Oil major BP said it has completed aerial a total of 28 surveillance flights over the North Sea since production was shut down on the Clair platform after a technical issue.
The company has been using the method of surveillance data, combined with satellite imagery to collect information about the impact of the oil spill on Sunday, October 2nd.
In a statement BP said indications show rapid and significant natural evaporation and dispersion.
BP has also collected water samples in the area which are being analysed.
A spokesman said: “BP continues to work closely with the Department for Business, Energy and Industrial Strategy (BEIS) towards restarting production from Clair. No date for the restart has been confirmed.”