Roc Oil to Sidetrack Massambala-1

Roc Oil (Cabinda) Company says that the ROC-owned "Explorer" rig had directionally drilled the Massambala-1 exploration well in the Cabinda South Block, onshore Angola, to final Total Depth of 2,192 meters below rotary table ("mBRT") and completed wireline logging. The current operation at the well is preparing to drill a shallow side track hole.

Current interpretation of the results of the drilling and wireline logging program suggest that:

The main zone of interest in Massambala-1 lies between 394 mBRT and 433 mBRT where good oil shows were observed over a gross interval of 39 meters. Of particular interest are anomalous log responses, which could be interpreted as indicating moveable hydrocarbon, over a 20 meter gross interval within the zone of good oil shows. Other minor log anomalies exist above and below this zone, but do not coincide with oil shows. The 20 meter interval of most interest exhibits good to excellent potential reservoir quality with 18 meters (90%) net sand with an average porosity of about 27%. However, wireline sampling did not recover any oil from this zone of interest which, when combined with pressure gradient measurements, raises the spectre that the zone represents a heavy oil accumulation or, possibly, a residual oil column.

The well's primary pre-drill target had no indications of hydrocarbons. The forward program at Massambala-1 is to plug the well back and sidetrack in order to core the shallow zone of interest referred to above. This operation is expected to be completed within two weeks.

After drilling operations at Massambala-1 are complete, the rig will move to drill Cevada-1 in the eastern part of the Block.

Consistent with the most recent schedule, the Simmons 80 Rig arrived in Cabinda in late July and is expected to start drilling Soja-1 prior to the end of August.

Commenting on the results of Massambala-1, ROC's CEO, Dr John Doran, stated that: "Because we are at the beginning of a big drilling campaign, it is essential that we try to nail the exact nature of the shallow oil zone at Massambala-1 as soon as possible because if it proves to be producible, the upside potential is well worth chasing."

Participating Interests in the Cabinda South Block are Roc Group Companies as operator with 60%; Sonangol P&P SA with 20% and Force Petroleum with the remaining 20%.


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