Associating x-ray microtomography with permeability contrasts in bioturbated media

Baniak, Greg M. , La Croix, Andrew D. , Polo, Camilo A. , Playter, Tiffany L. , Pemberton, S. George and Gingras, Murray K. (2014) Associating x-ray microtomography with permeability contrasts in bioturbated media. Ichnos, 21 4: 234-250. doi:10.1080/10420940.2014.958224


Author Baniak, Greg M.
La Croix, Andrew D.
Polo, Camilo A.
Playter, Tiffany L.
Pemberton, S. George
Gingras, Murray K.
Title Associating x-ray microtomography with permeability contrasts in bioturbated media
Journal name Ichnos   Check publisher's open access policy
ISSN 1042-0940
1563-5236
Publication date 2014-10-02
Sub-type Article (original research)
DOI 10.1080/10420940.2014.958224
Open Access Status Not yet assessed
Volume 21
Issue 4
Start page 234
End page 250
Total pages 17
Place of publication New York, NY, United States
Publisher Taylor & Francis
Language eng
Abstract The use of X-ray microtomography (micro-CT) to evaluate the contrasts in permeability associated with bioturbation in two- and three-dimensions (2D and 3D) is investigated in this article. Core analysis, spot-permeametry measurements, and petrographic thin-sections of the six different datasets from Western Canada (Debolt Formation, Wabamun Group, and Medicine Hat Member) and offshore Norway (Ula Formation, Lysing Formation, and Nise Formation) show that the trace fossils commonly modify the permeability and porosity of the reservoir through sediment reworking and diagenesis of the sediment. In this study, micro-CT techniques are used to analyze the X-ray attenuation associated with bioturbation in siliciclastics and carbonates. Because X-ray attenuation represents the transmissivity or absorptivity of a sample to the incident X-rays, each of which is related to sediment composition and sediment densities, micro-CT images are integrated with sedimentological data and petrographic data to identify the trace fossils and matrix in 2D and 3D. Due to the difference in sediment grain size and sorting (i.e., porosity) within the burrows and matrix, analysis of the X-ray attenuations allows for their delineation in 2D cross-sectional images. When processed as 3D volumes, the micro-CT images show the complexity in burrow connectivity and burrow orientations within a sample. More importantly, the 3D volumes help show the distribution of porosity that can be linked to measured permeability values within a sample. Quantification of the heterogeneous burrow fabric on reservoir and resource quality is made from these processed micro-CT images.
Keyword Bioturbation
Carbonates
Permeability
Siliciclastics
X-ray microtomography (micro-CT)
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Office of the Vice-Chancellor
 
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Created: Wed, 15 Mar 2017, 13:01:05 EST by Andrew La Croix on behalf of UQ Energy Initiative