Australia: Tap Oil Evacuates Crew from Zola-1 Location Ahead of Cyclone Bianca
Tap Oil Limited provides the following update on the Zola-1 exploration well, offshore Carnarvon Basin, Western Australia.
Location / Proposed Depth
The Zola-1 well is located in permit WA-290-P, immediately south of the giant Gorgon gas field in the Carnarvon Basin, Western Australia. The well is being drilled in 285 metres of water and the primary Mungaroo Formation target will be intersected at approximately 4,300 metres below sea level. Further secondary targets will see the well drilled to a target depth of 5,000 metres.
During the period from 06:00 hours WST on 19 January 2011 to 06:00 hours WST on 27 January 2011, Zola-1 drilled from 3,839 metres to 4,008 metres. Drilling has been temporarily suspended and this morning the rig has been secured and crew evacuated ahead of Cyclone Bianca.
When the crew return to the rig, drill to the total depth of the 311mm (121/4”) hole section (approximately 4,050 metres) where the final string of 244mm (95/8”) intermediate casing will be run. The well will then be drilled in 216mm (81/2”) hole to the first target in the Mungaroo Formation.
Upon completion of evaluation the well will be plugged and abandoned in the normal course of offshore operations.
The Zola prospect is a very large Triassic tilted fault block on trend with the giant Gorgon gas field. One of the largest undrilled structural features in the Carnarvon Basin, Zola is covered by high quality newly reprocessed 3D seismic data and is considered a moderate risk prospect. Zola is estimated by Tap to contain mean recoverable gas volumes of 1.0 trillion cubic feet with upside potential for 2.0 trillion cubic feet. The well will test the gas potential of several top and intra Mungaroo Formation sands – the primary reservoir at Gorgon. In addition it is possible that some Jurassic reservoirs may be developed flanking the main Triassic structure.
Previous drilling in WA-290-P focused on the shallower Jurassic and Cretaceous interval, resulting in the Antiope gas discovery in 2000 and the minor Lauda oil discovery in 2005.
Located close to existing and developing gas infrastructure, Zola would have multiple potential development options should it be a discovery. Any development at Zola could also encompass the overlying Antiope gas discovery (estimated at ~120 Bcf).
WA-290-P Joint Venture Participants
Tap (Shelfal) Pty Ltd 10.00%
Apache Northwest Pty Ltd (Operator) 30.25%
Nippon Oil Exploration (Dampier) Pty Ltd 15.00%
OMV Australia Pty Ltd 20.00%
Santos Offshore Pty Ltd 24.75%
Source:Tap Oil , January 27, 2011; Image1:BoM