Dr. Yi Zheng Profile

Dr. Yi Zheng

at Technical Uni of Denmark

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PROCEEDINGS ARTICLE | September 26, 2017

Micro-CT in situ study of carbonate rock microstructural evolution for geologic CO2 storage

Proc. SPIE. 10391, Developments in X-Ray Tomography XI

KEYWORDS: Carbon dioxide, Carbonates, Electronic test equipment, Imaging systems, Gases, Carbon, 3D image processing, Tomography

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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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