G20 expected to produce

The G20 Summit will generate more than $100 million for Brisbane's economy, Queensland's tourism minister says.

World leaders have begun arriving in Brisbane with as many as 4000 delegates and 3000 reporters from around the globe expected to attend the half a billion dollar two-day gathering.

The summit has been criticised as an expensive talkfest but Queensland's Tourism Minister Jann Stuckey says it's a rare opportunity to showcase Brisbane and Queensland to a power international audience.

"The economic benefit is estimated to be around $100 million but I believe it will far exceed that when we look at the long lasting legacy," she told reporters at the G20 international media centre at South Bank on Thursday.

"When you have an international conference you are writing business for years to come."

She said the G20 was also a good training ground for the 2018 Gold Coast Commonwealth Games.

Preparations for the Games were progressing well, including the recent release of a public transport strategy.

"The Commonwealth Games Federaton visited us only recently and gave us a good tick of approval that we are where we need to be," she said.