1887

Abstract

Summary

Complicated pore network of carbonate rocks and existence of different porosity types in them, generate many problems in petrophysical evaluation of carbonate reservoirs. Heterogeneous pore system of carbonate rocks causes unreliable estimation of Archie's parameters such as cementation factor (m) in calculation of water saturation. Traditional method for determination of m is log-log plot of formation resistivity factor (F) versus porosity. This technique gives undesirable results in carbonate rocks, because F data versus porosity significantly deviate from a straight line.

In this study, electrical tortuosity is introduced as a new classification parameter for categorizing F data to enhance the prediction accuracy of m value. In other words, rocks with similar values of electrical tortuosity constitute a distinct class which has its own linear equation of F versus porosity in log-log plot. Indeed, tortuosity is applied to divide F data into different electrical rock types. To verify this approach, an electrical dataset from one of the Middle East carbonate oilfield was used. Results showed that electrical tortuosity technique is a suitable approach for reduction of F data scattering and therefore improvement of estimation accuracy of m.

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/content/papers/10.3997/2214-4609.201900716
2019-06-03
2024-03-28
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References

  1. Archie, G. E.
    [1942] The electrical resistivity log as an aid in determining some reservoir characteristics. Transactions of the AIME, 146(01), 54–62.
    [Google Scholar]
  2. Fleury, M.
    [2002] Resistivity in carbonates: new insights. SPE Annual Technical Conference and Exhibition, San Antonio, Texas, 29September- 2October, Paper No. SPE 77719.
    [Google Scholar]
  3. Focke, J. and D.Munn
    [1987] Cementation exponents in Middle Eastern carbonate reservoirs. SPE Formation Evaluation, 2(02), 155–167.
    [Google Scholar]
  4. Hasanigiv, M. and M.Rahimi
    [2008] New Correlations for Porosity Exponent in Carbonate Reservoirs of Iranian Oil Fields in Zagros Basin. Journal of Science (University of Tehran), 34(2): 1–7.
    [Google Scholar]
  5. Markov, M., Mousatov, A., Kazatchenko, E. and Markova, I.
    [2014] Determination of electrical conductivity of double-porosity formations by using generalized differential effective medium approximation. Journal of Applied Geophysics, 108, 104–109.
    [Google Scholar]
  6. Müller-Huber, E., Schoen, J. and Börner, F.
    [2015] The effect of a variable pore radius on formation resistivity factor. Journal of Applied Geophysics, 116, 173–179.
    [Google Scholar]
  7. Nabawy, B. S.
    [2015] Impacts of the pore-and petro-fabrics on porosity exponent and lithology factor of Archie's equation for carbonate rocks. Journal of African Earth Sciences, 108, 101–114.
    [Google Scholar]
  8. Ramakrishnan, T. S., Ramamoorthy, R, Fordham, E., Schwartz, L., Herron, M., Saito, N. and Rabaute, A.
    [2001] A model-based interpretation methodology for evaluating carbonate reservoirs. SPE Annual Technical Conference and Exhibition, New Orlean, Louisiana, 30September-3October, Paper No. SPE 71704.
    [Google Scholar]
  9. Rezaee, M. R, Motiei, H. and Kazemzadeh, E.
    [2007] A new method to acquire m exponent and tortuosity factor for microscopically heterogeneous carbonates. Journal of Petroleum Science and Engineering, 56(4), 241–251.
    [Google Scholar]
  10. Soleymanzadeh, A., Jamialahmadi, M., Helalizadeh, A. and Soulgani, BS.
    [2018] A new technique for electrical rock typing and estimation of cementation factor in carbonate rocks. Journal of Petroleum Science and Engineering, 166, 381–388.
    [Google Scholar]
  11. Tan, F., Zhao, R, Zhao, Y., Pan, Z. and Li, H.
    [2017] A case study: evaluating low-porosity and ultra-low-permeability Triassic reservoir rocks in the Ordos Basin by the integration of logs and core. Petroleum Geoscience, 23(4), 454–465.
    [Google Scholar]
  12. Winsauer, W.O., Shearin, H.M.Jr, Masson, P.H. and Williams, M.
    [1952] Resistivity of brine-saturated sands in relation to pore geometry. AAPG Bulletin, 36(2), 253–277.
    [Google Scholar]
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