We are lucky living in Australia because oil and chemical spills from ships are quite rare events. This is because of several things:
We are also lucky in Australia because there is a very good emergency service operated jointly between various government and industry organisations called Australia's National Plan to Combat Pollution of the Sea by Oil and other Noxious and Hazardous Substances. The National Plan is administered by the Australian Maritime Safety Authority (AMSA).
If you would like to find out how the National Plan works go to http://www.amsa.gov.au/Marine_Environment_
If you would like information about some of the larger or more complex oil spills that have happened in Australia go to http://www.amsa.gov.au/Marine_