Jadestone is the 100% owner and operator of Stag, a developed oil producing asset, located within the boundaries of the WA-15-L production licence in the Carnarvon Basin, 60 kilometres offshore Western Australia, in a water depth of approximately 47 metres.
The field was developed using a fixed leg, 12-slot manned central processing facility platform with a liquids production capacity of 50,000 bbls/d, of which 30,000 bbls/d is for oil. This is connected, by an eight inch underwater export pipeline, to a pipeline end manifold where shuttle tankers directly load crude oil via a catenary anchor leg mooring buoy.
Hydrocarbons are situated within a combination structural/stratigraphic trapping mechanism of the early Cretaceous M. Australis sandstone reservoirs. Reservoir quality is good with porosities typically in the 18-27% range and permeabilities typically of the order of hundreds of millidarcies.
As at December 31, 2021, Stag had 2P reserves of 12.6 MMbbls (gross and net). Stag field production averaged 2,057 bbls/d during H1 2022.
The Stag field produces heavy sweet crude (18◦ API, 0.14% mass sulphur), which historically sells at a premium to Dated Brent. The premium of the H1 2022 lifting was US$23.72/bbl compared to a weighted average of US$11.09/bbl in H1 2021, reflecting the increase in demand for heavy oil with low sulphur content.
In the second half of 2022, Jadestone drilled two successful infill wells on the Stag field, targeting unswept oil between existing wells. Further infill wells are currently under consideration.
Contact our Australian office
We welcome feedback on any of the documents or activities associated with the Stag asset.
Our contact page has details on how to reach our Australian office.