Abstract
The Ordovician carbonate rocks of the Yingshan formation in the Tarim Basin have a complex pore structure owing to diagenetic and secondary structures. Seismic elastic parameters (e.g., wave velocity) depend on porosity and pore structure. We estimated the average specific surface, average pore-throat radius, pore roundness, and average aspect ratio of carbonate rocks from the Tazhong area. High P-wave velocity samples have small average specific surface, small average pore-throat radius, and large average aspect ratio. Differences in the pore structure of dense carbonate samples lead to fluid-related velocity variability. However, the relation between velocity dispersion and average specific surface, or the average aspect ratio, is not linear. For large or small average specific surface, the pore structure of the rock samples becomes uniform, which weakens squirt flow and minimizes the residuals of ultrasonic data and predictions with the Gassmann equation. When rigid dissolved (casting mold) pores coexist with less rigid microcracks, there are significant P-wave velocity differences between measurements and predictions.
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References
Agersborg, R., Johansen, T. A., Jakobsen, M., Sothcott, J., and Best, A., 2008, Effects of fluids and dualpore systems on pressure-dependent velocities and attenuations in carbonates: Geophysics, 73(5), N35–N47.
Anselmetti, F. S. and Eberli, G. P., 1993, Controls on sonic velocity in carbonates: Pure and Applied Geophysics, 141, 287–323.
Anselmetti, F. S., and Eberli, 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 logs: AAPG Bulletin, 83, 450–466.
Ba, J., Carcinoe, J. M., and Nie, J. X., 2011, Biot-Rayleigh theory of wave propagation in double-porosity media: Journal of Geophysical Research-solid earth, 116, B06202.
Ba, J., Cao, H., Carcione, J. M., Tang, G., Yan, X. F., Sun, W. T., and Nie, J. X., 2013, Multiscale rock-physics templates for gas detection in carbonate reservoirs: Journal of Applied Geophysics, 93, 77–82.
Baechle, G. T., Al-Kharusi, L., and Eberli, G. P., 2007, Effect of spherical pore shapes on acoustic properties: AAPG Annual Convention, Abstracts Volume, 16, 7.
Baechle, G. T., Colpaert, A., Eberli, G. P., and Weger, R., 2008, Effects of microporosity on sonic velocity in carbonate rocks: The Leading Edge, 27(8), 1012–1018.
Deng, J. X., Qu, S. L., and Wang, S. X., 2012, P-wave attenuation and dispersion in a porous medium permeated by aligned fractures-a new poroelastic approach: Journal of Geophysics and Engeerning, 9(2), 115–26.
Gurevich, B., Makarynska, D., Paula, O., and Pervukhina, M., 2010, A simple model for squirt-flow dispersion and attenuation in fluid-saturated granular media: Geophysics, 75, N109–N120.
Liu, S. G., Shan, Y. M., and Huang, S. J., 2006, Characteristics and variation pattern of acoustic parameters of carbonate reservoir rocks in Tahe oil field Tarim basin: Oil & Gas Geology, 27(3), 399–404.
Müller, T. B., Gurevich, B., and Lebedev, M., 2010, Seismic wave attenuation and dispersion resulting from waveinduced flow in porous rocks—a review: Geophysics, 75, 75A147–75A164.
Nie, J. X., Ba, J., Yang, D. H., Yan, X. F., Yuan, Z. Y. and Qiao, H. P., 2012, BISQ model based on a Kelvin-Voigt viscoelastic frame in a partially saturated porous medium: Applied Geophysics, 12(2), 213–222.
Sharma, R., Prasad, M., Batzle, M., and Vega, S., 2013, Sensitivity of flow and elastic properties to fabric heterogeneity in carbonates: Geophysical Prospecting, 61, 270–286.
Verwer, K., Eberli, G., Baechle, G., and Weger, R., 2010, Effect of carbonate pore structure on dynamic shear moduli: Geophysics, 75(1), E1–E8.
Walsh, J. B., 1965, The effects of cracks on the compressibility of rock: Journal of Geophysical Researc h, 70, 381–389.
Weger, R. J., Baechle, G. T., Masaferro, J. L., and Eberli, G. P., 2004, Effects of pore structure on sonic velocity in carbonates: 74th Ann. Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts, 1774.
Xu, S. Y. and Payne, M. A., 2009, Modeling elastic properties in carbonate rocks: The Leading Edge, 28(2), 66–74.
Zhou, W. and Yang, H. X., 2006, Effects of fractures of rock on elastic property of rock and velocity-porosity relation: Oil Geophysical Prospecting, 40(3), 334–338.
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This work was supported by the Natural Science Foundation of China (No. 41274138).
Pan Jian-Guo, senior geophysicist, obtained his B.S. in Exploration Geophysics from ChengDu University of Technology and his Ph.D. in petroleum geology from China University of Geosciences in 1983 and 2010, respectively. He is presently working in the Northwest Branch of RIPED. His research interests are petroleum exploration, the seismic properties of reservoirs, and rock physics.
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Pan, JG., Wang, HB., Li, C. et al. Effect of pore structure on seismic rock-physics characteristics of dense carbonates. Appl. Geophys. 12, 1–10 (2015). https://doi.org/10.1007/s11770-014-0477-1
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DOI: https://doi.org/10.1007/s11770-014-0477-1