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Keywords: Imaging
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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2066
... imaging illustrates a complex network of connected micropores and microfractures. Deformation has also been mapped consequent to Brazil shear stress tests to illustrate the correlation between mechanical response and mineralogy, crack densities, crack morphology and distribution. This X-ray μCT mapping...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1199
... ABSTRACT: We imaged confining-pressure induced changes in dry, unconsolidated quartz sand with micro X-ray computed tomography (CT) while simultaneously recording ultrasonic P-wave velocities. Increasing confining pressure (atmospheric pressure to 27.6 MPa) leads to 30% reduction in porosity...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1320
... ABSTRACT: This paper represents an effort to outline some issues and potential guidelines associated with the integration of rock images with laboratory data. It is entirely based on the use of X-ray computed tomography (CT) imaging, which has become more readily accessible over the years...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-1004
... to the plug axis. The mechanical data are augmented with X-ray CT image volumes acquired pre-test and post-test in order to elucidate some of the observations as well as to outline possible elements of a laboratory workflow that would comprise image-based heterogeneity assessment and prediction. We emphasize...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0890
... to highlight the compressional wave variations in the rock. Although tough there are areas within the sill pillar that are prone to smearing, we are able to resolve subtle variations in velocity structure. By considering different time periods, we image temporal changes in seismic velocity that we relate...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0311
... ABSTRACT: Characterizing the heterogeneous structure of shale rocks plays a critical role in understanding their gas storage, fluid transport, and geomechanical properties. In this study, multiple imaging scales are used to better view features involved in the geomechanical properties...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0462
... method is described for the visual detection and model reconstruction of underwater topography and rock mass surface by using B-mode ultrasonic imaging device. It automatically detects the imaging lines of topography and rock mass surface in the obtained ultrasonic images. These imaging lines are used...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0468
... to be accounted for in borehole stability models involving smectite-rich material. 1. INTRODUCTION reservoir geomechanics strength Reservoir Characterization Upstream Oil & Gas wellbore integrity Imaging evaluation reconstruction stress sensitivity workflow Parallel Oligocene shale...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-803
... as a precursor of progressive shear failure along rock discontinuities (Hedayat et al 2014). hydraulic fracturing shear active ultrasonic imaging configuration navier equation specimen specific stiffness Upstream Oil & Gas discontinuity interfacial characterization Reservoir Characterization...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-879
... Abstract: During the initial phase of this SubTER project, we conducted a series of high resolution seismic imaging campaigns designed to characterize induced fractures. Fractures were emplaced using a novel explosive source that limits damage to the borehole. This work provided evidence...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7473
... Abstract The deformation of synthetic halite is investigated at the scale of its polycrystalline microstructure. Images recorded during compression test performed in the chamber of a scanning electron microscope on centimeter sized samples are analyzed by Digital Image Correlation techniques...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7041
.... This volumetric deformation was then compared to micron scale CT scan data for the same region. The fracturing pattern and the geometrical properties of fracturing (e.g., volume, fracture width, etc.) can be measured and analyzed from the 3D CT images. The resolution of the micro-CT images is sufficient...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-162
... Abstract: In this paper we present 2-D and 3-D image-based methods to detect fractures in drill core. With the first approach, fractures are detected from a profile along the central axis of a core sample. Fracture detection strategies include taking the difference between the core profile...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-366
... Abstract: How a mud becomes rock and what controls its physical properties is encoded in the fine scale microscopic details of its constituents. These details are analyzed via high resolution SEM imaging over multiple length scales of shale components (fecal pellets, silt streaks, etc...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-465
... ABSTRACT: High resolution neutron (~13.7 µm/voxel) and X-ray (~11.2 µm/voxel) tomography imaging of partially water saturated sand specimens was performed at Helmholtz Zentrum Berlin (HZB). Two different sand grain morphologies (round and angular) were used. Partially saturated silica sand...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-298
... was applied at the rock surface through openings in the TBM shield. Seismic S-waves were measured by an array of accelerometers coupled to the tunnel walls within 20 m behind the sources. Later, the TRT images were compared to the TBM data, the rock types, and the water discharge locations. Approximately 90...
Proceedings Papers

Paper presented at the 44th U.S. Rock Mechanics Symposium and 5th U.S.-Canada Rock Mechanics Symposium, June 27–30, 2010
Paper Number: ARMA-10-274
... that can cause adverse source and path effects acting to reduce signal-to-noise ratios of the recorded data. Enhanced Microseismic Imaging provides increased resolution, greater processing efficiency and meaningful interpretations of the induced fracture network by using more efficient algorithms...
Proceedings Papers

Paper presented at the 44th U.S. Rock Mechanics Symposium and 5th U.S.-Canada Rock Mechanics Symposium, June 27–30, 2010
Paper Number: ARMA-10-272
... of hydrocarbons in place is quantified from multiple high-resolution 3D non-scale images of shale fragments. The same images can be used to compute porosity and the directional gas or oil permeability of shale. Finally, the brittleness of shale is likely to be related to its mineralogy, specifically the amounts...
Proceedings Papers

Paper presented at the 44th U.S. Rock Mechanics Symposium and 5th U.S.-Canada Rock Mechanics Symposium, June 27–30, 2010
Paper Number: ARMA-10-376
... ABSTRACT: Traditional medical X-ray imaging, CT scanning, and cross-specimen acoustic tomography (CSAT) were used to visualize the internal structure of macroporous plaster specimens and calculate the total volume of the macropores. The traditional medical imaging and CT scanning produced...
Proceedings Papers

Paper presented at the The 42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008
Paper Number: ARMA-08-123
... seismic tomography (XHST) was evaluated through a void imaging demonstration at the Colorado School of Mines Edgar Mine experimental facility. Construction of an isolating bulkhead permitted imaging comparisons between air-filled and water-filled void conditions. Despite rather small errors in void...

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