Description
The computed tomography (CT) facilities at the National Energy Technology Laboratory (NETL) Morgantown, West Virginia site were used to characterize core of the Tuscarora Sandstone from a vertical well in Preston County WV, the Preston-119 from a depth of 7,165 to 7,438 ft. The primary impetus of this work is a collaboration between West Virginia Geological and Economic Survey (WVGES) and NETL to characterize core from multiple wells to better understand the geologic framework of key stratigraphic units in West Virginia. As part of this effort, bulk scans of core were obtained from the Pres-119 well, provided by the WVGES. This report, and the associated scans generated, provide detailed datasets not typically available for researchers to analyze.
This dataset contains CT scan images collected from the cores obtained from Clay 513, Harrison 79, and Preston 119 wells. Additional processing of the CT scan data from Preston 119 well is performed to semi-quantitatively assess fracture volume. These results are summarized in figures, and spreadsheets.
Software Requirement Note:
Free software may be required to view some of the information provided. Software used for data analysis include ilastik, FIJI and ImageJ2.
Resources
| Name | Format | Description | Link |
|---|---|---|---|
| Computed Tomography CT-scanned data Analysis for the Tuscarora Sandstone.docx | Doc | The purpose of this document is to describe the contents of information contained within a submission to the Geothermal Data Repository (GDR) in support of Feasibility of Deep Direct-Use Geothermal on the West Virginia University Campus-Morgantown, WV. Software Requirement Note: Free software may be required to view some of the information provided. Software used for data analysis include ilastik, FIJI and ImageJ2. | Open resource |
| CT Summary.docx | Doc | Contains explanation of the parameters used in CT data collection and how segmentation was used to produce volume percentages. | Open resource |
| Clay 513 CT Scans.zip | ZIP | Contains image files for Medical CT scans of the Clay 513 well. These images are a reslice through the center of the core and represent a 2D image of the core. Color variations are a proxy for density differences in the core. Each image represents a scan from one core box, ~ 3 feet in length. | Open resource |
| Harrison 79 CT Scans.zip | ZIP | Contains an image file for a Medical CT scan of the Harrison 79 well. This image is a reslice through the center of the core and represent a 2D image of the core. Color variations are a proxy for density differences. The image represents a scan from one core box, ~ 3 feet in length. | Open resource |
| Exported Segmented Files Full.zip | ZIP | Contains the files produced after segmentation in ilastik. They can be viewed in several image processing programs including ImageJ2 or FIJI. After importing the segmented tiff stack for a core section into one of the image processing programs you can view the volumes and calculate the percentages by following the instructions in the '% volume by CT calc' powerpoint. The background (air/outside) is subtracted and the percent volume of fractures can be determined for the entire sample. These segmentations and associated calculations were performed on entire scans (2 to 3 foot sections of core, one length of core box); these can be refined if a small subset is chosen. With a smaller subset, additional artifacts can be removed such as beam hardening and edge effects. | Open resource |
| ilastik Segmented Files.zip | ZIP | Contains files produced using the interactive learning and segmentation toolkit ilastik. The premise of isolating features is to first segment out the feature based on its unique grayscale value. Once this isolation has occurred, the next steps are to differentiate multiple isolated features and then combine them into one coherent visual representation. | Open resource |
| Computed Tomography of the Tuscarora Sandstone from the Preston 119 Well.pdf | Contains technical report produced by NETL on the CT scanning of the Preston 119 core. | Open resource | |
| Percentage volume by CT calc.pptx | Powerpoint | Contains explanation of how volume percentages were calculated in FIJI/imageJ2 after segmentation. | Open resource |
| Preston 119 CT scan fracture estimation.xlsx | XLS | Contains early version of fracture volume percentage of the Preston 119 well after filtering to remove edge effects. The data is listed by tiff stack which represents 1 core box or approximately 3 feet of core | Open resource |
| Tiff stacks.zip | ZIP | The folder contains the original stacks collected for Preston 119 core from the medical scanner in a .h5 format which is easier to use in ilastik. The grayscale values in the Tiff stacks were used to isolate and visually differentiate objects of interest in the scans (in this case: matrix, fractures and air/outside). The 'Exported segmented files' are the files produced after segmentation in ilastik. They can be viewed in several image processing programs including ImageJ or FIJI. After importing the segmented tiff stack for a core section into one of the image processing programs you can view the volumes and calculate the percentages by following the instructions in the '% volume by CT calc' powerpoint. | Open resource |
| Tusc fracture volumes by CT v3 all boxes.xlsx | XLS | Contains fracture volume percentage of the Preston 119 well after filtering to remove edge effects. The data is listed by tiff stack which represents 1 core box or approximately 3 feet of core. | Open resource |