1887

Abstract

Summary

Understanding of the effects of total organic carbon (TOC) content and saturation on elastic properties of gas shales would allow quantitative and reliable estimation of reservoir resources. Here we use anisotropic differential effective medium (DEM) modelling to capture the effects of TOC and simultaneously invert for inorganic matrix properties of the Bakken and Bazhenov shales. Then we show that the effect of partial saturation observed in controlled laboratory experiments, cannot be explained with saturation effects alone. We speculate that desiccation is accompanied by development of discontinuities as have been reported in a number of studies. Incorporation of the effect of horizontal discontinuities modelled using Sayers-Kachanov excess compliance approach results in improved data fitting.

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/content/papers/10.3997/2214-4609.201413229
2015-06-01
2024-04-26
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References

  1. Bornert, M., F.Vales, H.Gharbi, and D.Nguyen Minh
    [2010], Multiscale Full-Field Strain Measurements for Micromechanical Investigations of the Hydromechanical Behaviour of Clayey Rocks, Strain, 46(1), 33–46.
    [Google Scholar]
  2. Carcione, J. M., H. B.Helle, and P.Avseth
    [2011], Source-rock seismic-velocity models: Gassmann versus Backus, Geophysics, 76(5), N37–N45.
    [Google Scholar]
  3. Dewhurst, D.N., B.Maney, B.Clennell, C.Delle Piane, C.Madonna, E.Saenger, and N.Tisato
    , [2012], Impact of saturation change on shale properties. Extended abstract for 3rd EAGE Shale Conference, Barcelona, 4pp.
    [Google Scholar]
  4. Løseth, H., L.Wensaas, M.Gading, K.Duffaut, and M.Springer
    [2011], Can hydrocarbon source rocks be identified on seismic data?, Geology, 39(12), 1167–1170.
    [Google Scholar]
  5. Lucier, A. M. H., R.Hofmann, and L. T.Bryndzia
    [2011]. Evaluation of variable gas saturation on acoustic log data from the Haynesville Shale gas play, NW Louisiana, USA. The Leading EdgeMarch: 300–311.
    [Google Scholar]
  6. Nishizawa, O.
    [1982]. Seismic vlocity anisotropy in a medium containing oriented cracks – transversely isotropic case. Journal of Physics of the Earth30: 331–347.
    [Google Scholar]
  7. Sayers, C. M.
    [2013]. The effect of kerogen on the elastic anisotropy of organic-rich shales. Geophysics78(2): D65–D74.
    [Google Scholar]
  8. Sayers, C. and M.Kachanov
    [1995]. Microcrack-indused elastic wave anisotropy of brittle rock, Journal of Geophysical Research100: 4149–4156.
    [Google Scholar]
  9. Vales, F., D. N.Minh, H.Gharbi, and A.Rejeb
    (2004), Experimental study of the influence of the degree of saturation on physical and mechanical properties in Tournemire shale (France), Appl Clay Sci, 26(1–4), 197–207.
    [Google Scholar]
  10. Vernik, L. and C.Landis
    [1996]. Elastic anisotropy of source rocks: Implications for hydrocarbon generation and primary migration. AAPG Bulletin-American Association of Petroleum Geologists80(4): 531–544.
    [Google Scholar]
  11. Vernik, L. and X. Z.Liu
    [1997]. Velocity anisotropy in shales: A petrophysical study. Geophysics62(2): 521–532.
    [Google Scholar]
  12. Vernik, L. and A.Nur
    [1992]. Ultrasonic Velocity and Anisotropy of Hydrocarbon Source Rocks. Geophysics57(5): 727–735.
    [Google Scholar]
  13. Yan, F. H., D.-H.
    (2013), Measurement of elastic properties of kerogen in SEG, edited, pp. pp. 2778–2782, SEG, Houston, Texas, US.
    [Google Scholar]
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