Cairn Energy subsidiary MedOil has plugged and abandoned a well offshore Tunisia in the Louza block after finding only minor evidence of light oil.The M'Sela West 1 well reached a total depth of 2,555m in the Serdj formation. "Although minor evidence of light oil was observed, the expected Isis target reservoir was not developed in the well. The well has been plugged and abandoned without testing," Cairn said, adding that the Ensco 85 rig has been released. Cairn has an 85% interest in the Louza permit with the remaining 15% held by Dyas.