Anisotropic rock physics models for interpreting pore structures in carbonate reservoirs
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We developed an anisotropic effective theoretical model for modeling the elastic behavior of anisotropic carbonate reservoirs by combining the anisotropic self-consistent approximation and differential effective medium models. By analyzing the measured data from carbonate samples in the TL area, a carbonate pore-structure model for estimating the elastic parameters of carbonate rocks is proposed, which is a prerequisite in the analysis of carbonate reservoirs. A workflow for determining elastic properties of carbonate reservoirs is established in terms of the anisotropic effective theoretical model and the pore-structure model. We performed numerical experiments and compared the theoretical prediction and measured data. The result of the comparison suggests that the proposed anisotropic effective theoretical model can account for the relation between velocity and porosity in carbonate reservoirs. The model forms the basis for developing new tools for predicting and evaluating the properties of carbonate reservoirs.
Keywordsanisotropy rock physics pore structure modulus carbonates
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- Agersborg, R. T., Hohansen, A., and Jakobsen, M., 2005, The T-matrix approach for carbonate rocks: 75th Ann. Internat. Mtg., Soc. Explor. Geophys., Expanded Abstracts, 1597–1600.Google Scholar
- Anselmetti, F., and Ebrili, G. P., 1999, The velocitydeviation log: A tool to predict pore type and permeability trends in carbonate drill holes from sonic and porosity or density log: AAPG Bulletin, 83(3), 450–466.Google Scholar
- Choquette, P. W., and Pray, L. C., 1970, Geologic nomenclature and classification of porosity in sedimentary carbonates: AAPG Bulletin, 54(2), 207–244.Google Scholar
- Christensen, R. M., 2005, Mechanics of composite materials: Wiley, New York, 31–71.Google Scholar
- Dunham, R. J., 1962, Classification of carbonate rocks according to depositional texture: AAPG Bulletin, 46(1), 108–121.Google Scholar
- Krief, M., Garat, J., Stellingwerff, J., and Ventre, J., 1990, A petrophysical interpretation using the velocities of P and S waves (full waveform sonic): The Log Analyst, 31(6), 355–369.Google Scholar
- Kumar M., and Han, De-hua, 2005, Pore shape effect on elastic properties of carbonate rocks: 75th Ann. Internat. Mtg., Soc. Explor. Geophys., Expanded Abstracts, RP1.3, 1477–1480.Google Scholar
- Lucia, F. J., 1995, Rock-fabric/petrophysical classification of carbonate pore space for reservoir characterization: AAPG Bulletin, 79(9), 1275–1300.Google Scholar
- Mavko, G., Mukerkji T., and Dvorkin, J., 2001, The rock physics handbook: Tools for seismic analysis inporous media: Cambridge University Press, New York, 169–224.Google Scholar
- Weger, R. J., Baechle, G. T., Masaferro, J. L., and Everli. G. P., 2004, Effect of porestructure on sonic velocity in carbonate: 74th Ann. Internat. Mtg., Soc. Explor. Geophys., Expanded Abstracts, 1774–1777.Google Scholar