Positron Emission Tomography (PET) imaging has demonstrated its capability in providing time-lapse fluid flow visualisation for improving the understanding of flow properties of geologic media. To investigate the process of CO geo-sequestration using PET imaging technology, [C]CO is the most optimal and direct radiotracer. However, it has not been extensively used due to the short half-life of Carbon-11 (20.4 minutes). In this work, a novel laboratory protocol is developed to use [C]CO as radiolabelled tracer to visualise and quantify in-situ CO adsorption, spreading, diffusion, and advection flow in coal. This protocol consists of generation and delivering of [C]CO, lab-based PET scanning, subsequent micro-CT scanning, and data processing. The lab-based PET scanning setup integrates in-situ core flooding tests with PET scanning. The real-time PET images are acquired under different storage conditions, including early gas production stage, depleted stage, and late storage stage. These datasets can be used to study across-scale theoretical and experimental study of CO flow behaviour in coal with the application to CO geo-sequestration.
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| http://dx.doi.org/10.1038/s41597-023-02754-3 | DOI Listing |
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