Stress-dependent shear wave splitting and permeability in fractured porous rock

Katsuki, Daisuke; Gutierrez, Marte; Almrabat, Abdulhadi

doi:10.1016/j.jrmge.2018.08.004

Cited by 16 publications

(7 citation statements)

References 26 publications

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“…S2-wave is polarized in the direction orthogonal to the fracture plane, i.e. fracture orientation is 90° with respect to the plane of wave propagation [5,15,16] (red wave in Fig. 2(b)).…”

Section: Resultsmentioning

confidence: 99%

“…At laboratory scale, ultrasonic waves are shown to be sensitive to the different elements of geologic formations such as stress conditions, fluid saturations, internal structures of the intact rocks, and presence of fractures (or cluster of fractures) in the rock (e.g. [1][2][3][4][5]). Due to the lower cost, remote geophysical methods that use seismic waves are usually used in field (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Effect of fracture orientation on ultrasonic wave signatures

Ghazanfari

2020

E3S Web Conf.

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Fluid flow through low-permeable rock masses is dominated by transport through discontinuities such as fractures, faults, and joints present in the rock. These discontinuities are beneficial for some geo-resources such as geothermal, oil and gas reservoir, but detrimental for other applications such as CO2 storage and hazardous waste isolation. Fracture orientation plays a critical role during the design of the geo-resources. Often times, ultrasonic waves are used in the field to locate and characterize the fractures. In this study, the effect of fracture orientation (0° to 90°) on ultrasonic wave signatures was investigated by conducting a series of experiments on a granite rock with a longitudinal fracture under confining pressures of 15, 30, and 45 MPa. Ultrasonic wave signatures during the experiment were collected using the ultrasonic transducers embedded in the core holders that were attached to the two ends of the specimen. Results indicated sensitivity of the ultrasonic wave velocities, waveforms, and amplitudes (cross-polarized S-waves) to the fracture orientation.

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“…S2-wave is polarized in the direction orthogonal to the fracture plane, i.e. fracture orientation is 90° with respect to the plane of wave propagation [5,15,16] (red wave in Fig. 2(b)).…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of fracture orientation on ultrasonic wave signatures

Ghazanfari

2020

E3S Web Conf.

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“…Nevertheless, certain geophysical methods are applicable for inverting the stress field. [39][40][41] For example, a microseismic event 42,43 can be considered; however, it only confirms the relative state of stress and its redistribution, 44 thereby reflecting the considerable amount of work required for improving conventional methods. Herein, considering the actual situation of no.…”

Section: Mechanical Rationalementioning

confidence: 99%

Case study on the mining‐induced stress evolution of an extra‐thick coal seam under hard roof conditions

Xie

Gao

et al. 2020

Energy Science & Engineering

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A strong mining disturbance may cause the superposition of local stresses and serious disasters such as crushed supports and severely destroyed roadways. To study the distribution law of mining‐induced stress under hard roof conditions, an advance abutment pressure distribution model was developed. By monitoring the support pressure, a novel method of reckoning intensive factors was proposed, and then, the pressure distribution characteristics were obtained. An innovative in situ test of the mining‐induced stress increment was performed. At the Tongxin coal mine, the field monitoring of no. 8309 working face revealed the following. (a) The peak position of the fully mechanized working face with a hard roof was 5.9 m away from the mining face in which the average intensive factor K was 1.48. The pressure of the single props developed could be roughly divided into the fluctuation, slow increase, and stable stages. (b) A theoretical model of the stress evolution of the working face was proposed. Using an in situ uniaxial compression test, a law governing the variation of the advance abutment pressure was developed. The peak strength was reported to be 36 MPa, which is consistent with the advance prop pressure. (c) Mining‐induced stress violently fluctuated during the process of top coal caving; the K values in the supports in the middle of the working face and their rates of growth were apparently higher than those in the end supports. A Gaussian distribution of K was established for this phenomenon. The results obtained provide first‐hand data for safe and efficient mining under similar geological conditions.

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“…These methods can improve the conductivity of reservoirs by changing the fracture characteristics, thereby accelerating oil and gas flow and increasing oil and gas production (Wang et al, 2018;Liu et al, 2010). Fractured rocks in deep reservoirs under different geological environment of high geo-stress and high liquid pressure significantly affect the mechanical behaviour of deep oil and gas reservoirs, especially for the permeability of reservoir fractured rocks (Katsuki et al, 2019;Zhao et al, 2019). Given that fractures generally have crack-like shapes, they are more susceptible to stress than porous rocks, causing liquid behaviour in fractures to be strongly pressure dependent.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on permeability in fractured rock under different pressure conditions

Zhang¹

2021

Acta Geodynamica Et Geomaterialia

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Oil and gas are the main reserves in the fractures of rocks. Under different pressure conditions, fracture permeability of reservoir rock directly affects the flow of oil and gas, which is an important object of oil and gas exploration and development. The permeability of single fractured rock and double fractured rock under different pressure conditions was studied by using highprecision hydro-mechanics coupled triaxial experimental equipment. The experimental scheme is as follows: (i) permeability test under increasing confining pressure, (ii) permeability test under increasing liquid pressure, (iii) permeability test under cyclic loading and unloading deviatoric stress and (iv) permeability test under synchronously increasing confining pressure and deviatoric stress. Results show that the entire change of permeability is irreversibly reduced. This is due to the presence of residual factors in permeability after the dilation cycle and the recompaction cycle ends. On the basis of the dual medium model of fracture, the permeability model of fractured rock is proposed considering the interaction among fracture system, matrix system and expansion deformation of fracture under external stress. The simulation results of the model are in good agreement with the experimental results. These results can provide an important basis for the prediction of permeability of fractured rock and efficient oil and gas exploitation.

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Stress-dependent shear wave splitting and permeability in fractured porous rock

Cited by 16 publications

References 26 publications

Effect of fracture orientation on ultrasonic wave signatures

Effect of fracture orientation on ultrasonic wave signatures

Case study on the mining‐induced stress evolution of an extra‐thick coal seam under hard roof conditions

Experimental investigation on permeability in fractured rock under different pressure conditions

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