The Britpop band announced their comeback this week to much fanfare, 15 years after they broke up when lead guitarist and main songwriter Noel Gallagher said he could no longer work with frontman and brother Liam after a number of public spats.
Mark Sutherland, a music business consultant and journalist, said the audience was likely to be made up of people who had the "best years of their lives soundtracked" by Oasis, and younger fans who know a few hits and want to experience them live.
Oasis opened a pre-sale ballot to those who can answer a question about the band, before tickets go on general release at 9am on Saturday in Britain (6pm AEST) and 8am in Ireland.
Fans have also been advised to be vigilant of scams.
Harry Kind from consumer group Which? said Oasis and ticket sellers had put measures in place to deter people seeking to profit from the clamour for tickets, such as the ballot, which closed on Friday.
Oasis originally announced 14 shows in Cardiff, Manchester, where the group formed in 1991, London, Edinburgh and Dublin, but on Thursday added three dates after "unprecedented demand".
Prices for gigs at London's Wembley Stadium start at Stg74 ($A144), with the most expensive ticket costing Stg506.
Fans are not just trying to get into the shows.
Cheap hotel rooms appear to have been replaced by pricier options on travel sites in cities such as Manchester and some people reported on social media that hotels had sought to cancel bookings they had made before the tour dates being announced in a bid to relist them at a higher price.
The gigs are expected to provide a multimillion-pound boost for Britain's hospitality sector and economy.
Although Oasis said plans were under way to go to other continents, fans were likely to fly in from abroad for the British shows.
"If you want to see Oasis, really the best place to do it is here in the UK where they mean so much," Sutherland said.
with PA
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