There should be a Combine Geometry parameter in the transformer. Have you got that set to Result Geometry Only?
If this is set then I believe the geometry comes out with the query, without having to specify the column name, like here:
A couple of other thoughts - maybe too obvious - but you are using the Oracle Spatial Object reader (not Oracle Non-Spatial)? And are you getting any results at all? Like is it returning attributes from Oracle but no geometry? It could be that there are no results being matched. Perhaps there are parameters for the Oracle format that need setting?
Also, are there any warnings in the log file? That could spell out what the problem is. As a last resort, run it again with Tools > FME Options > Translation > Log Debug set. That might return some extra messages to help with debugging (just don't leave it on all the time because it will return messages that could be misconstrued outside of debugging).