The Umuroa, owned by BW Offshore, has been operating from Tamarind Taranaki's Tui Oil field and was 60 kilometres off shore at the time it spilt oil.
In an emailed statement, Maritime New Zealand (MNZ) said a "small amount of oil dispersed naturally" from the ship and there had been no reports of any environmental damage.
The spokesman said oil across 20-30 metres of water could be seen about 400 metres from The Umaroa.
"A helicopter was used to fly over the site at about 6pm Thursday. It found the sheen on the water was dispersing and the area covered getting smaller," the MNZ spokesman said in an emailed statement.
"An aircraft was used to fly offer the site at about 9am Friday. It found no sheen and no oil."
The Taranaki Regional Council said it was notified of the spill by MNZ but had no involvement in the clean up as it was outside its boundary.
Tamarind Taranaki, its administrator Borrelli Walsh and BW Offshore have been approached for comment.
Marine oil spills off the Taranaki coast.
2000: 50 litres of condensate spilled from the Pohokura field, off Motunui, and spread along two kilometres of beach.
2007: about 33 tonnes of oil was spilled from the Tui offshore field resulting in 23 tonnes washing ashore along 14 kilometres of coastline.
2010: oil spilled in the Maari field and washed up on Kapiti coast beaches.
2015: 300 litres leaked from a supply ship near the Maari offshore platform but dispersed naturally.
