scholarly journals Relating Hydraulic-Electrical-Elastic Properties of Natural Rock Fractures at Elevated Stress and Associated Transient Changes of Fracture Flow

2020 ◽  
Author(s):  
Kazuki Sawayama ◽  
Takuya Ishibashi ◽  
Fei Jiang ◽  
Takeshi Tsuji ◽  
Yasuhiro Fujimitsu
Keyword(s):  
Elastic Properties ◽  
Fracture Flow ◽  
Rock Fractures ◽  
Natural Rock

scholarly journals Relating Hydraulic-Electrical-Elastic Properties of Natural Rock Fractures at Elevated Stress and Associated Transient Changes of Fracture Flow

2021 ◽  
Author(s):  
Kazuki Sawayama ◽  
Takuya Ishibashi ◽  
Fei Jiang ◽  
Takeshi Tsuji ◽  
Yasuhiro Fujimitsu
Keyword(s):  
Elastic Properties ◽  
Fracture Flow ◽  
Rock Fractures ◽  
Natural Rock

scholarly journals Relating Hydraulic-Electrical-Elastic Properties of Natural Rock Fractures at Elevated Stress and Associated Transient Changes of Fracture Flow

2021 ◽  
Author(s):  
Kazuki Sawayama ◽  
Takuya Ishibashi ◽  
Fei Jiang ◽  
Takeshi Tsuji ◽  
Yasuhiro Fujimitsu
Keyword(s):  
Elastic Properties ◽  
Fracture Flow ◽  
Rock Fractures ◽  
Natural Rock

scholarly journals Relating Hydraulic–Electrical–Elastic Properties of Natural Rock Fractures at Elevated Stress and Associated Transient Changes of Fracture Flow

2021 ◽  
Vol 54 (5) ◽  
pp. 2145-2164
Author(s):  
K. Sawayama ◽  
T. Ishibashi ◽  
F. Jiang ◽  
T. Tsuji ◽  
Y. Fujimitsu
Keyword(s):  
Elastic Wave ◽  
Wave Velocity ◽  
Hydraulic Properties ◽  
Fractured Rock ◽  
Three Dimensional ◽  
Elastic Wave Velocity ◽  
Fracture Flow ◽  
Rock Fractures ◽  
Flow Area ◽  
Natural Rock

AbstractMonitoring the hydraulic properties within subsurface fractures is vitally important in the contexts of geoengineering developments and seismicity. Geophysical observations are promising tools for remote determination of subsurface hydraulic properties; however, quantitative interpretations are hampered by the paucity of relevant geophysical data for fractured rock masses. This study explores simultaneous changes in hydraulic and geophysical properties of natural rock fractures with increasing normal stress and correlates these property changes through coupling experiments and digital fracture simulations. Our lattice Boltzmann simulation reveals transitions in three-dimensional flow paths, and finite-element modeling enables us to investigate the corresponding evolution of geophysical properties. We show that electrical resistivity is linked with permeability and flow area regardless of fracture roughness, whereas elastic wave velocity is roughness-dependent. This discrepancy arises from the different sensitivities of these quantities to microstructure: velocity is sensitive to the spatial distribution of asperity contacts, whereas permeability and resistivity are insensitive to contact distribution, but instead are controlled by fluid connectivity. We also are able to categorize fracture flow patterns as aperture-dependent, aperture-independent, or disconnected flows, with transitions at specific stress levels. Elastic wave velocity offers potential for detecting the transition between aperture-dependent flow and aperture-independent flow, and resistivity is sensitive to the state of connection of the fracture flow. The hydraulic-electrical-elastic relationships reported here may be beneficial for improving geophysical interpretations and may find applications in studies of seismogenic zones and geothermal reservoirs.

Laboratory investigation of nonlinear flow characteristics through natural rock fractures

2019 ◽  
Vol 52 (4) ◽  
pp. 519-528
Author(s):  
Mohammad Javad Nasri Fakherdavood ◽  
Ahmad Ramezanzadeh ◽  
Human Jenabi
Keyword(s):  
Laboratory Investigation ◽  
Flow Characteristics ◽  
Nonlinear Flow ◽  
Rock Fractures ◽  
Natural Rock

Closure Behaviour of Natural Rock Fractures

AAPG Bulletin ◽  
2000 ◽  
Vol 84 ◽  
Author(s):  
DUAN, YUTING, Imperial College
Keyword(s):  
Rock Fractures ◽  
Natural Rock

scholarly journals A universal elliptical disc (UED) model to represent natural rock fractures

2021 ◽  
Author(s):  
Jun Zheng ◽  
Jichao Guo ◽  
Jiongchao Wang ◽  
Honglei Sun ◽  
Jianhui Deng ◽  
...  
Keyword(s):  
Rock Fractures ◽  
Natural Rock

Evolution of contact area and aperture during the shearing process of natural rock fractures

2021 ◽  
pp. 106236
Author(s):  
M.A. Pirzada ◽  
M. Bahaaddini ◽  
O. Moradian ◽  
H. Roshan
Keyword(s):  
Contact Area ◽  
Rock Fractures ◽  
Natural Rock

A New Geometrical Model of Fluid Flow in Rock Fractures for Valid Application of the Cubic Law

2014 ◽  
Vol 580-583 ◽  
pp. 841-846 ◽  
Author(s):  
Hong Guang Zhu ◽  
Yao Dong Jiang ◽  
Cheng Yi ◽  
He Ping Xie
Keyword(s):  
Good Accuracy ◽  
Order Approximation ◽  
Geometrical Model ◽  
Equivalent Model ◽  
Rock Fractures ◽  
Local Fracture ◽  
Cubic Law ◽  
Natural Rock ◽  
Flow Through ◽  
Physical Laws

The cubic law (CL) is one of the most commonly applied physical laws for flow through rock fractures and fractured media, but many studies indicate that the CL is often not adequate. We investigate the establishment conditions of valid applying the “cubic law” to flow in fractures. A dimensional analysis of the N-S equations yields three conditions for the applicability of cubic law, as a leading order approximation in a local fracture segment with parallel walls. These conditions may not be met in many natural rock fractures as whole and demonstrate that the “cubic law” should be exactly applied in local segments (local cubic law, LCL). In this way, a new 2D discrete equivalent model for natural rough fractures is introduced, and its equivalent aperture and flow formulation are derived. By comparing the developed model and experimental results of different fractures, good accuracy was found, and the model was validated. The model could be useful for theory studies of flows through real rock fractures.

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