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A patchy-saturated rock physics model for tight sandstone based on microscopic pore structures

  • Borehole geophysics and rock properties
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Abstract

The wave-induced local fluid flow mechanism is relevant to the complex heterogeneity of pore structures in rocks. The analysis of the local fluid flow mechanism is useful for accurately describing the wave propagation characteristics in reservoir rocks. In the exploration and production of hydrocarbon reservoirs, the real stratum may be partially saturated with a multi-phase fluid mixture in general. Therefore, it is of great significance to investigate the wave velocity dispersion and attenuation features in relation to pore structures and fluids. In this work, the characteristics of fabric microstructures are obtained on the basis of pressure dependency of dry rock moduli using the effective medium theory. A novel anelasticity theoretical model for the wave propagation in a partially-saturated medium is presented by combining the extended Gurevich squirt-flow model and White patchy-saturation theory. Numerical simulations are used to analyze wave propagation characteristics that depend on water saturation, external patchy diameter, and viscosity. We consider a tight sandstone from the Qingyang area of the Ordos Basin in west China and perform ultrasonic measurements under partial saturation states and different confining pressures, where the basic properties of the rock are obtained at the full gas saturation. The comparison of experimental data and theoretical modeling results shows a fairly good agreement, indicating that the new theory is effective.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (Grant no. 41704109) and the Jiangsu Province Outstanding Youth Fund Project (Grant no. BK20200021).

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Authors and Affiliations

  1. School of Earth Sciences and Engineering, Hohai University, Nanjing, 211100, China

    Chun-Fang Wu, Jing Ba, José M. Carcione, Tobias M. Müller & Lin Zhang

  2. National Institute of Oceanography and Applied Geophysics (OGS), Trieste, 34010, Italy

    José M. Carcione

Authors
  1. Chun-Fang Wu
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  2. Jing Ba
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  3. José M. Carcione
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  4. Tobias M. Müller
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  5. Lin Zhang
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Corresponding author

Correspondence to Jing Ba.

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Wu Chun-Fang obtained his Ph.D. degree from Hohai University in 2020. Her major is earth exploration and information technology, and her main research interests are rock physics and wave propagation theory in porous media.

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Wu, CF., Ba, J., Carcione, J.M. et al. A patchy-saturated rock physics model for tight sandstone based on microscopic pore structures. Appl. Geophys. 19, 147–160 (2022). https://doi.org/10.1007/s11770-022-0938-2

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  • DOI: https://doi.org/10.1007/s11770-022-0938-2

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