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Duo finds riches at Dorado

July 18, 2018 | Singapore | OSEA2018 Industry Insights

Duo finds riches at Dorado
Exploration well off Western Australia uncovers light oil in primary target

Australian partners Quadrant Energy and Carnarvon Petroleum have made an oil discovery with their latest exploration well in the Greater Phoenix Area off Western Australia.

Carnarvon confirmed Wednesday the Dorado-1 well had made an oil discovery in the in the Caley Member, recovering light oil from “excellent reservoir”, while adding an additional hydrocarbon accumulation had also been observed in the Baxter Member.

Wireline logs confirmed the well had intersected a gross 96.1-metre hydrocarbon package, with 79.6 metres of net pay, in the Caley Member and estimates of the oil characteristics from the rig indicated a 49.6 degree API oil.

Carnarvon said the combination of light oil and excellent reservoir characteristics supported the potential for high flow rates on production.

“This is a significant discovery given the quantum of the net pay thickness, the quality of the oil and the extremely good reservoir characteristics,” Carnarvon managing director Adrian Cook said.

“With multiple targets still left, the focus now is to complete the drilling program through the Baxter, Crespin and Milne Members.”

It comes after Carnarvon last week revealed elevated gas readings and increased resistivity were observed in interpreted porous and permeable zones within the primary Caley Member.

As of Wednesday, the well was at a depth of 4044 metres and still in a hydrocarbon bearing column, with evaluation and drilling of the Baxter still yet to be completed.

Carnarvon also noted that wireline logging tools had yet been able assess whether the pay found in the Baxter was part of the same accumulation as in the Caley or a new accumulation of oil.

Dorado-1 will now be deepened to a depth of 4550 metres to further evaluate the Baxter as well as the secondary Crespin and Milne targets.

Prior to drilling, Carnarvon had been targeting gas and condensate at Dorado, estimating the well to hold 545 billion cubic feet of gas and 30 million barrels of condensate.

In April, it had said the well had the possibility to contain a substantial oil accumulation and it plans to issue a revised volume estimate following the completion of drilling, which will be a contingent resource of oil.

The find at Dorado keeps Quadrant and Carnarvon’s 100% success rate in the Greater Phoenix Area in tact with the four previous wells drilled all successful.

Dorado lies about 20 kilometres, and up-dip, from Quadrant’s successful Roc-1 and Roc-2 wells, with the latter flowing at about 55 million cubic feet of gas per day, with an associated condensate rate of 3000 barrels per day, during testing.

The Roc discovery has a best estimate resource of 332 Bcf of gas and 20 million barrels of oil, while Phoenix South-1 is estimated to contain 7 million barrels of oil.

Meanwhile, drilling is also still underway on a sixth well, the Phoenix South-3 appraisal well which is a e-drill of Phoenix South-2 that discovered gas and condensate but could not assess the reservoir below 5215 metres due to higher than anticipated pressures.

The joint venture’s current preferred development concept for the Greater Phoenix Area envisages a central wellhead platform and a floating production, storage and offloading vessel for the oil.

Quadrant has an 80% operated interest in Phoenix with Carnarvon on 20%.

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