1887

Abstract

Summary

We proposed a rock physics model for Gas Shale reservoirs which consider the microgeometry of the rock constituents and omit a preferred host. This model consists of solids components such as calcite, quartz, illite and kerogen (insoluble organic matter), and pores which contain water and/or gas. Pore systems are classified into intergranular pores, microcavities, and pores of organic matter. The organic matter constituent contains kerogen and pores, and its shape can vary. We apply the Effective Medium Approximation (EMA) method to compute the bulk (K) and shear (μ) effective moduli from proposed model. This method allows consider multiple phases that can be interconnected, granular materials might be well represented, and a preferred background is not required. Consequently, E (Young) modulus, ν (Poisson’ ratio), λ (Lamé constant), Vp (compressional velocity), Vs (shear velocity), and Vp/Vs ratio as well as the indicators E/ν and E/λ were obtain from effective K and μ. We apply the Newton-Raphson method to solve the EMA equations. We applied a modelling using a synthetic case study proposed to analyse how the elastic properties depend on the concentration but also of the shape of the constituent and its effect over Vp/Vs, E/ν and E/λ ratios.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.202187012
2021-12-01
2024-04-28
Loading full text...

Full text loading...

References

  1. Almarzooq, A., AlGhamdi, T., Koronfol, S., Dernaika, M., and Walls, J.
    [2014]. Shale gas characterization and property determination by digital rock physics. In SPE Saudi Arabia Section Technical Symposium and Exhibition. OnePetro.
    [Google Scholar]
  2. Berryman, J. G.
    [1980]. Long-wavelength propagation in composite elastic media II. Ellipsoidal inclusions. The Journal of the Acoustical Society of America, 68(6), 1820–1831.
    [Google Scholar]
  3. Chen, J., Zhang, G., Chen, H., and Yin, X.
    [2014]. The construction of shale rock physics effective model and prediction of rock brittleness. In SEG Technical Program Expanded Abstracts 2014 (pp. 2861–2865). Society of Exploration Geophysicists.
    [Google Scholar]
  4. Eshelby, J. D.
    [1957]. The determination of the elastic field of an ellipsoidal inclusion, and related problems. Proceedings of the royal society of London. Series A. Mathematical and physical sciences, 241(1226), 376–396.
    [Google Scholar]
  5. Guo, Z., Chapman, M., and Li, X.
    [2012]. A shale rock physics model and its application in the prediction of brittleness index, mineralogy, and porosity of the Barnett Shale. In SEG technical program expanded abstracts 2012 (pp. 1–5). Society of Exploration Geophysicists.
    [Google Scholar]
  6. Mavko, G., Mukerji, T., and Dvorkin, J.
    [2020]. The rock physics handbook. Cambridge university press.
    [Google Scholar]
  7. Norris, A. N.
    [1985]. A differential scheme for the effective moduli of composites. Mechanics of materials, 4(1), 1–16.
    [Google Scholar]
  8. Pan, X. P., Zhang, G. Z., and Chen, J. J.
    [2020]. The construction of shale rock physics model and brittleness prediction for high-porosity shale gas-bearing reservoir. Petroleum Science, 1–13.
    [Google Scholar]
  9. Passey, Q. R., Bohacs, K. M., Esch, W. L., Klimentidis, R., and Sinha, S.
    [2010]. From oil-prone source rock to gas-producing shale reservoir-geologic and petrophysical characterization of unconventional shale-gas reservoirs. In International oil and gas conference and exhibition in China. OnePetro.
    [Google Scholar]
  10. Schön, J. H.
    [2015]. Physical properties of rocks: Fundamentals and principles ofpetrophysics. Elsevier.
    [Google Scholar]
  11. Sondergeld, C. H., Newsham, K. E., Comisky, J. T., Rice, M. C., and Rai, C. S.
    [2010]. Petrophysical considerations in evaluating and producing shale gas resources. In SPE unconventional gas conference. OnePetro.
    [Google Scholar]
  12. Vernik, L., and Milovac, J.
    [2011]. Rock physics of organic shales. The leading edge, 30(3), 318–323.
    [Google Scholar]
  13. Wu, T.
    [1966]. The effect of inclusion shape on the elastic moduli of a two-phase material. International Journal of solids and structures, 2(1), 1–8.
    [Google Scholar]
  14. Zhang, C., Shan, W., and Wang, X.
    [2019]. Quantitative evaluation of organic porosity and inorganic porosity in shale gas reservoirs using logging data. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 41(7), 811–828.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.202187012
Loading
/content/papers/10.3997/2214-4609.202187012
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error