface. The presence of coherent fracture sets often leads to observable seismic scattering enabling seismic techniques to remotely locate and characterise fracture systems. In this study, we confirm the general scale-dependence of seismic scattering and provide new results specific to shear-wave propagation. We do this by generating full waveform synthetics using finite-difference wave simulation within an isotropic background model containing explicit fractures. By considering a suite of fracture models having variable fracture density and fracture size, we examine the widening effect of wavelets due to scattering within a fractured medium by using several different approaches, such as root-mean-square envelope analysis, shear-wave polarisation distortion, differential attenuation analysis and peak frequency shifting. The analysis allows us to assess the scattering behavior of parametrised models in which the propagation direction is either normal or parallel to the fracture surfaces. The quantitative measures show strong observable deviations for fractures size on the order of or greater than the dominant seismic wavelength within the Mie and geometric scattering regime for both propagation normal and parallel to fracture strike. The results suggest that strong scattering is symptomatic of fractures having size on the same order of the probing seismic wave.

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Authors and Affiliations

  1. School of Earth & Environment, University of Leeds, Leeds, LS2 9JT, UK

    Baban M. Yousef

  2. ESG Solutions, Kingston, Ontario, K7K 7K2, Canada

    Doug A. Angus

Authors
  1. Baban M. Yousef
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  2. Doug A. Angus
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Correspondence to Doug A. Angus.

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Yousef, B.M., Angus, D.A. Analysis of fracture induced scattering of microseismic shear-waves. Stud Geophys Geod 61, 728–753 (2017). https://doi.org/10.1007/s11200-016-0384-9

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  • DOI: https://doi.org/10.1007/s11200-016-0384-9

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