The oil stocks and offshore reserves both share vicinity to the sea.

Nor do they have the technology to develop offshore reserves.

American oil companies have been expanding operations there to take advantage of recently discovered offshore reserves.

Nigeria's offshore reserves account for about 25% of its total.

California is a prime candidate: undeveloped offshore reserves probably amount to about 2.5 billion barrels of oil and gas.

Cabinda's petroleum production from its considerable offshore reserves now accounts for more than half of Angola's output.

Our offshore reserves of gas and oil are not unlimited.

Angola's oil production is expected to increase significantly, to 1.2 million barrels a day, in the next three years as new offshore reserves are tapped.

It is a centre for financial services and has offshore reserves of oil and natural gas.

The huge bonus payments that oil companies must pay to secure drilling rights for Angola's offshore reserves have been a particular concern of critics.