OPEC meets in Vienna today on the verge of an oil production cut. The group still lacks an agreement on crucial details that could convince traders that they are serious about preventing oversupply next year and boosting prices. A day of talks in the Austrian capital on Wednesday concluded with a panel led by Saudi Arabia and Russia -- the group’s most powerful members -- recommending an output reduction lasting six months, according to Oman’s Oil Minister Mohammed Al Rumhy. But they didn’t discuss how big any cuts should be, he said. The group could eventually agree to remove about 1mn barrels a day, about 1% of global output, from the market, Al Rumhy said.