Anisotropy of elastic moduli, P-wave velocities, and thermal conductivities of Asan Gneiss, Boryeong Shale, and Yeoncheon Schist in Korea

Kim, Hanna; Cho, Jung-Woo; Song, Insun; Min, Kyoung-Bok

doi:10.1016/j.enggeo.2012.07.015

Cited by 133 publications

(36 citation statements)

References 33 publications

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“…Hou et al (2016) compared the behavior of shale, coal and sandstone specimens subjected to high-pressure fluid-driven 1 3 fracturing, and observed how different microscopic composition of these materials leads to important differences in the measured values of mechanical properties, strains and crack patterns. Kim et al (2012) also performed a comparative study between shale, gneiss and schist rocks samples, investigating the influence of their composition and direction of bedding planes on their thermo-mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study and Numerical Modeling of Fracture Propagation in Shale Rocks During Brazilian Disk Test

et al. 2018

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Reliable prediction of fracture process in shale-gas rocks remains one of the most significant challenges for establishing sustained economic oil and gas production. This paper presents a modeling framework for simulation of crack propagation in heterogeneous shale rocks. The framework is on the basis of a variational approach, consistent with Griffith's theory. The modeling framework is used to reproduce the fracture propagation process in shale rock samples under standard Brazilian disk test conditions. Data collected from the experiments are employed to determine the testing specimens' tensile strength and fracture toughness. To incorporate the effects of shale formation heterogeneity in the simulation of crack paths, fracture properties of the specimens are defined as spatially random fields. A computational strategy on the basis of stochastic finite element theory is developed that allows to incorporate the effects of heterogeneity of shale rocks on the fracture evolution. A parametric study has been carried out to better understand how anisotropy and heterogeneity of the mechanical properties affect both direction of cracks and rock strength.

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Section: Introductionmentioning

confidence: 99%

Experimental Study and Numerical Modeling of Fracture Propagation in Shale Rocks During Brazilian Disk Test

et al. 2018

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“…2012a, 2012b; Josh et al, 2012;Cho et al, 2012;Kim et al, 2012;Vasin et al, 2013;Horne, 2013;Das, 2013;Ma and Chen, 2014b;Tang, 2014;Heng et al, 2014). The data on the anisotropic strengths of different shales collected from tri-axial compression experiments and the literature are listed in Table 2.…”

Section: The Anisotropic Strength Of Shale Rockmentioning

confidence: 92%

A wellbore stability analysis model with chemical-mechanical coupling for shale gas reservoirs

Chen

2015

Journal of Natural Gas Science and Engineering

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“…Zhang et al (2007) emphasized the deformation components triggering seismic anisotropy of ultra-high pressure eclogite. Kim et al (2012) discussed the anisotropy of three parameters (Young's module, P-wave velocity and coefficient of heat conductivity) of gneiss, schist and shale, and their interrelationships. Liu et al (2008) compared experimental data with the corrected in-site P-wave velocity of exploration seismic profiles, determining the lithological properties of the crust in the northeastern margin of the Tibetan Plateau.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Seismic Anisotropy of the Typical Slate from the Gaoligong Mountains, Yunnan Province, China

Guo

Wang

Zhao

et al. 2014

Chinese J of Geophysics

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Slate, as one of the low-degree metamorphic rocks, is widely distributed in China. Research on the seismic velocity of slate can help distinguish this kind of transitional rocks as well as understand anisotropy of the upper crust. This paper presents laboratory research on the seismic velocity of slate samples collected from the Bingzhongluo district of Yunnan Province, and part of the experiment was conducted at the Dalhousie High Pressure Laboratory, Canada. The laboratory testing yielded the seismic velocities in different structural directions as a function of pressures. The seismic velocities in the three directions (X, Y and Z) are 6.58, 6.46 and 5.91 km/s at the confining pressure of 600 MPa, respectively, with an average velocity of 6.30 km/s. S wave has an average velocity of 3.62 mm/s and a VP/VS ratio of 1.74. The preliminary analysis shows the changing law of seismic velocities and shear wave splitting of slate, revealing that the seismic anisotropy of slate decreases significantly with pressurization at low confining pressures (<150 MPa). This is primarily attributed to the orientation alignment of microcracks within slate. With progressive increase of confining pressure (>150 MPa), all the microcracks are largely closed. Thus, the orientation alignment of flaky minerals such as biotite and actinolite is a leading factor for seismic anisotropy. With the pressure up to 600 MPa, the anisotropy of VP and VS stabilizes at 13% and 16%. Therefore, laboratory data and seismic property of the slate documented in this paper will provide basis for determination of preferential orientations of microcracks in the upper crust, anisotropy analysis in the shallow crust, and geophysical model constraints.

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Anisotropy of elastic moduli, P-wave velocities, and thermal conductivities of Asan Gneiss, Boryeong Shale, and Yeoncheon Schist in Korea

Cited by 133 publications

References 33 publications

Experimental Study and Numerical Modeling of Fracture Propagation in Shale Rocks During Brazilian Disk Test

Experimental Study and Numerical Modeling of Fracture Propagation in Shale Rocks During Brazilian Disk Test

A wellbore stability analysis model with chemical-mechanical coupling for shale gas reservoirs

Analysis of Seismic Anisotropy of the Typical Slate from the Gaoligong Mountains, Yunnan Province, China

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