On the structural anisotropy of physical and mechanical properties of a Bunter Sandstone

Menezes, Flora Feitosa; Lempp, Christof

doi:10.1016/j.jsg.2018.06.010

Cited by 14 publications

(5 citation statements)

References 22 publications

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“…Moreover, a granulated material such as silica sand allows control of certain statistical structural properties including grain geometry, grain size distribution and porosity, which ultimately results in a significant reduction of specimen-to-specimen heterogeneity and, conversely, exact control over the explicit inclusion of heterogeneities within any 3D printed sandstone specimen (Primkulov et al 2017). In contrast with natural materials, which are indeed heterogeneous and anisotropic (Marinos and Hoek 2001;Bewick et al 2009;Menezes and Lempp 2018), 3D printed sandstone analogues enable the possibility of testing specimens with virtually equivalent matrix structures and in the presence of discontinuities and orientation.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Mechanical Behavior and Permeability of 3D Printed Sandstone Analogues Under Triaxial Conditions

Gomez

Chalaturnyk

2018

Transp Porous Med

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Consolidated drained triaxial tests arise as one of the most exhaustive methods to quantify the strength, volumetric behavior and failure process of rocks. Understanding the compressibility of a rock matrix and the permeability evolution induced by the effects of confining stress is essential to achieve a better understanding of the productive behavior and performance of enhanced hydrocarbon recovery methods in natural reservoirs. This study investigates the suitability of using of reservoir sandstone analogues, 3D printed with silica sand, to analyze the behavior of natural rocks. A comprehensive mechanical and hydraulic characterization of 3D printed silica sand is addressed by subjecting the sandstone analogues to various levels of confining stress and measuring their cumulative volumetric deformation and permeability evolution at each compression stage. Experimental results demonstrate that 3D printing technology can reproduce porous media that resembles the mechanical behavior of natural reservoir rocks. Nonetheless, some divergences are encountered with the properties of 3D printed analogues when compared to natural reservoir rocks. The 3D printed sandstone analogues were found to be more compressible and permeable than widely studied reservoirs such as Berea Sandstone. Efforts are made to optimize the 3D printing process of the rock analogues to overcome the differences encountered in the mechanical and hydraulic behavior.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Mechanical Behavior and Permeability of 3D Printed Sandstone Analogues Under Triaxial Conditions

Gomez

Chalaturnyk

2018

Transp Porous Med

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“…The strength of a rock derived from a uniaxial compression test (e.g., [44]) 70 to 134 [45] Average ≈ 200 (range 41-209) [46] 2.33 to 151.6 [47] MPa…”

Section: Uniaxial Compressive Strengthmentioning

confidence: 99%

“…The shear strength of a material when the stress normal to a shear surface is zero (e.g., [48,49]). Controls where the failure envelope intersects the zero normal stress axis of the Mohr diagram, and the magnitudes of the effective differential stresses needed to create shear fractures 12 [45] 49 to 51 [41] 64 normal to cleavage, 11 when σ 1 30 • to cleavage [42] MPa…”

Section: Cohesionmentioning

confidence: 99%

Use of Mohr Diagrams to Predict Fracturing in a Potential Geothermal Reservoir

2021

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Inferences have to be made about likely structures and their effects on fluid flow in a geothermal reservoir at the pre-drilling stage. Simple mechanical modelling, using reasonable ranges of values for rock properties, stresses and fluid pressures, is used here to predict the range of possible structures that are likely to exist in the sub-surface and that may be generated during stimulation of a potential geothermal reservoir. In particular, Mohr diagrams are used to show under what fluid pressures and stresses different types and orientations of fractures are likely to be reactivated or generated. The approach enables the effects of parameters to be modelled individually, and for the types and orientations of fractures to be considered. This modelling is useful for helping geoscientists consider, model, and predict the ranges of mechanical properties of rock, stresses, fluid pressures, and the resultant fractures that are likely to occur in the sub-surface. Here, the modelling is applied to folded and thrusted greywackes and slates, which are planned to be developed as an Enhanced Geothermal System beneath Göttingen.

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“…Mechanical anisotropy is a key factor that controls the formation of deformation structures. Menezes and Lempp (2018) carry out triaxial compression tests to understand how anisotropy influences the mechanical behaviour and variations of physical properties of Bunter sandstones. They quantify fracture patterns and collect measurements of permeability, compressive strength, Young's modulus, mechanical work during the pre-failure stage and ultrasonic velocities on a series of water-saturated samples.…”

Section: Contents Of This Volumementioning

confidence: 99%

From hot to cold - The temperature dependence on rock deformation processes: An introduction

Gomez‐Rivas

Butler

Healy

et al. 2020

Journal of Structural Geology

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On the structural anisotropy of physical and mechanical properties of a Bunter Sandstone

Cited by 14 publications

References 22 publications

Experimental Investigation of the Mechanical Behavior and Permeability of 3D Printed Sandstone Analogues Under Triaxial Conditions

Experimental Investigation of the Mechanical Behavior and Permeability of 3D Printed Sandstone Analogues Under Triaxial Conditions

Use of Mohr Diagrams to Predict Fracturing in a Potential Geothermal Reservoir

From hot to cold - The temperature dependence on rock deformation processes: An introduction

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