BG Group chief executive Helge Lund has welcomed with "mixed emotions" Royal Dutch Shell's £47 billion takeover bid, which came only two months after he took office.

Speaking at BG's annual general meeting in Reading the former Statoil boss said there is still much to do before the transaction can complete but that Shell's bid, at a 50 per cent premium to BG's share price on April 7, maximises BG's value while removing potential risks.

"This is a strong deal for our shareholders," he said.

"That said, you will understand that, from a leadership perspective, I do have slightly mixed emotions as I was looking forward to taking BG forward and a takeover was certainly not in my mind when I joined the company."

Mr Lund took office on February 9 with a mandate to turn BG around after a string of profit warnings and delays on major projects.

Completion of the agreed takeover will trigger payouts for Mr Lund that could see his first year's pay top £32 million.

Mr Lund's initial pay package had been a subject of much debate after his recruitment from Statoil, prompting the company to reduce it by millions of pounds, and about 18 per cent of BG shareholders rejected his remuneration terms at Tuesday's AGM.

Shell's takeover offer, first raised in a mid-March phone call between Shell chief executive Ben van Beurden and BG chairman Andrew Gould, was announced on April 7.