“cross-boundary petroleum field” means a petroleum field that extends across the boundary between a designated area and a foreign sector of the continental shelf;

“designated area” means an area designated under section 1(7) of the M1Continental Shelf Act 1964;

“foreign sector of the continental shelf” means an area which is outside the territorial waters of any State and within which rights are exercisable by a State other than the United Kingdom with respect to the sea bed and subsoil and their natural resources;

“petroleum field” means a geological structure identified as an oil or gas field by the Order in Council concerned.