Architecture of a sandstone uranium reservoir and the spatial distribution of its internal carbonaceous debris: A case study of the Zhiluo Formation, eastern Ordos Basin, northern China

•Six kinds of architectural elements are identified in the sandstone uranium reservoir.•The subaqueous distributary channel formed in four stages: channel-occurring, channel-flooding, channel-waning, channel-abandonment.•The carbonaceous debris-rich zones overlie the basal surfaces of intrachannel units and barforms.