Decent opportunities for civil engineering graduates in oil & gas, most of which are going to be structural related. This can broadly be broken down into topsides (surface production facilities, i.e. the oil platforms themselves) and subsea (various subsea structures that are utilised in subsea facilities that transport the hydrocarbons from the well to the oil platform).
Then there's pipelines and risers (vertical pipelines that transport hydrocarbons from the seabed to the oil platform), which is quite similar in many ways to structural. Although for these positions you're also competing with mechanical graduates.
You can also go into drilling and wells, as many oil companies and drilling/well services companies like Schlumberger and Halliburton accept graduates of any engineering discipline.
In fact there's probably more opportunities for you with a civil degree than a chemical one, to be honest, although they might not be as obvious. Or maybe civil engineering graduates don't look for them. If you look at the BP graduate site, for example, it clearly states there is a programme for civil engineers, as well as positions in subsea and pipelines.