Multiscale Poromechanical Modeling of Shales Incorporating Microcracks

Dubey, Vasav; Mashhadian, Mohammad; Abedi, Sara; Noshadravan, Arash

doi:10.1007/s00603-019-01833-5

Cited by 8 publications

(7 citation statements)

References 60 publications

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“…Sample A3 shows very high anisotropy parameters due to its greater clay content relative to A6, in addition to a more anisotropic stiffness response of the matrix. For A3, ℂ 𝑐𝑐𝑐𝑐𝑐𝑐 has components C 11 = 91.6, C 12 = 48.2, C 13 = 22.4, C 33 = 29.0, and C 44 = 5.1 GPa, which are very similar to those obtained by [18]. The ratio V P0 / V S0 tends to be slightly lower for the upscaled results than literature models.…”

Section: Comparison With Microseismic Datasupporting

confidence: 75%

Micromechanical characterisation of overburden shales in the Horn River Basin through nanoindentation

Charlton

Rouainia

Aplin

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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The paper presents a micromechanical characterisation of Fort Simpson shale, which overlies unconventional gas-producing lithologies in the Horn River Basin, NW Canada. The Fort Simpson formation is clay-rich and microseismic data recorded during hydraulic fracturing events in the underlying reservoir has shown the formation acts as a barrier to fracture development, with a notably anisotropic seismic response. Samples were prepared from core fragments and the composition and texture of the shale was characterised using X-ray diffraction, mercury injection porosimetry and scanning electron microscopy (SEM). Nanoindentation testing was used to obtain the mechanical response of the shale microstructure, at grain-scale. The indentation was conducted on a grid pattern and samples were oriented both parallel and perpendicular to the bedding plane to assess the inherent mechanical anisotropy. Chemical analysis of the grids was also undertaken through SEM/EDS (energy dispersive X-ray spectroscopy) and the coupled chemo-mechanical data was used to characterise the material phases of the shale through a statistical clustering procedure. The results show that Fort Simpson shale broadly consists of a soft clay phase, with strongly anisotropic elastic stiffness, and stiffer but effectively isotropic grains of quartz and feldspar. A simple upscaling scheme was also applied to link the grain-scale elastic stiffness to the field-scale microseismic data.

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Section: Comparison With Microseismic Datasupporting

confidence: 75%

Micromechanical characterisation of overburden shales in the Horn River Basin through nanoindentation

Charlton

Rouainia

Aplin

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…Recently, Abedi, Slim, and Ulm (2016) and Dubey et al. (2019) have back analyzed the TI elastic constants on various shales and found much higher stiffness values, closer to those obtained for individual clay particles (Wang et al., 2001).…”

Section: Upscaling Of Elastic Propertiesmentioning

confidence: 63%

“…However, there is still uncertainty related to the elastic properties of the solid clay that should be adopted for homogenization schemes. Recently, Abedi, Slim, and Ulm (2016) and Dubey et al (2019) have back analyzed the TI elastic constants on various shales and found much higher stiffness values, closer to those obtained for individual clay particles (Wang et al, 2001).…”

Section: Level 0 (Solid Clay)mentioning

confidence: 63%

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Effect of Diagenesis on Geomechanical Properties of Organic‐Rich Calcareous Shale: A Multiscale Investigation

et al. 2021

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“…Constructing an appropriate upscaling model, which identifies and captures the governing mechanical processes, is therefore a significant challenge. Recent efforts have begun to account for the inherent variability of the shale response by propagating uncertainty through a multiscale homogenization model using a probabilistic approach (Dubey et al., 2019).…”

Section: Introductionmentioning

confidence: 99%

Nanoindentation of Horn River Basin Shales: The Micromechanical Contrast Between Overburden and Reservoir Formations

et al. 2023

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We present a micromechanical characterization of shales from the Horn River Basin, NW Canada. The shales have contrasting mineralogy and microstructures and play different geomechanical roles in the field: the sample set covers an unconventional gas reservoir and the overburden unit that serves as the upper fracture barrier. Composition and texture were characterized using X‐ray diffraction, mercury injection porosimetry, and scanning electron microscopy (SEM). Grid nanoindentation testing was used to obtain the mechanical response of the dominant phases in the shale microstructure. Samples were indented parallel and perpendicular to the bedding plane to assess mechanical anisotropy. Chemical analysis of the grids with SEM‐EDS (energy dispersive X‐ray spectroscopy) was undertaken and the coupled chemo‐mechanical data was used in a statistical clustering procedure (Gaussian mixture model) to reveal the mechanical properties of each phase. The results show that the overburden consists of a soft clay matrix with highly anisotropic elastic stiffness, and stiffer but effectively isotropic inclusions of quartz and feldspar; the significant anisotropy of the overburden has been previously observed on a much larger scale using microseismic data. Creep displacement is concentrated in the clay matrix, which is the key phase for fracture barrier and seal applications. The reservoir units are harder and have more isotropic mechanical responses, primarily due to their lower clay content. Despite varied compositions and microstructures, the major phases of these shales (clay/organic matrix, quartz/feldspar, dolomite, and calcite) have unique mechanical signatures, which will aid identification in future micromechanical characterizations and facilitate their use in upscaling schemes.

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Multiscale Poromechanical Modeling of Shales Incorporating Microcracks

Cited by 8 publications

References 60 publications

Micromechanical characterisation of overburden shales in the Horn River Basin through nanoindentation

Micromechanical characterisation of overburden shales in the Horn River Basin through nanoindentation

Effect of Diagenesis on Geomechanical Properties of Organic‐Rich Calcareous Shale: A Multiscale Investigation

Nanoindentation of Horn River Basin Shales: The Micromechanical Contrast Between Overburden and Reservoir Formations

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