The oilfield was discovered in the Lubuskie region next to the existing Rzeczyca field which holds 100,000 metric tons of oil. The entire complex is now estimated to hold 500,000 tons of oil.
After the development of the deposit, the site will produce 16,500 tons of oil annually. Tests at the site indicate a high probability of further oil deposit discoveries, Orlen said in a press release.
"The Rzeczyca field is one of the biggest oil discoveries in Poland in more than a decade," Orlen's CEO, Ireneusz Fafara, said in the statement.
The majority of Orlen's national oil extraction comes from oil deposits in western Poland. Last year the group's output of oil, condensate and natural gas liquids amounted to about 824,000 tons.