A statistical index indicating the degree and mechanical effects of grain size heterogeneity in rocks

Z Han, L Zhang, R Azzam, J Zhou, S Wang - Engineering Geology, 2021 - Elsevier
Mineral grain size heterogeneity is one of the fundamental reasons leading to differences in
rock mechanical behaviours. Several indices have been proposed to quantify grain size …

Characterization of immiscible fluid displacement processes with various capillary numbers and viscosity ratios in 3D natural sandstone

T Tsuji, F Jiang, KT Christensen - Advances in Water Resources, 2016 - Elsevier
To characterize the influence of reservoir conditions upon multiphase flow, we calculated
fluid displacements (drainage processes) in 3D pore spaces of Berea sandstone using two …

Pore structure changes and its stress-sensitive behavior in sandstone under cyclic stress: Implication for underground gas storage

G Deng, J Zhou, S Tian, X Xian, L Zhou… - Gas Science and …, 2023 - Elsevier
The cyclic gas injection-extraction process during underground gas storage (UGS) operation
may alter the pore structure and stress sensitivity in the reservoir rock, which can affect the …

An efficient preconditioner for the fast simulation of a 2D Stokes flow in porous media

B Quaife, P Coulier, E Darve - International Journal for …, 2018 - Wiley Online Library
We consider an efficient preconditioner for a boundary integral equation (BIE) formulation of
the two‐dimensional Stokes equations in porous media. While BIEs are well‐suited for …

[PDF][PDF] Laboratory measurements on electric and elastic properties of fractured geothermal reservoir rocks under simulated EGS conditions

K Sawayama, K Kitamura, Y Fujimitsu - GRC Transactions, 2018 - researchgate.net
For developing the technique of Enhanced Geothermal System (EGS), the estimation of
injected water distribution is essential. To estimate water saturation changes deep under the …

Effects of water saturation, fracture and salinity on electric and elastic properties of fractured geothermal rocks

K Sawayama, K Kitamura, Y Fujimitsu - journal of the geothermal …, 2019 - jstage.jst.go.jp
Fluid-flow tests and simultaneous measurements of water saturation (Sw), complex
resistivity and elastic wave velocity were conducted in the laboratory to elucidate the …

Seismic and strain detection of heterogeneous spatial distribution of CO2 in high-permeable sandstone

K Kitamura, O Nishizawa, KT Christensen, T Ito… - International Journal of …, 2018 - Elsevier
In this study, we attempt to clarify the heterogeneous CO 2 distribution in homogeneous and
high-permeability porous sandstone (Mt. Simon sandstone: 105 mD) using both physical …

Pore-scale numerical modeling of coupled fluid flow and medium geometrical deformations in an unconsolidated porous medium

B Nasrollahzadeh, HAA Amiri… - The European Physical …, 2019 - epjplus.epj.org
The interplay of fluid flow and medium grains' deformation/movement in unconsolidated
porous media was numerically studied. The numerical simulations were done through …

Hydrologic and elastic properties of CO2 injected rock at various reservoir conditions: Insights into quantitative monitoring of injected CO2

T Tsuji, T Ikeda, F Jiang - Energy Procedia, 2017 - Elsevier
We calculated CO 2 displacements in 3D natural sandstone (digital rock model) under
various reservoir conditions using two-phase lattice Boltzmann (LB) simulations, and …

Mechanism of Imbibition in Shale Pores Based on Imbibition Nuclear Magnetic Experiment and LBM Method

H Cheng, J Zhang, R Leng, S Chang - … and Technology of Fuels and Oils, 2021 - Springer
The spontaneous imbibition of fracturing fluid in the shale matrix is one of the main reasons
for the low hydraulic fracturing flowback rate. The distribution characteristics of fracturing …