Being drilled using Atwood Eagle semi-submersible drilling rig, the well is scheduled to reach a minimum of 4,500m and can be extend to 5,000m based on the presence of gas below 4,500m.
The drilling campaign will continue for approximately 60-70 days including time for logging and testing.
Carnarvon Petroleum managing director Adrian Cook said that Carnarvon has spud the Phoenix South-1 well and is looking forward to the results in due course.
"This well has the potential to be a significant value driver for Carnarvon, but for now we are focused on supporting the Operator, Apache, and continuing with our business of securing new opportunities and sustaining oil production from our assets in Thailand," Cook added.
The Phoenix South-1 well primary target is the interbedded sandstones, siltstones and claystones of the Early to Middle Triassic Lower Keraudren Formation and underlying Locker Shale.
The sandstone packages, located 13km to the North of the Phoenix South-1 location, were gas-bearing in the Phoenix-1 well.