Jacala-1 exploration well spudded

March 25, 2006
Drilling began March 23 on the Jacala-1 well, located in the center of permit WA-351-P, in the deepwater Carnarvon basin.

Offshore staff

(Asia-Pacific) - Drilling began March 23 on the Jacala-1 well, located in the center of permit WA-351-P in the deepwater Carnarvon basin.

Jacala-1 is located on the Exmouth sub-basin approximately 200 km west of Barrow Island and 100 km NW of the Laverda, Vincent, and Enfield field complex.

In approximately 1,060 m of water, it is targeting a large four-way dip structure and is expected to take approximately 18 days to drill and log.

The reservoir is interpreted to be in Barrow Sandstones at a depth of 2,106 m.

WA-351-P joint venture participants are: Tap (Shelfal) Pty Ltd., 25%; BHP Billiton Petroleum (North West Shelf) Pty Ltd (operator), 55%; and Roc Oil (WA) Pty Ltd., 20%.

03/25/06