Effects of porosity, orientation and connectivity of microcracks on dispersion and attenuation of fluid-saturated rocks using an upscaling numerical modelling of the squirt flow mechanism

Tang, Genyang; Guo, Fenghua; Wang, Shangxu; Sun, Chao; Liu, Tao; Dong, Caihua; He, Yanxiao; Han, Xu

doi:10.1080/08123985.2021.1982377

Cited by 2 publications

(1 citation statement)

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“…However, most sedimentary rocks are porous, which indicates that the FF‐WIFF needs to be studied in the context of porous background. This situation was explored by several authors through solving the Biot quasi‐static poroelastic equations numerically (e.g., Rubino et al., 2013, 2014, 2016, 2017; Caspari et al., 2019; Grab et al., 2017; Hunziker et al., 2018; Quintal et al., 2014; Tang et al., 2021; Vinci et al., 2014). These studies found that the wave‐induced fluid pressures in the fractures and porous background are different; hence, apart from the FF‐WIFF, the FB‐WIFF (Fracture—Background Wave‐induced Fluid Flow) also occurs.…”

Section: Introductionmentioning

confidence: 99%

Dynamic SV‐Wave Signatures of Fluid‐Saturated Porous Rocks Containing Intersecting Fractures

2022

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Detecting fracture intersections is crucial for understanding rock hydraulic properties. For this purpose, we study the dynamic SV‐wave signatures of fluid‐saturated porous rocks containing intersecting fractures. A theoretical model is derived using the dynamic Biot's poroelasticity equations. Using this model, we analyze the features of SV‐waves and compare to those of previously studied P‐waves. The results show that the dispersion and attenuation of SV‐waves caused by elastic scattering and FF‐WIFF (Fracture‐Fracture Wave‐induced Fluid Flow) have a similar dependence on properties of intersecting fractures and fluid as those of P‐waves. However, the FB‐WIFF (Fracture‐Background Wave‐induced Fluid Flow) causes much smaller dispersion and attenuation for SV‐waves than for P‐waves. In particular, such dispersion and attenuation of SV‐waves are negligibly small for the orthogonally intersecting fractures regardless of wave incidence angles. In addition to the dispersion and attenuation, the WIFF and elastic scattering also greatly affect the anisotropy properties, which gives rise to frequency‐dependent velocity and attenuation anisotropies for both SV‐ and P‐ waves. Such anisotropy properties are sensitive to fracture intersection angles and are quite different between SV‐ and P‐ waves. These complementary features of SV‐ and P‐ waves provide the basis for fracture intersection detection using the combined features of these two waves. By comparing our model to the known results for the limiting cases, we validate our model.

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