Carnarvon Petroleum Limited (ASX:CVN) believes there is sufficient potential in the deeper Crespin and Milne intervals to continue drilling the Roc South-1 exploration well on the North West Shelf offshore WA.
The well will continue to the planned total depth of about 5,100 metres measured depth (MD).
This decision has been made after the interpretation of wireline logs indicated no producible hydrocarbons across the Caley and Baxter sands, which were other targets in the well.
With the 8.5” hole been drilled to about 4,508 metres MD, operations to run a 7” liner are underway, after which this final section will be drilled in 6” hole.
Carnarvon managing director Adrian Cook said: “Our tremendous success to date has occurred through making significant discoveries, most particularly around Dorado and Roc.
“As we unlock this new basin on the North West Shelf, we will find results that are unexpected and not as we should wish.
“The Roc South-1 result in the Caley and Baxter intervals is a case in point in that it will not build upon our current resource pool.”
“Significant resources to date”
“That said, we should not lose focus on the fact that we have discovered a significant volume of resources to date, we are working on plans to bring the Dorado liquids (oil and condensate) into production as soon as possible and we have ongoing intentions to make new discoveries in the future,” he said.
“We will now test the deeper sections in the Roc South-1 well before the rig moves to the Dorado-3 appraisal well where it will conduct a flow test from the Dorado reservoirs that proved successful in the Dorado-1 and 2 wells.”
Results from Roc South-1 are expected to assist in the refinement of other exploration prospects in the area.
As evidenced by results to date in the Dorado field, each reservoir interval is capable of being charged with different hydrocarbons and varying levels of fill.
Testing potential in Crespin and Milne members
This leads the company to believe that there is sufficient potential in the deeper Crespin and Milne structures to continue the well.
The objective of the Roc South-1 well was to determine if additional hydrocarbons existed that were capable of being tied-in and produced with the Dorado liquids (oil and condensate) and gas production facilities.
Development plans for Dorado will not be impacted by the Roc South results in the Caley and Baxter intervals.
Carnarvon said new 3D seismic data that was being acquired was expected to provide more relevant information over the Dorado development area and a number of key prospects nearby.
Dorado, Roc and Roc South reside in WA-437-P in which Carnarvon holds a 20% interest.