In section 1 above—

• " 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 [1964 c. 29.] Continental 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.