讲座时间：2022年12月1号（星期四） 8:30-9:30（北京时间）
Teams会议链接：https://teams.live.com/meet/9552357403017
演讲主题：X-ray microtomographic study on displacement processes and instabilities of the interface associated with CCS
Various phenomena of multiphase flow in porous media related to carbon dioxide capture and storage (CCS) will be presented. In particular, phenomena observed using laboratory-scale X-ray computed tomography (CT) are outlined. When CO2 is injected into a porous rock saturated with water, viscous ratio-related interfacial instability, viscous fingering, and capillary fingering, capillary pressure-related instability occur. These instabilities and their behavior in the transition region are introduced. Since CO2 is lighter than water under reservoir temperature and pressure conditions, there is concern about leakage associated with buoyancy. Therefore, the elucidation of CO2 trapping mechanisms is an important issue in explaining the security of the CCS. The first trapping mechanism is physical trapping by caprock. Second, capillary trapping act on CO2 that has been fragmented into bubbles. Because CO2-saturated groundwater is heavier than CO2-free water, natural convection occurs inside the reservoir. This natural convection promotes the transport of CO2 into the dissolution trapping. The conventional mass transport models phenomenologically describe the dissolution mass transfer of CO2 into groundwater because of a need for more information on the surface area and the mass transport coefficient. X-ray microtomography allows us to independently model the specific interfacial area and the local mass transfer coefficient. Dissolved fingerings, which were theoretically predicted, were observed, indicating that they affect mass transport. Finally, CO2 is fixed as carbonate rock through mineral chemistry.
Prof. Tetsuya Suekane
Tokyo Institute of Technology
Tetsuya Suekane is a professor at the School of Energy Science and Engineering at the Tokyo Institute of Technology. His research interests over the past 10 years include the transport and retention of CO2 in porous media. He has been working on the study of multiphase flows in porous media using microtomographic imaging schemes such as X-ray CT and MRI. He has recently started the development of a combined CCS and microalgae CO2 fixation system. Current research includes global warming mitigation, energy efficiency, CCS, CO2 capture and storage, enhanced oil recovery, renewable energy, clean coal technologies, and more. He has published more than 150 academic papers, which have been cited more than 1000 times.
