Tambak Well Proves Indonesian Find
The consortium developing the Mako gas project offshore Indonesia has added some 100bn ft3 of 2C gas resources with its Tambak 1 and 2 wells, junior partner Coro said November 13. It described it as a very significant value addition for the Duyung production-sharing contract.
Some 4.5 km north of the Mako South-1 well, Tambak 1 intersected the intra-Muda reservoir of the Mako field, confirming the field's large geographical spread.
The well also encountered a much better developed sand package than expected with "excellent porosity & permeabilities." In addition to the upper unit, a thick, lower sandstone unit of almost 20 metres was found, providing an overall gross thickness of about 25 metres of intra-Muda sandstone, compared with a 7.3 metre reservoir sandstone seen in Mako South-1, providing volumetric upside potential for the field. Pressure data confirm the same pressure system as Mako South-1 and Tambak 2.
An independent review by Gaffney Cline & Associates had previously ascribed gross 2C resources of 276bn ft3 of recoverable dry gas in the Mako field with gross 3C resources of 392bn ft3 representing additional field upside.
As a next step, Tambak 1 well will be drilled to a depth of about 1,370 metres beneath the sea in order to test the potential of the deeper Tambak prospect. Coro estimates Tambak to have a mid-case prospective resource potential of 250bn ft3 and a geological chance of success of 45%. The Tambak 1 well is planned to be plugged and abandoned once operations are complete.
Conrad has 76.5%, Coro has 15% and Empyrean has 8.5% in the Duyung PSC. They began drilling the well less than two weeks ago.