Quadrant Energy has encountered a 10m section of elevated gas readings its Roc-2 well, in addition to moderate fluorescence that indicates exploration potential in the area offshore Western Australia.
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Map of Roc-2, from Carnarvon. |
Natural gas and fluorescence readings were observed at about 3250m measured depth, across a sandstone interbed within the Upper Keraudren, consistent with residual hydrocarbons, according to partner Carnarvon Petroleum.
Slightly deeper in the well, from around 3360m measured depth, elevated gas readings and minor fluorescence were observed in the Cossigny limestone. This hydrocarbon fluorescence has regional interest because it is the first case of hydrocarbons migrating above and within the Cossigny, and increases the exploration potential of the area, Carnarvon said.
The Roc-2 well is within exploration permit WA-437-P on the North West Shelf of Australia.
Since the last report the 17.5in (44 mm) hole has been drilled to 3433m measured depth, just below the Cossigny marker. The well is in the process of setting the 13-5/8in (346mm) intermediate casing.
Following the cementing of the 13-5/8in casing, a further 850m of intermediate 12-¼in (311mm) hole will be drilled down to just above the primary Caley target, and a 9-5/8in (245mm) drilling liner will be placed across this open hole to enable the well to drill to its deeper targets.
The Huxley and Barret formations are expected to be encountered in the 12-¼in hole section. The Barret sands were oil charged at Phoenix South-1 well and water wet at Roc-1 well. In the Roc-1 well, hydrocarbon shows were observed in the Huxley sands and further data on this potential reservoir section will expand the exploration portfolio outside this well, particularly for prospects outside this area such as Bandy.
The primary target for the Roc-2 well, which was spudded in July, is the Caley sands which were gas and condensate charged in Roc-1. This zone is expected to be cored late August or early September 2016.
Quadrant is the operator of WA-437-P with 80% stake, with partner Carnarvon holding the remaining 20%.
Yesterday (15 August), Quadrant announced its disappointing results at its Driftwood-1 well, also offshore Western Australia, after only finding minor oil shows, with water wet objectives.
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