26 September 2017 Micro-CT in situ study of carbonate rock microstructural evolution for geologic CO2 storage
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Abstract
To achieve the 2°C target made in the 2016 Paris Agreement, it is essential to reduce the emission of CO2 into the atmosphere. Carbon Capture and Storage (CCS) has been given increasing importance over the last decade. One of the suggested methods for CCS is to inject CO2 into geologic settings such as the carbonate reservoirs in the North Sea. The final aim of our project is to find out how to control the evolution of petrophysical parameters during CO2 injection using an optimal combination of flow rate, injection pressure and chemical composition of the influent. The first step to achieve this is to find a suitable condition to create a stable 3D space in carbonate rock by injecting liquid to prepare space for the later CO2 injection. Micro-CT imaging is a non-destructive 3D method that can be used to study the property changes of carbonate rocks during and after CO2 injection. The advance in lab source based micro-CT has made it capable of in situ experiments. We used a commercial bench top micro-CT (Zeiss Versa XRM410) to study the microstructure changes of chalk during liquid injection. Flexible temporal CT resolution is essential in this study because that the time scales of coupled physical and chemical processes can be very different. The results validated the feasibility of using a bench top CT system with a pressure cell to monitor the mesoscale multiphase interactions in chalk.
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Y. Zheng, Y. Zheng, Y. Yang, Y. Yang, M. Rogowska, M. Rogowska, C. Gundlach, C. Gundlach, } "Micro-CT in situ study of carbonate rock microstructural evolution for geologic CO2 storage", Proc. SPIE 10391, Developments in X-Ray Tomography XI, 103910M (26 September 2017); doi: 10.1117/12.2273877; https://doi.org/10.1117/12.2273877
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