Santos introduced the Dorado-2 appraisal nicely has confirmed Dorado as a serious oil and gasoline useful resource within the Bedout Basin, offshore Western Australia.
The nicely was drilled down-dip roughly two kilometres from the Dorado-1 discovery and encountered 85 metres of internet reservoir within the major Caley Formation. As anticipated, an oil-water contact was intersected at four,003 metres measured depth, with 40 metres of internet oil pay encountered. An further 11 metres of pay was encountered within the Upper Caley sands. Preliminary wellsite evaluation signifies this higher zone is oil-bearing, however is topic to additional evaluation to substantiate the hydrocarbon part.
An extra 32 metres of internet pay was encountered within the underlying Baxter and Milne sandstones, with no fluid contacts intersected. Both sands are at present interpreted to be gasoline bearing, though much like the Upper Caley, the Milne hydrocarbons would require additional evaluation to substantiate the hydrocarbon part. The nicely end result has elevated confidence within the presence of huge hydrocarbon columns within the Baxter and Milne reservoirs, which ought to end in a major enhance in gasoline sources relative to pre-drill estimates.
Wireline strain testing has confirmed that each one the reservoirs are in strain communication with the equal intervals in Dorado-1, mitigating one of many key pre-drill dangers to a future improvement. Hydrocarbons have additionally been recovered from every reservoir interval through wireline sampling. Initial indications are that fluid compositions are much like the sunshine oils and gases that had been sampled in Dorado-1, the place condensate yields ranged from 190 to 245 barrels per million customary cubic toes within the Upper Caley, Crespin and Milne Formations, and from 70 to 90 barrels per million customary cubic toes within the Baxter Formation.
Santos Managing Director and Chief Executive Officer Kevin Gallagher mentioned: “This is a superb end result which signifies the Dorado discovery is bigger than anticipated and which considerably de-risks a future improvement.”
“The worth of the invention is vastly enhanced by the top quality reservoirs and fluids and the shallow-water setting, which ought to facilitate a cost-competitive improvement,” Mr Gallagher mentioned.
“Dorado opens a brand new basin with excessive prospectivity in permits the place Santos has a excessive fairness place and wealthy exploration stock with potential to considerably develop the useful resource base.”
“Acquisition of a serious new seismic survey, the Keraudren 3D survey, is in progress to mature further exploration alternatives for drilling alongside this important hydrocarbon useful resource play,” Mr Gallagher mentioned.
Dorado-2 is positioned in petroleum allow WA-437-P (Santos 80% and operator, Carnarvon Petroleum 20%). It is in Commonwealth waters roughly 160 kilometres north of Port Hedland and two kilometres away from the Dorado-1 discovery, made in July final 12 months.
The nicely was drilled utilizing the jack-up cell offshore drilling unit, Noble Tom Prosser in a water depth of 91 metres and reached a complete depth of four,573 metres.
Once wireline logging operations are accomplished, the nicely can be plugged and deserted as deliberate, and the rig will transfer to the Roc South-1 exploration nicely earlier than returning to drill Dorado-Three.
(Source: Santos – Image: Noble Tom Prosser jackup)


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