The State Oceanic Administration (SOA) said yesterday ConocoPhillips had reported the leakages near a platform in Bohai Bay jointly owned through the American company and China's CNOOC. Further details were not provided.
ConocoPhillips has said a lot more than 2, 100 barrels of oil and oil-based mud, a substance used like a lubricant in undersea drilling, have leaked from two platforms, reportedly polluting beaches and killing marine life in the region.
The US company today confirmed it was "closely monitoring and sampling several small seeps" that have been leaking about two litres of material per day.
"Any oil droplets released in the seep area are contained and cleaned up at the surface, " ConocoPhillips said inside a statement, adding that it has so far cleaned up 369 cubic metre distances (about 13, 000 cubic feet) of oil-based mud.
The SOA, which supervises as well as manages China's seas, said last week it planned to sue ConocoPhillips within the spill, which was first detected in early June.
A Chinese lawyer can also be suing CNOOC and ConocoPhillips over the leaks, state media said last 7 days.
Fishermen in the Shandong, Hebei and Liaoning provinces that border Bohai These types of, east of Beijing, allege that oil from the leaks has killed a sizable part of their harvest of such seafood as scallops.
Environmental groups have also called on ConocoPhillips to handle speedier and more transparent clean up efforts.
Both ConocoPhillips and CNOOC have apologised for that spill, and the US company said last week it hoped to cleanup the oil by the end of August.