Effect of viscous cross coupling between two immiscible fluids on elastic wave propagation and attenuation in unsaturated porous media

Lo, Wei Cheng; Yeh, Chih-Hung; Lee, Jhe Wei

doi:10.1016/j.advwatres.2015.06.002

Cited by 8 publications

(4 citation statements)

References 32 publications

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“…Over the past few decades, theoretical and experimental studies on the connection between elastic wave attributes and physical properties of a fluid‐bearing porous medium have attracted the attention of many scholars in fields of porous medium flow and hydrogeology [ Sabatier et al ., ; Beresnev and Johnson , ; Cowin , ; Vogler and Chrysikopoulos , ; Lo et al ., ; Elkhoury et al ., ; Manga et al ., ; Candela et al ., ; Lo et al ., ; Stewart and Shaw , ; Hamzehpour et al ., ]. High‐frequency acoustic vibrations and ultrasonic imaging were used to evaluate the permeability and porosity of various media [ Sabatier et al ., ; Moore and Attenborough , ; Geller and Myer , ; Sabatier et al ., ; Rossel and McBratney , ; Cowin , ; Xiang and Sabatier , ].…”

Section: Introductionmentioning

confidence: 99%

The dynamic response of the water retention curve in unsaturated soils during drainage to acoustic excitations

Yang

Hsu

et al. 2017

Water Resources Research

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We examined the effects of acoustic excitations on the water retention curve, i.e., the relationship between capillary pressure (PCtrue) and water saturation true(SWtrue) in unsaturated porous media, during drainage. The water retention curves were measured under static and dynamic conditions, where water was withdrawn from a sandbox with three different pumping rates, 12.6, 19.7, and 25.2 mL/s. Excitations with frequencies of 75, 100, 125, and 150 Hz were applied. The acoustic excitations had no effect on the static water retention curve but altered the dynamic water retention curve. The acoustic excitations lowered the dynamic PC, especially under the dynamic condition where the pumping rate was 25.2 mL/s and when SW varied between 0.6 and 0.95. The differences between the capillary pressures measured under static and dynamic conditions decreased when acoustic excitations were applied. We link this finding to the change in contact angle induced by the acoustic excitation. The dynamic coefficients, τ, for the dynamic water retention curves that we fitted to the experimental data were smaller with than without acoustic excitations. We attribute the decrease of the dynamic coefficient to the combination of the increase in the permeability and the decline in the air‐entry pressure caused by adding acoustic excitations.

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Section: Introductionmentioning

confidence: 99%

The dynamic response of the water retention curve in unsaturated soils during drainage to acoustic excitations

Yang

Hsu

et al. 2017

Water Resources Research

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“…Therefore, including the impact of formation rock heterogeneity in the poroelasticity model becomes necessary. The physics of multiphase fluid flow in porous media coupled with elastic wave transmission is gaining popularity [6]. It is useful in numerous technical applications, including seismic wave imaging and acoustic wave excitation, to improve hydrocarbon recovery from underground oil reservoirs and NAPL (nonaqueous phase liquid) polluted sites [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Pore Pressure Diffusion Waves Transmission in Oil Reservoir

Mohammed Bashir Abdullahi,

Shiferaw Regassa Jufar,

Jang Hyun Lee

et al. 2023

ARFMTS

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Recent studies on seismic wave excitation have revealed that mesoscopic wave-induced fluid flow (WIFF) is a process that attenuates the compressional (P) waves in reservoir rocks at seismic frequency bands. Fluid flow and Biot's slow diffusion (pressure) waves are produced when the P-waves create fluid-pressure gradients at mesoscopic-scale heterogeneities. Pore pressure continuity can be sustained by converting seismic energy into diffusion waves that diffuse away from the interfaces or boundaries. Biot’s diffusion waves fail to comply with a square-law approach because of their slow propagation velocity and higher attenuation. It is currently uncertain how to characterize reservoir fluids in mature oil reservoirs during seismic wave-based enhanced oil recovery (EOR). A simplified 1D two-layer reservoir model was investigated in this study. The findings demonstrate that diffusion wave propagation in oil reservoirs is frequency-dependent and affected by rock permeability and fluid viscosity. At a formation layer interface, it was discovered that diffusion waves obeyed the accumulation-depletion relationship rather than the reflection-refraction approach. Therefore, pore pressure diffusion waves can characterize reservoir fluid during seismic EOR and monitor the CO2 front in depleted reservoirs during storage for CCUS projects. It can also detect shale gas transport in low permeability layers and identify the propagation of fractures during gas/oil recovery.

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“…In recent years, with the improvement of mathematics solving ability and engineering precision requirements, basic research on wave propagation in completely saturated soils. In recent years, with the improvement of mathematics solving ability and engineering precision requirements, several researchers, including Lo [19], Lo et al [20], and Liu et al [21][22][23], have implemented works on the bulk and Rayleigh waves propagation in three-phase partially saturated soil. These works concluded that a kind of longitudinal wave (typically named P3 wave) exists in three-phase soil, and the liquid saturation has a significant effect on the bulk and Rayleigh waves.…”

Section: Introductionmentioning

confidence: 99%

Bulk and Rayleigh Waves Propagation in Three-Phase Soil with Flow-Independent Viscosity

et al. 2022

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The flow-independent viscosity of the soil skeleton has significant influence on the elastic wave propagation in soils. This work studied the bulk and Rayleigh waves propagation in three-phase viscoelastic soil by considering the contribution of the flow-independent viscosity from the soil skeleton. Firstly, the viscoelastic dynamic equations of three-phase unsaturated soil are developed with theoretical derivation. Secondly, the explicit characteristic equations of bulk and Rayleigh waves in three-phase viscoelastic soil are yielded theoretically by implementing Helmholtz resolution for the displacement vectors. Finally, the variations of the motion behavior for bulk and Rayleigh waves with physical parameters such as relaxation time, saturation, frequency, and intrinsic permeability are discussed by utilizing calculation examples and parametric analysis. The results reveal that the influence of soil flow-independent viscosity on the wave speed and attenuation coefficient of bulk and Rayleigh waves is significantly related to physical parameters such as saturation, intrinsic permeability, and frequency.

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Effect of viscous cross coupling between two immiscible fluids on elastic wave propagation and attenuation in unsaturated porous media

Cited by 8 publications

References 32 publications

The dynamic response of the water retention curve in unsaturated soils during drainage to acoustic excitations

The dynamic response of the water retention curve in unsaturated soils during drainage to acoustic excitations

Pore Pressure Diffusion Waves Transmission in Oil Reservoir

Bulk and Rayleigh Waves Propagation in Three-Phase Soil with Flow-Independent Viscosity

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