China Global Television Network said the Shanghai Salvage Bureau would send underwater robots to the location in the East China Sea where the Iranian tanker collided with a freight ship on January 6.
On Tuesday, China's State Oceanic Administration said that it had found an 18-kilometre-long slick east of where the vessel sank, and another slick that was almost 15 kilometres long south-west of the site.
Another slick with a radius of about 5 kilometres was spreading north from the site.
The oil slicks were "much bigger" than on Monday, the administration said, according to the Xinhua news agency, raising concerns of a possible ecological disaster.
The oil spill from a stricken Iranian tanker Sanchi that sank on Sunday is seen in the East China Sea.
China's Ministry of Transport has identified the location of the Iranian oil tanker that sank at the weekend and has caused several devastating oil slicks, state media said on Wednesday.
