1887

Abstract

Summary

Elastic anisotropy of vertically transversely isotropic (VTI) rocks has been increasingly investigated in the past two decades due to the key role of shales in exploration of oil and gas conventional and unconventional reservoirs. In this presentation we introduce a new anisotropy parameter: “hydrostatic strain ratio” (designated by Ω). It is defined as the ratio between bedding-normal and bedding-parallel contraction in hydrostatic compression, and analyzed based on Hooke’s law for VTI rocks. The Ω parameter is examined here using static and dynamic measurements of dry organic-rich chalk core samples from the Shefela basin, and dynamic data of eight other organic-rich rock formations published by . Using the anisotropy results of the examined organic-rich rocks, we propose relationships between Ω and Thomsen’s anisotropy parameters (ε and γ). The anisotropic behavior of the examined organic-rich rocks is found to be very consistent according to the strong connection between Ω and Thomsen’s parameters, and to the similar dependency on organic matter content. We argue that the Ω is advantageous because it can be extracted from static and dynamic measurements, and because it provides a link between elastic VTI rock properties.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201801027
2018-06-11
2020-04-05
Loading full text...

Full text loading...

References

  1. Bisnovat, K., Hatzor, Y. H., Vinegar, H. J., Nguyen, S. V., Palchik, V. and Feinstein, S.
    [2015] Mechanical and petrophysical behavior of organic-rich chalk from the Judea Plains, Israel. Marine and Petroleum Geology, 64, 152–164.
    [Google Scholar]
  2. Korsnes, R., Wersland, E., Austad, T. and Madland, M.
    [2008] Anisotropy in chalk studied by rock mechanics. Journal of Petroleum Science and Engineering, 62(1), 28–35.
    [Google Scholar]
  3. Shitrit, O., Hatzor, Y. H., Feinstein, S., Palchik, V. and Vinegar, H. J.
    [submitted] Static and dynamic elastic moduli of organic-rich chalk. manuscript submitted to Geophysical Prospecting.
    [Google Scholar]
  4. [2016] Effect of Kerogen on Rock Physics of Immature Organic-Rich Chalks. Marine and Petroleum Geology, 73, 392–404.
    [Google Scholar]
  5. Shitrit, O., Hatzor, Y. H., Feinstein, S. and Vinegar, H. J.
    [2017] Acoustic and Petrophysical Evolution of Organic-Rich Chalk Following Maturation Induced by Unconfined Pyrolysis. Rock Mechanics and Rock Engineering, 50(12), 3273–3291.
    [Google Scholar]
  6. Talesnick, M., Hatzor, Y. and Tsesarsky, M.
    [2001] The elastic deformability and strength of a high porosity, anisotropic chalk. International Journal of Rock Mechanics and Mining Sciences, 38(4), 543–555.
    [Google Scholar]
  7. Thomsen, L.
    [1986] Weak elastic anisotropy. Geophysics, 51(10), 1954–1966.
    [Google Scholar]
  8. Togashi, Y., Kikumoto, M. and Tani, K.
    [2017] An Experimental Method to Determine the Elastic Properties of Transversely Isotropic Rocks by a Single Triaxial Test. Rock Mechanics and Rock Engineering, 50(1), 1–15.
    [Google Scholar]
  9. Vernik, L. and Liu, X.
    [1997] Velocity anisotropy in shales: A petrophysical study. Geophysics, 62(2), 521–532.
    [Google Scholar]
  10. Yan, F., Han, D., Sil, S. and Chen, X.
    [2016] Analysis of seismic anisotropy parameters for sedimentary strata. Geophysics, 81(5), D495–D502.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201801027
Loading
/content/papers/10.3997/2214-4609.201801027
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