Transport operators face higher running costs this month after diesel prices jumped on Wednesday.
Coral South, operated by Eni, is the only project in operation, having come on stream in 2022.
Airspace restrictions during the G20 Summit will not disrupt commercial or cargo flights.
Transporters say a lower diesel price eases pressure on operating costs, but there is room for further price cuts.
The decrease in the price of crude oil and a stronger rand drove the significant decline in fuel prices.
