The damage done by the actual grounding will be minimal. The coral will regrow soon enough. The damage done by the chemicals leaking from the ship and those being sprayed from the air may take a bit longer to become apparent. Corals tend to bleach under stress, this could be caused by many different things, but the oils/other chemicals may be enough to cause a large section to bleach, then die. Then again, we might be lucky, it might all disperse without doing too much harm at all, corals are tougher than many give them credit for.
Dave.