That puts the deal, which will help Shell challenge Exxon Mobil’s position as the world’s biggest international oil company, on track for completion by early next year.
“This is a strategic deal that will make Shell a more-profitable and resilient company in a world where oil and gas prices could remain lower for some time,” said Shell chief executive Ben van Beurden.
Shares in Shell edged up by 2p to 1455.5p, while BG’s were 11.1p, or 1.2%, higher at 937.1p.