Shell will sell its interest in six Gulf of Mexico oil and gas fields to W&T Energy VI, a W&T Offshore subsidiary, for $450m.

The assets include Tahoe, Southeast Tahoe, Droshky, Marlin, Dorado and a Gulf of Mexico-producing shelf property, which are all predominately mature gas fields.

The fields produce 18,000 barrels of oil equivalent per day and have proved reserves of 27 million barrels of oil equivalent.

The sale is part of Shell’s portfolio restructuring programme and will enable it to focus on capital efficiency.

Marvin Odum, Shell’s director Upstream Americas, said that the deal is part of the company’s plan to divest $8bn of assets worldwide during 2010 / 11.