The Cayman Islands-headquartered company, which has an 85% interest in the area, did not disclose the potential partner in the venture according to a statement Tuesday. It aims to close a deal by year's end.

A resource estimate from Gustavson Associates for the Tajik project estimated "total gross ... unrisked recoverable prospective resources" of 27.5 billion barrels of oil equivalent.

The company's 870-kilometre 2D seismic programme there has acquired 37% of its field data, it said.

Meanwhile,