Computed Tomography Scanning and Geophysical Measurements of Core from the Coldstream 1MH Well

Crandall, Dustin; Brown, Sarah; Moore, Johnathan; Martin, Keithan; Mackey, Paige; Paronish, Thomas; Carr, Tim; Bowers, C.H.

doi:10.2172/1433839

Cited by 2 publications

(3 citation statements)

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“…The Coldstream 1MH core was scanned by a medical-CT scanner at NETL Morgantown (Toshiba Aquilion TSX-101A/R; Crandall et al, 2018) with a pixel resolution of 430 × 430 × 500 μm. Higher-resolution scans were performed on specific subsections of the core with the NorthStar Imaging Inc. (NSI) M-5000 Industrial-CT system at resolutions of 29.7-70.6 µm 3 .…”

Section: ■ Methodology Ct Methodology and Image Processingmentioning

confidence: 99%

“…A characterization of the full Coldstream 1MH core (Crandall et al, 2018), including whole-rock X-ray fluorescence data, petrophysical data, and a complete archive of CT scans, is available at https://edx.netl.doe.gov /group /core -characterization. The industrial-CT (indCT) scans of specific core sections used in this study are available in the same digital archive.…”

Section: Case Study: Coldstream 1mh Wellmentioning

confidence: 99%

“…The upper surface exposing the en echelon vein array ( Fig. 1A) is beddingparallel but also the top of a new core section (Crandall et al, 2018, their figure 26); therefore, continuity with the preceding core is uncertain. The lower surface ( Fig.…”

Section: ■ Data Lithologymentioning

confidence: 99%

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The transition from planar to en echelon morphology in a single vein in shale: Insights from X-ray computed tomography scanning

et al. 2020

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En echelon fractures and veins are among the most common and distinctive geological structures, yet their three-dimensional forms and relationships to surrounding structures are commonly unclear. X-ray computed tomography (CT) offers an unrivaled ability to examine structures within rocks in three dimensions, and it is applied here to a sample of drill core from the Marcellus Shale of southwestern Pennsylvania (USA). CT images yield qualitative and quantitative data on the transition from a pyrite-rich planar vein to an en echelon veinlet array, and on the heterogeneity of veinlets within the array. Using a combination of three- and two-dimensional images, geometric data, and traditional petrography, we identify a range of veinlet shapes consistent with deformation during formation of an antitaxial graphite-calcite-pyrite vein system. Each of the veinlets is rooted in the underlying planar vein where it is narrowest. The transition from planar vein to en echelon array coincides with a change in bedding, suggesting that competency contrasts between adjacent beds controlled the fracture morphology. Veinlets initiated as short, lenticular fractures at ∼45° to the planar vein before lengthening, dilating, and rotating. None of the veinlets are strongly sigmoidal, nor is there measurable offset across the margins of the planar vein; therefore, finite non-shear strain was very limited, and fluid overpressure–induced fracturing during burial and diagenesis is probably the most likely process for fracturing and vein formation.

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Section: ■ Methodology Ct Methodology and Image Processingmentioning

confidence: 99%

Section: Case Study: Coldstream 1mh Wellmentioning

confidence: 99%

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The transition from planar to en echelon morphology in a single vein in shale: Insights from X-ray computed tomography scanning

et al. 2020

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Experimental Investigation of the Influence of Bedding Planes and Differential Stress on Microcrack Propagation in Shale Using X-Ray CT Scan

Gupta

Mishra

2020

Geotech Geol Eng

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Computed Tomography Scanning and Geophysical Measurements of Core from the Coldstream 1MH Well

Abstract: Photograph of en echelon fracture from Coldstream 1MH well, depth 7,100 ft with an insert of a three-dimensional digital representation of these fractures obtained with NETL's industrial computed tomography scanner.

Cited by 2 publications

References 1 publication

The transition from planar to en echelon morphology in a single vein in shale: Insights from X-ray computed tomography scanning

The transition from planar to en echelon morphology in a single vein in shale: Insights from X-ray computed tomography scanning

Experimental Investigation of the Influence of Bedding Planes and Differential Stress on Microcrack Propagation in Shale Using X-Ray CT Scan

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