GEO ExPro

Mozambique: 2nd Giant Discovery in Block

As reported in GEO ExPro Vol.8, No. 6, exploration in the Mozambique’s deepwater Offshore Area 4 looks to be following the trend set by drilling in Area 1 to its west.
This article appeared in Vol. 9, No. 2 - 2012

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Modified from Instituto Nacional de Petróleo After Mamba South was revealed at the end of 2012 to hold up to 22.5 Tcfg, it was announced in mid February that Mamba North 1 was found to have potentially of 7.5 Tcfg in place, bringing the total reserve in the block to a massive 30 Tcfg. During production testing - the first time this has been undertaken in the offshore Rovuma Basin – the well produced high quality gas with flow rates, constrained by surface facilities, of about 35 MMcfgpd. It is estimated that the gas production per well will reach over 140 MMcfgpd.

The new discovery well, which lies 23 km to the north of Mamba South and 45 km from the coast, in water depths of 1,690m, reached a final depth of 5,330m and found a total of 186m gas pay in multiple high-quality Oligocene and Paleocene sands. The operator, ENI, now plans to drill at least five more wells this year on nearby prospects and structures to assess the total potential of the Mamba area.

At the same time, the 10,500 km2 Block 1 has been the site of yet further success, with appraisal well Lagosta 3, which was spudded in January, encountering high-quality sands, with 176m of gas pay. The reservoir is in communication with the Lagosta 1 discovery well, which lies 3 km further west, and up to 30 Tcfg have been discovered in the block so far. Lagosta 3 was drilled to a total depth of 4,180m in water depths of over 1,400m. The well was suspended for the rig to undertake flow testing at the Barquentine discovery, a few kilometres to the north. This was the first such testing undertaken in Mozambique by the operators, Anadarko, and the well successfully flowed at an equipment-constrained rate of 90 to 100 MMcfgpd with minimal pressure drawdown, suggesting that production could be as high as 200 MMcfgpd.

Anadarko and its partners are now in the process of designing a scheme to exploit the gas, with a flexible offshore production system at the fields, which are about 55 km from the coast. This will send the gas to an onshore LNG processing plant with initially two trains, but with the flexibility to expand to six if necessary. According to Anadarko, the project is well under way to becoming the second largest LNG project in the world.

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