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Thursday, March 20, 2014
Drilling operations on Ophir Energy’s Padouk Deep-1 well on Gabon’s Ntsina Block have concluded without encountering any significant hydrocarbon shows in the targeted reservoirs.
The well was drilled by the Vantage Titanium Explorer drillship to a depth of 3,297 meters TVDSS targeting the Cretaceous Gamba and Coniquet/Dentale sands in the pre-salt section. Thicker than expected, good quality Gamba and Coniquet/Dentale reservoir sands were encountered but hydrocarbons were not found to be sufficient for a commercial find.
Minor shows were interpreted at shallower intervals providing evidence of a working hydrocarbon system in the offshore North Gabon Basin. In addition, well log responses in the deeper pre-salt stratigraphy are similar to those observed onshore Gabon where they are indicative of an interbedded pre-salt source and reservoir system. Full analysis and interpretation of the log data is ongoing.
Ophir said the key pre-drill risk was that of seal and trap integrity. The lack of the anticipated thin salt drape over this high relief prospect and the lack of sealing shales within the targeted reservoirs appear to be a cause of the prospect’s failure.
The Vantage Titanium Explorer will now move to the Gnodo Block to drill the Affaga Deep prospect, which has the potential to hold mean recoverable resources of 170 million barrels. The drilling of the well will also derisk several follow on prospects which could provide the basis for a hub development. The rig will then return to target the Okala pre-salt prospect on the Mbeli Block.
Nick Cooper, CEO, commented: “The Padouck Deep-1 result is disappointing but its failure appears to be prospect-specific and does not dampen our enthusiasm for the broader pre-salt play offshore Gabon. The well did confirm the presence of thicker than anticipated, good quality reservoir sequences and also evidence of a working hydrocarbon system. Despite the lack of commercial success with Padouck Deep-1, these are positives for future exploration of the play. Trap integrity was identified as the key risk pre-drill and the absence of salt across this prospect is likely to have contributed to the result. The next pre-salt well will be on the Okala prospect where a thick salt section is interpreted above the target reservoirs.”
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