
The tie-up between Shell and BG deal is due to be completed early next year.
However, an institutional investor has told the BBC that the deal does not make "financial sense" at current oil price levels.
David
Cumming, head of equities at Standard Life Investments, told the BBC it
was "very difficult to make the deal work" with oil below $40 a barrel,
saying oil prices needed to be $60-$70 a barrel.