The purchase is subject to government approval, but if granted Petronas will hold an operating stake of almost 69% in the southern Sudan block, which, according to Lundin, has estimated proven and probable reserves of 150 million barrels.

The other Block 5A partners are Austria's OMV (26%) and local company Sudapet (5%).

Sweden's Lundin still holds a 24.5% stake in neighbouring Block 5B, which is operated by Petronas, although civil war has prevented the Malaysians from exploration activities on it.

Block