Retraction: Laboratory research of wettability and heterogeneity effect on microscopic residual oil distribution in tight sandstone cores during CO2 flooding (IOP Conf. Ser.: Earth Environ. Sci. 208 012065)

This article has been retracted by IOP Publishing in light of clear evidence that some content in this article have been taken from another source (Xiao P 2018 'Laboratory study heterogeneity impact on microscopic residual oil distribution in tight sandstone cores during CO2 immiscible flooding', https://www.tandfonline.com/doi/full/10.1080/15567036.2019.1582732) without permission or reference. In line with the Committee for Publication Ethics (COPE) this has been investigated in accordance with COPE guidelines and it was agreed the article should be retracted.