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Keywords: localization
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Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0905
... geologist reservoir geomechanics tensile fracture geology reservoir characterization fracture propagation correlation department macroscopic fracture microseismic monitoring localization engineering photography university acoustic emission wu high-speed photography hydraulic fracturing...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0247
... about porosity evolution is developed through relating to volumetric strain. Further analyses show that the heterogeneous grain breakage leads to the local reduction in porosity, promoting shear band development and changing the microstructural characteristics: P shears dominate microstructure...
Proceedings Papers

Paper presented at the 57th U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2023
Paper Number: ARMA-2023-0690
... compressibility predictions at in situ conditions. In contrast with traditional compaction studies, our analysis focuses on local statistics among regions of a given sample as opposed to global statistics in a sample set. The original workflow includes a segmentation strategy and the definition of a series...
Proceedings Papers

Paper presented at the 57th U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2023
Paper Number: ARMA-2023-0586
... ABSTRACT CO 2 -brine corrodes the shale structure and damages mechanical properties in the Carbon Capture and Sequestration (CCS), potentially leading to the instability of reservoirs. In this study, Brazilian tests are conducted to analyze the tensile strain localization of brine and CO 2...
Proceedings Papers

Paper presented at the 56th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2022
Paper Number: ARMA-2022-0282
...., 2021). Yet, localized thermo-elastic contraction of the surrounding rock can increase fracture permeability and localize fluid flow, causing thermal short-circuiting (Armstead and Tester, 1986; Tsang and Neretnieks, 1998; Guo et al., 2016). Furthermore, fluid flow localization in EGS reservoirs can...
Proceedings Papers

Paper presented at the 56th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2022
Paper Number: ARMA-2022-0706
... associated with induced seismicity. The study of acoustic emission (AE) in the laboratory is commonly used to study how localized events can coalesce into a larger dynamic fracture nucleation. How energy is partitioned into driving the seismicity versus larger aseismic dissipative processes is not fully...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1818
... to investigate the influence of the spatial heterogeneity of the material on the onset and development of localized compaction creep. For this purpose, an elastoplastic constitutive law able to replicate strain localization has been adapted to a rate-dependent formalism, thus enabling the simulation of creep...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2162
... gradient-dependence of internal variables through a penalty method. Local constitutive anisotropy, promulgating the idea of Kunin (IJES, 1981), is enforced as paired strain-space maps. The influence of the anisotropy on the formation of the shear band and the macroscopic responses of the effective media...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1234
.... This embrittlement is theorized to occur due to shear localization within the loaded specimen, resulting in faster microcrack coalescence during the failure process. In this study, we test this hypothesis by conducting true-triaxial experiments on Berea Sandstone with continuous monitoring of acoustic emission...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0569
... ABSTRACT: This paper focuses on the simulation of localized compaction in granular rocks. For this purpose, a continuum framework referred to as Breakage Mechanics is used to capture the role of microscopic crushing on the mechanical response of grain assemblies. In particular, grain size...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-069
... became more and more sophisticated by incorporating methods known from disciplines like seismology, seismics and non-destructive testing. These methods comprise precise arrivaltime detection algorithms [6, 7], different localization approaches allowing for anisotropic velocity fields [8, 9, 10...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7775
... fracture propagation initiated almost simultaneously with breakdown. Analysis also allows us to measure the fluid volume entering the fracture and the fracture volume. Monitoring of Acoustic Emission (AE) hypocenter localizations, indicates the development of created fractured area including...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7152
... Abstract Strain localization in the form of compactive shear bands or compaction bands is often observed in high porosity rocks such as sandstones or limestones. In the present study, we theoretically investigate the possibility of strain localization in a high-porosity carbonate rock...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-473
... of large strain and grain crushing in the samples. Whereas, the dynamic M-modulus increases along with compaction within the sample and is not sensitive to grain crushing observed in our final samples. Reservoir Characterization localization sandstone porous sandstone initial porosity porosity...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-740
.... reservoir geomechanics Upstream Oil & Gas localization Artificial Intelligence subduction slot prediction boundary surface discontinuity machine learning Modeling & Simulation displacement experiment application configuration constitutive model evolution Reservoir Characterization...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-729
... Upstream Oil & Gas Reservoir Characterization anticline pore pressure reservoir sandstone 4 basal strain localization permeability basal surface effective stress evolution shortening deformation crest plastic strain effective plastic strain ARMA 13-729 Predicting the Paleo Evolution...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-393
.... Altered samples indicate early strain localization which was not observed in the intact ones. These early localization events induce more compaction at the macroscopic scale and tend to initiate early fracturing. Reservoir Characterization alteration MPa Upstream Oil & Gas porosity...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-367
... ABSTRACT: Features similar in size, appearance and orientation to previously reported compaction localization features were found in a suite of constant mean stress true triaxial tests. Tests were run at five different stress states ranging from axisymmetric compression to axisymmetric...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-250
... localization evolution Reservoir Characterization Upstream Oil & Gas fracture microcrack mechanical property rock sample reservoir geomechanics Engineering calculation basic element rev reservoir simulation stress-strain curve int deformation microscopic element uniaxial tension matrix...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-268
..., for all types of the loops (such as triangles), there is a universal power law between nodes’ degree and motifs where motifs frequency follow a power law. This shows high energy localization is characterized by fast variation of the loops fraction. Also, this proves that the congestion of loops occurs...

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