Imaging a Sealed Shale Sample Using Industrial Computed Tomography Scanning

ABSTRACT: Shale is typically a heterogeneous geomaterial that can undergo rapid transformation once exposed to the atmosphere. Various methods have been used to minimize the effects of this transformation on the physical and mechanical properties. For this study, 61.1 mm (HQ3) diameter shale core samples were investigated. Immediately following core retrieval these cores were coated in canola oil and sealed in plastic wrap. The samples were then suspended in a PVC pipe and filled with wax. The end caps were also PVC and partially filled with wax to ensure the ends of the samples were confined. These tubes were used to maintain the integrity of the samples during storage and transportation. Non-destructive high-resolution X-ray Computed Tomography (CT) scanning was used to investigate the mesostructure of the shale cores while within the PVC container. The 3D composition of the core was imaged by industrial CT scanning. Images resolve the distribution of burrow features (trace fossils) and fissures throughout the core. We conclude that this study provides evidence for the value of non-destructive methods prior to removing sample containers.