The National Oil Company of Iran says the Iranian government should abandon scenarios based on oil selling for $100 a barrel and instead base its budget on a price of $70 per barrel.
International oil prices have been on a steady decline in recent months. Company official Mohsen Ghamsari said OPEC is unlikely to make any effort to reverse the decline.
The plunge to $85 a barrel has caused a significant shortfall in the country's budget. In recent months, oil prices have fallen by $25 a barrel.
The Iranian government based its budget on an oil price of $100 per barrel.
Iranian Vice President Eshagh Jahangiri has referred to the fall in oil prices as "contrived and the result of political manipulation aimed at harming Muslim countries."
Iran is at odds with the Saudi Arabian policy of increasing oil production which it blames for falling oil prices.