Same as@david_rmentioned is true for the Oracle Spatial Reader.The geometry (SHAPE) is the feature in FME and will be written to the table column defined in the writer featuretype.
Hi
If you use the SDE reader/writer, the shape column won't show as an attribute, this is normal.The geometry is automatically handled by FME, not as a value but as a proper geometry.If you need to rename the shape column, you can do it in the feature type properties, under the "Format parameters" tab.
David