US oil and gas explorer Anadarko Petroleum has completed the drilling part of its planned appraisal programme, off the coast of Mozambique.

The company revealed that Barquentine-4 well, the ninth well to be drilled in Offshore Area 1 of the Rovuma Basin, encountered around 525ft of natural gas pay.

The discovery area, named Prosperidade, also includes Windjammer, Barquentine, LAGOSTA and Camarao discoveries, as well as five appraisal wells.

The complex is estimated to hold recoverable resources of 17 to 30 trillion cubic feet of natural gas.

Anadarko senior vice president worldwide exploration Bob Daniels said: "Our appraisal drilling programme delivered outstanding results that provide significant confidence in the vast extent of this accumulation and will be key in achieving third-party reserve certification.

"Our next step is to mobilise the drillship to the northern section of our block to begin testing additional high-potential exploration prospects that may expand the resource even further and provide tieback opportunities for future LNG hub facilities."

Anadarko is the operator of the 2.6 million acre Offshore Area 1, with a 36.5% working interest, while other partners include Mitsui E&P Mozambique Area 1 with 20%, BPRL Ventures Mozambique and Videocon Mozambique Rovuma 1, which have 10%; Cove Energy Mozambique Rovuma Offshore, with an 8.5% interest; and Empresa Nacional de Hidrocarbonetos, which has 15%.