NEW YORK - Oil prices rose to a record settlement price Tuesday as traders turned their attention to a government inventory report today that is expected to show tight supplies and shrugged off OPEC's surprise decision to boost output.
    Even factoring in OPEC's decision to increase oil production by 500,000 barrels per day starting Nov. 1, ''supplies are tight,'' said Addison Armstrong, an analyst at TFS Energy Futures LLC.
    And according to analyst predictions, they're going to get even tighter. Analysts surveyed by Dow Jones Newswires, on average, expect today's report from the Energy Department will say that crude oil inventories fell by 2.7 million barrels in the week ended Sept. 7.
     Investors had already priced in OPEC's increase, and many were looking for a larger production boost, analysts said.
    Light, sweet crude for October delivery rose 74 cents to settle at $78.23 a barrel on the New York Mercantile Exchange after alternating frequently between gains and losses. The settlement price bested the previous record, set July 31, by 2 cents.
    In Vienna, Austria, OPEC representatives agreed Tuesday to increase oil production to meet an expected surge in winter consumption and push prices down, even as they expressed concerns that a slowing global economy might dampen future oil demand.
     The surprise decision by members of


the Organization of the Petroleum Exporting Countries came after an unusually long day of arguments among the oil cartel's 12 members over the size and the timing of the increase.
    Some countries, such as Iran and Venezuela, had initially been opposed to increasing supplies, a move backed by Saudi Arabia and other Persian Gulf states.
    The decision to increase OPEC supplies by about 2 percent is the first official rise in more than a year and will be effective Nov. 1.
    OPEC, which produces about 40 percent of the world's oil, had long been expected to hold production levels steady. But rumors started circulating on Monday that Saudi Arabia was campaigning to boost production.
    Many analysts think the Saudis are worried high oil prices will crimp demand for crude, which could hurt OPEC nations in the long run.
    OPEC representatives said they were aware that excessively high prices might put a dent on a world economy that is already suffering from a weak housing market in the United States. Some oil ministers attending the meeting said they did not want to be blamed for worsening the world's economic woes.
    OPEC also recognized the dangers that a slowing global economy posed to its business. Many ministers here feared repeating the mistake made in 1997 when the group boosted supplies just as the Asian financial crisis was brewing. The result was a collapse in oil prices the following year.