Rialto Provides Update on Starfish Prospect Drilling (Ghana)

Rialto Provides Update on Starfish Prospect Drilling (Ghana)

Rialto Energy Limited provides the following update on the Starfish-1 oil exploration well in the Offshore Accra Contract Area, Ghana.

The well will target a large stratigraphic trap in the deep water of eastern Ghana, interpreted to be potentially comparable to the Jubilee oil field in western Ghana. The operator, Ophir Energy Limited (“Ophir”), estimates mean prospective resources of 292 MMBOE with a 20% chance of success.

Location and Proposed Depth

The Starfish prospect is located in the Offshore Accra Contract Area, offshore Ghana, along the prolific offshore West African Margin. The Starfish prospect was matured following reprocessing of the original 3D seismic data and the acquisition of the new 3D survey in 2011 over the outboard deep water area.

The Contract Area is now covered by quality 3D seismic data. In the event of a discovery at Starfish-1 confirming a significant petroleum system, there are a number of other leads and prospects identified on the block that would be of interest. Ophir continues to work on the existing lead and prospect inventory.

The well was spud on 19 June and will be drilled as a vertical well in a water depth of 1,500 metres and is expected to take 40 days to drill to a proposed total depth of 4,560 metres.


During the period from 1400 hours (AWST) on 19 June 2013 to 1400 hours (AWST) on 25 June 2013 the well was drilled to a depth of 2,627 metres. The 20″ (508mm) casing was run and set at 2,218 metres and the BOPs were installed, prior to drilling ahead in the 17½” (444.5mm) hole section. 

Forward Plan

The forward plan is to drill ahead in 17½” (444.5mm) hole to the next casing point planned at 2,889 m metres.


Press Release, June 26, 2013