1887
Volume 73, Issue 6
  • E-ISSN: 1365-2478

Abstract

ABSTRACT

Deep‐strata high‐pressure reservoirs are a key research area in subsurface resource exploration. The complex mix of in situ pressure, anisotropy and fluid saturation in rocks leads to unclear seismic responses and uncertainties in wave propagation. Using acoustoelasticity theory and assuming weak anisotropy, we derived equations for the elastic parameters of stressed orthotropic media. These equations use anisotropic parameters to describe the unstressed elastic properties of orthotropic media. Then, using the Gassmann equation and low‐frequency poro‐elasticity, we found elastic parameters for single fluid‐saturated orthotropic media. Non‐welded interfaces serve as a reasonable approximation for tiny fractures and are ubiquitous in subsurface formations, and the viscous fluid present within these interfaces contributes to the observable attenuation of seismic waves. Using elastic parameters of stressed, fluid‐saturated orthotropic media, we formulated reflection and transmission coefficient equations for these interfaces based on linear‐slip theory. Using these equations, we analysed how stress, fluid saturation and interface changes affect seismic response and wave propagation. We then analysed how frequency, porosity, viscosity, fracture weakness and other physical properties affect seismic behaviour within and at the medium's interface. By constructing exact equations, we have achieved a more realistic simulation of subsurface seismic response. This enhancement in simulation accuracy facilitates a deeper understanding of the seismic response patterns observed in deep and complex subsurface reservoirs. Furthermore, it provides a solid theoretical foundation for fluid identification and reservoir prediction in actual subsurface reservoir scenarios.

© 2025 European Association of Geoscientists & Engineers. © 2025 European Association of Geoscientists & Engineers.
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2025-07-15
2026-02-11

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Exact Equation for Seismic Response of Viscous Non‐Welded Interface in Saturated Orthotropic Media Under the In Situ Stress
Geophysical Prospecting 73, e70052 (2025); https://doi.org/10.1111/1365-2478.70052
/content/journals/10.1111/1365-2478.70052
/content/journals/10.1111/1365-2478.70052
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  • Article Type: Research Article
Keyword(s): anisotropy; mathematical formulation; modelling; velocity analysis; wave

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