The PFG, a force made up of local groups around Libya tasked with protecting oil facilities, closed down the ports in what it said was a dispute over pay.
An oil engineer at Ras Lanuf said normal work had resumed.
Apart from E&P activities, the successful companies will also spend over USD 1.3 million in social welfare for the areas of their respective Blocks.
Meanwhile, for blocks that have made discoveries, investments of several hundred million dollars will be made by these companies to develop the production.