Quadrant Energy Pty Ltd, via subsidiary company, Quadrant Northwest Pty Ltd, suspended operations, after completing drilling and evaluation, at the Dorado 1 wet gas exploration well in WA-437-P, located in the Bedout Sub-basin, in early August 2018. Joint venture partner Carnarvon Petroleum reported that wireline logs, undertaken at a total depth of 4,639 m, had confirmed additional oil pay within the Crespin and Milne members.  With the oil already encountered in the primary target Caley Member, a total 132 m net hydrocarbon pay was encountered in the well, with an additional 40 m observed within the secondary target Crespin and Milne units.  First oil was encountered in the Caley Member and in late July 2018 intermediate wireline logging and evaluation was completed, confirming oil in this unit, as well as gas and condensate in the upper Baxter Member.Â  Wireline logging was undertaken after the operator drilled the 8-1/2â hole to a depth of approximately 4,044 m. The significance of gas indications observed from cuttings and while logging during drilling warranted the wireline logging programme to be brought forward, having originally been planned on achieving total depth.   Carnarvon reported that an âexcellent reservoirâ unit had been encountered within the Caley target, with 79.6 m net pay over a 96.1 m gross interval.Â  Average porosity of 20%, with 82.5% hydrocarbon saturation and permeability between 100 and 1,000 mD has been measured within the Caley.Â  Light oil was also recovered to surface as part of the logging and evaluation programme, estimated at 49.6Âº API.  Light oil was recovered from both the Crespin and Milne units during the latter evaluation.Â  Net pay of 22 m, across a 50 m gross interval, was confirmed in the Crespin and 18 m net pay within a 30 m gross interval within the Milne Member.Â  Average porosities of 14% and 13% were observed respectively.  In addition, earlier in the drilling operations, gas and condensate samples were acquired from the top Baxter unit during intermediate testing. A total 10.5 m net pay, across a 21 m gross interval, has been estimated. However additional information would be required on the Baxter to determine its characteristics, as it was not completely drilled through in the Dorado 1 well.  Pressure data has confirmed that the multiple oil columns, as well as the gas and condensate in the Baxter Member.Â  No water was encountered within the Caley, Baxter or Milne sands, though a water contact was observed within the Crespin unit.  Dorado 1 was spudded the Dorado 1 on around 5 June 2018.Â  Planned total depth was revised, from 4,550 m to 4,650 m, to allow the well to drill through the deeper target units, before the additional wireline logging was undertaken. The well is being drilled by the âEnsco 107â J/U rig, which arrived onsite around 23 May 2018 and awaited swell conditions to subside before spudding. Â The well is in a water depth of around 91 m.  With drilling and evaluation fully complete, the joint venture plans to shortly offer revised resources estimates.  Previously, in June 2018, Carnarvon reported that elevated gas readings had been observed within a number of Caley Sandstone intervals between 3,853 and 3,947 m. Oil shows were also encountered in the Hove Member.Â  Though Carnarvon reported the Hove would not be tested at this well, it may lead to targets of this interval in future wells.  The Dorado prospect is located in the centre of WA-437-P, approximately 17 km southwest of Roc 1, and is estimated to cost around AUD 50 million to drill. The prospect is on trend with the Phoenix, Phoenix South and Roc discoveries. Dorado 1 is targeting stacked sands within the Caley Sandstone Member of the Middle Triassic Lower Keraudren Formation as a primary objective. The trapping mechanism of the prospect relies on dip closure and the erosional truncation of the Caley and Milne members by the Dorado Canyon which was subsequently filled by shales that are juxtaposed against the target reservoirs.   Mean prospective resources have been reported by joint venture partner Carnarvon Petroleum as 545 Bcf gas and 32 MMb condensate in the Caley 1 sand and potentially 500 Bcf gas and 29 MMb condensate in sands 2 - 5 (average per sand level). The deeper Milne Sandstone Member is considered a secondary target. Carnarvon reported that total Pmean reserves have been estimated in the order of 2.5 Tcf gas and 147 MMb condensate. A discovery at Dorado could lead to a number of development scenarios for the Phoenix area fields.   The commitment to drill in WA-437-P lies in Term Six, which was suspended for 18 months from 4 February 2016 following the drilling of the Roc 1 well. The suspension was approved to allow time for the completion and interpretation of the Bilby 2D and Capreolus MC3D seismic surveys before further exploration/appraisal work was considered. Roc 2 was subsequently drilled in July 2016.  WA-437-P, which covers an area of 4,871 sq km, was awarded on 4 August 2009. Participants in the permit are: Quadrant Northwest Pty Ltd (80% + Operator) and Carnarvon Petroleum Ltd. (20%).
Dorado 1 (Quadrant 80% op, Carnarvon 20%) in WA-437-P (Gr. Phoenix area), light oil discoveries had been made in the Crespin and Milne Members, adding an additional 40m of net oil pay. This takes the total hc net pay in the well to 132m, which also includes the previous light oil discovery in the Caley Member sst, as well as gas and condensate in the Baxter Member.