Perth Basin

The Perth Basin extends south from the Southern Carnarvon Basin and covers an area of about 100,000 km2, from the Yilgarn Craton in the east to the edge of the continental shelf in the west. The onshore area is readily accessible, consisting of farming and shrub land in the central region. The undulating northern portion of the basin has relatively simple access from main roads. In the south, forestry and grazing are the main land uses.

The basin is close to petroleum industry infrastructure, including two major gas pipelines and trucking facilities that service an oil refinery 30 km south of Perth. The Parmelia Gas Pipeline provides ready access to market and allows economic exploitation of small discoveries.

The stratigraphy and petroleum system elements of the Perth Basin developed during the tectonic evolution of the basin and vary significantly from north to south. Initial rifting established a series of Permian to Early Triassic depocentres for fluvial and marine siliciclastics with minor carbonates and coals in the north, while in the south fluvial siliciclastics and coals dominated. These Permian- and Early Triassic-age rift-sag deposits are associated with the major petroleum system in the north Perth Basin, particularly the Kockatea Shale which forms an important oil source rock and regional seal to underlying reservoirs.

A second phase of rifting in the Late Triassic and Early Jurassic was associated with widespread fluvial and deltaic deposits, including a thick succession of siliciclastics and coals (Cattamarra Coal Measures), which are overlain by Middle Jurassic marine shales (Cadda Formation) in the north Perth Basin. These Early to Middle Jurassic strata form a second proven petroleum system in the north Perth Basin. The final rift and breakup phase in the Middle Jurassic to Early Cretaceous was associated with deposition of fluvial and marine siliciclastics (Yarragadee Formation, Parmelia Group and Warnbro Group), which form the main petroleum system in the Vlaming Sub-basin.

Perth Basin

Cervantes Prospect, Onshore Western Australia

Summary

A farm-in agreement for the Cervantes Joint Venture was executed on 17 January 2020 between Vintage, Metgasco Ltd and RCMA Australia Pty Ltd (“Jade”), with Jade to be free carried through the drilling of Cervantes-1 oil exploration well.  The Joint Venture is targeting to spud the well in 2020 and has an option to drill a second well into a separate prospect.

The Cervantes prospect sits within L14, a 39.8 km2 Perth Basin production licence granted over the Jingemia oilfield and surrounds.  The licence is in good standing and not due to expire until June 2025. To earn 30%, Vintage will pay for 50% of the cost of the well, and $200,000 of evaluation and exploration costs ($100,000 to Metgasco for future exploration expenditure relating to Cervantes and $100,000 to Jade for seismic re-processing over the L14 licence).   

The well is expected to cost $5-7 million (gross), with any well costs above a cap of $8 million (gross) reverting to Vintage’s joint venture equity level of 30%. The expected timing of estimated costs, net to Vintage, are as follows:

  • FY20 – $1.0 million for long lead items to drill the well and evaluation and exploration costs   
  • ​FY21 – Up to $2.5 million to drill first well
  • FY22 – Assuming success, $0.9 million for a three kilometre tie-in to Jingemia processing facility and the option to drill a second well on similar terms as the first well.

The Cervantes structure is located in a gap along the oil discovery trend of the Hovea, Jingemia and Cliff Head oil fields.  These fields, in total, have produced in excess of 27 MMbbl of oil from the key Permian reservoirs in the Perth Basin and lie within an oil fairway around the western and northern section of the basin.  The Cervantes structure is a high-side fault trap of multiple Permian reservoir units and shares strong similarities with these oil fields in terms of structure, potential reservoirs and location within the oil fairway on the western flank of the basin.

Seismic traverse across the Cervantes structure and Kingia Depth Map

The Permian reservoir targets in the Cervantes prospect are the prolific Dongara, Kingia and High Cliff Sandstones. The opportunity for rapid conversion of prospective resources to producing reserves exists via a 3rd party oil processing and operations agreement with L14 operator Jade, which owns 100% of, and operates, the nearby Jingemia oil processing and export facility. 

 
Gross Cervantes structure prospective resource (MMbbl)1
  1U low estimate 2U best estimate 3U high estimate
Dongara 3.7 7.4 14.6
Kingia 2.2 7.1 22.3
High Cliff 0.1 0.8 5.0
Total 6.0 15.3 41.9
Vintage 30% 1.8 4.6 12.6
1 Volumetrics sourced from Metgasco.  The estimate quantities of petroleum that may potentially be recovered by the application of a future development project(s) relate to undiscovered accumulations. These estimates have both an associated risk of discovery and a risk of development. These prospective resources are estimated as of 10 September 2019 and first reported to the ASX on 15 November 2019.  Further exploration, appraisal and evaluation is required to determine the existence of a significant quantity of potentially moveable hydrocarbons. The resources have been classified and estimated in accordance with the Petroleum Resource Management System (PRMS). The prospective resources have been estimated based on the interpretation of 3D seismic integrated with offset well data. Probabilistic methods have been used to estimate the prospective resource in individual reservoirs and the reservoirs have been summed arithmetically. Vintage is not aware of any new data or information that materially affects the estimate above and that all material assumptions and technical parameters continue to apply and have not materially changed.  It is expected that the prospect will be drilled in Q1 FY21 and that no further material exploration activities, including studies, further data acquisition and evaluation work are to be undertaken prior to that activity. Resource estimates are net of shrinkage.

Vintage Energy

Vintage Energy Ltd has been established to acquire, explore and develop energy assets principally within, but not limited to, Australia, to take advantage of a generally favourable energy pricing outlook.

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