Nexen chief executive Marvin Romanow said Appomattox has the potential “to be our best ­discovery in the US Gulf so far”, and that once drilling resumes in the region “we will continue appraisal of the field in order to ­determine ultimate reserves and move towards development plans, which potentially include a new hub”.

However, a Nexen spokesman cautioned that more appraisal work is required “before we can have a full development plan and before details on capacity, cost and timing can be publicised”.

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