TP/15 – Xanadu Oil Discovery

TP/15 Joint Venture

JV Participant Percentage Interest
Norwest Energy (Operator) 25%
Triangle Xanadu Pty Ltd 45%
3C Group IC Limited 30%

 

TP/15 is located in the offshore northern Perth Basin approximately 280km north of Perth, and hosts the Xanadu oil discovery of 2017. The permit occupies the 3 nautical mile wide state territorial waters of Western Australia, adjacent to Port Denison, and covering an area of 645km2.

The Xanadu discovery is located on Beagle Ridge, east of the major Geraldton fault. The oil generation kitchen filling Triangle Energy Limited’s (ASX:TEG) Cliff Head Oil Field is viewed as the same source kitchen for the Xanadu field. Cliff Head and Xanadu also share the same sand packages and reservoirs. 

Background

Xanadu-1 is a conventional oil well located in TP/15, an offshore permit located in state waters, approximately 1.3km from the coastline.  Xanadu-1 was drilled as a deviated well,  from an onshore surface location to an offshore target.  The Xanadu-1 well is situated approximately 40km south of the township of Dongara, Western Australia.

The Xanadu-1 well was spudded on 4th September 2017, and reached a total depth of 2035 mMDRT when it was confirmed that the Xanadu-1 well had intersected hydrocarbon bearing intervals. Norwest confirmed Xanadu a discovery on 25th September 2017.


Results

The reservoir of interest is the top section of the Irwin River Coal Measures (IRCM).  The Dongara Sandstone was not encountered at this well location, with the IRCM found directly below the base of the Kockatea Shale at 854mTVDSS.  Reservoir quality sand intervals were encountered throughout the IRCM with porosities generally ranging from 15% to 16%.

2D Seismic data suggests it may be possible to drill an up-dip location which could allow the higher quality sand units deeper in the section to be penetrated above the inferred oil-water contact.  Erosion of the upper, poorer quality, sands on a structural high similar to observed at the Cliff Head Oil Field would further increase the chance of intersecting the oil column in better quality reservoir.

Excellent reservoir quality was also encountered in the High Cliff and Kingia Sandstone sections, although oil shows were not encountered in this interval.  This does provide future exploration upside, with evidence that oil has passed through this system.  These are the same reservoir units that host the Waitsia Gas Field.


Forward Plan

In February 2018 the TP/15 Joint Venture made the decision to proceed with a 3D seismic survey over Xanadu. Since that time, Norwest has been progressing the application process with the Department of Mines, Industry Regulation and Safety (DMIRS). As soon as the approvals have been granted, the Joint Venture will be able to announce a timeline for the survey acquisition program. 

Survey timing is dependent on numerous factors including humpback whale and lobster migration period, peak commercial fishing times and school holidays, when an increased number of vessels will be in the area. As a requirement for final approval, Norwest is required to work to the advice of DMIRS on the appropriate timing for the survey.

The seismic data is essential to determine both the optimal well surface location and trajectory path for any future wells on the Xanadu structure.  


TP/15 Offshore Perth Basin

Well Details

Permit TP/15
Well Name Xanadu-1
Well Location GDA 94:  29°33?29.117”S114°58?42.074”E
Type of Well Deviated
NWE Working Interest 25%
Geology Interbedded sequence of shale and sand

 

 

 

   

 

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