Carnarvon Petroleum Limited’s (ASX:CVN) initial indications from the Dorado-2 appraisal well reveal that similar reservoirs have been encountered to those in the world-class Dorado-1 discovery.
These indications follow the extraction of 233 metres of whole well bore core from the well across the Caley and Baxter reservoirs.
Logging While Drilling (LWD) tools have logged across the cored section and to the well’s current depth.
Increased resistivity observed from LWD tools indicate porous and permeable zones with indications of hydrocarbons as anticipated in the Caley, Baxter and Milne members.
Wireline logging is required to obtain definitive results and this process will begin once the well has drilled to the total depth of around 4,548 metres Measured Depth (MD).
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The primary objective for extracting the core is to assist with development planning for the project offshore Western Australia.
As such, the core has been preserved and sent to laboratories in as original condition as possible.
Work will not begin on the core until after the analysis from the wireline has been completed.
Until this takes place the core is not able to be used to determine reservoir quality or hydrocarbon contacts.
Location of the Dorado-2 well down-dip of Dorado-1 discovery well.
Dorado-2 is the first appraisal well of the Dorado oil and gas field which was discovered in the latter half of last year.
Dorado-1 discovered hydrocarbon-bearing reservoirs in the Caley, Baxter, Crespin and Milne members of the Lower Keraudren Formation.
The Dorado project is a joint venture between Carnarvon, which holds 20%, and Santos Ltd (ASX:STO).
Map of WA-437-P showing the Dorado field.
Depth of around 4,500 metres
Early this morning the Dorado-2 well was drilling ahead in 8-1/2-inch hole size at a depth of around 4,500 metres MD.
It is planned to drill to about 4,548 metres MD and then obtain wireline logging information over the complete section of open hole encompassing the Caley, Baxter, Crespin and Milne members.
The wireline logging process includes fluid sampling and pressure testing, in order to obtain information about the quality of the reservoir sections and the nature of hydrocarbon fluids encountered, including estimates of oil-water contacts.
Drilling is in water depth of about 95 metres and the Dorado-2 well is 2.2 kilometres away from the Dorado-1 discovery.
Dorado-2 is about 160 kilometres north-northeast of Port Hedland in the Bedout Sub-basin.