Libya 's top oil official said Organization of Petroleum Exporting Countries won't change output quotas when they meet in Vienna this week but stressed that he wants to see crude oil at $100 a barrel by year-end as rising commodity prices erode the group's terms of trade.

"At these current prices OPEC is now losing its terms of trade--the real value of oil is eroding and the prices of food and other commodities are rising, so terms are going against OPEC and this needs to be looked at," Shokri Ghanem, who is also chairman of Libya's National Oil Corp., told Zawya Dow Jones by telephone from Tripoli late Sunday.

New York Mercantile Exchange light, sweet crude oil futures for November delivery were up 19 cents at $82.85 a barrel at 1030 GMT Monday. The contract rose 99 cents to settle at $82.66 on Friday.

Commodity prices, including those of wheat, barley and corn, have surged following poor harvest in
Russia , Ukraine , northern Europe and Canada due to adverse weather. The surge accelerated on Friday, with corn up 13.5% and wheat more than 10% after the U.S. government warned supply was tightening compared to demand.

Jason Schenker, chief economist at Prestige Economics, said although commodity prices have risen at a faster rate than oil this year, the weaker U.S. dollar was having more of an impact on crude prices.

"The downward pressure on the dollar has reduced some of the purchasing power of oil, which is the reason prices have risen over the past month," Schenker said.

Ghanem said some OPEC members are happy with crude in the $70-80 a barrel range but others, including
Libya , are not.

"We will talk about the situation of the terms of trade going against us, this should not be neglected. I want $100 a barrel, we hope this will be by the end of this year," he said. "From the behavior of the market there's no expected major change, some members want higher prices and others are happy with current prices but we will call for more observance of quotas."

OPEC members will meet in
Vienna on Oct. 14 to discuss market developments and decide on whether to take any action.

Apart from
Saudi Arabia and Kuwait , all other OPEC members will be wanting higher oil prices but whether the group can act in a unified way to achieve higher prices remains to be seen, said John Hall, head of John Hall Associates.

"With only one member, Saudi, controlling overall output, OPEC is in a weak position to make a difference unless it adjusts quotas to come more closely in to line with current output levels," Hall said.