The company would control no more than about 6 percent of the world's proven oil reserves.

Proven reserves are also known in the industry as 1P.

The company said proven reserves were worth Ir20p per share.

About 67 percent of its proven reserves are natural gas.

Iraq itself controls some 10 percent of the world's proven oil reserves.

China's proven reserves, and expected resources, fall into four general geographical areas.

Production from Congo is very small but has 80% of proven reserves.

The gulf council nations account for about 50 percent of the world's proven oil reserves.

There are several different estimates of proven oil reserves in Russia.

Price changes therefore can have a large impact on classification of proven reserves.