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Image courtesy of Cairn Energy.

Cairn Energy said Thursday that its SNE-4 appraisal well in offshore Senegal successfully confirmed the extension of the SNE field.

Cairn said operations at the well have been safely and successfully completed following drilling, coring and logging.

The SNE-4 well was appraising the eastern extent of the SNE field discovered in 2014 and aimed to confirm the nature of the upper reservoirs in the oil zone.

SNE-4 is located in about 3,090 feet of water, 53 miles offshore in the Sangomar Offshore block.

Cairn said initial results confirmed the extension of reservoirs in the eastern extent of the SNE field, more than three miles to the east and down dip of SNE-3.

The results also confirmed an oil bearing upper reservoir sands of similar quality to those encountered as gas bearing elsewhere in the field, Cairn said.

The uppermost gas sands first encountered in SNE-3 and BEL-1 were also present and gas bearing in SNE-4.

The SNE-4 well also confirmed the correlation and presence of the principal reservoir units between each of the wells across the whole field.

The well encountered a gross oil column of about 100 meters, similar to wells SNE-1, SNE-2, SNE-3 and BEL-1.

Cairn said a 108 meter continuous core was taken across the oil bearing reservoir interval with 100 percent recovery.

Multiple samples of gas, oil and water were recovered to surface and initial indications confirm similar 32° API oil quality as seen across the field.

The well reached its planned total depth of 9,658 feet below sea level.

UK-based Cairn said its analysis of the dataset collected is continuing.

The well is now being plugged and abandoned.

Cairn has a 40 percent working interest as operator in three blocks offshore Senegal: Sangomar Deep, Sangomar Offshore and Rufisque.

ConocoPhillips has a 35 percent working interest, FAR Limited has a 15 percent working interest and Petrosen, the national oil company of Senegal, holds a 10 percent working interest.

The Ocean Rig Athena will now be de-mobilized.

Cairn said the joint venture will continue integrating the “significant amount of data collected” from its four wells, including two drill stem tests and more than 600 meters of core.

“We have gathered a very large volume of data from operations to date and we look forward to progressing our long-term, multi-field, multi-phase exploitation plan to maximize value in Senegal. We see clear potential to access additional cost savings from the current lower operating environment in respect of planned future activity,” Cairn Energy Chief Executive Simon Thomson said.