The results of pioneering carbon dioxide capture and storage（CCS）projects such as Sleipner and Gorgon are widely recognized as milestones in the early days of CCS. The reservoir formations of the pioneering projects are characterized by homogeneous sandstones that develop over several hundred meters thick. On the other hand, sandstone formations expected to work as reservoirs for CCS in Japan are characterized to be more heterogeneous and thinner than those of pioneering projects as above because of the tuffaceous sandstones typical of volcanic arcs. In addition, the geological formations in Japan that separated by complex faults in active continental margins might not be suitable for CCS reservoirs. However, we will have to make CCS feasible against these "challenging" formations. In this paper, examples of multidisciplinary approaches for geological evaluation of domestic depleted oil fields obtained from a joint study with INPEX are shared, and we hope that those findings would help future CCS projects in Japan.
