The Mailisu III-4 well is located about 880m south east of Mailisu III-3 well site and will test oil targets in shallow Palaeogene limestone reservoirs.

Caspian's earlier Mailisu III-3 well was flow tested at 25-50 barrels of oil per day, with a minor water cut.

The Mailisu III field is estimated to contain 2.7 million barrels of oil in-place at the P90 level of confidence, of which only 400,000bbl is estimated to be recoverable.

Caspian estimated that with 20 wells producing between 10-50bpd, the field would have produced 95,000-125,000bbl by the end of 2009.