Tambak-1 well confirms Mako as ‘very valuable gas resource’

Conrad Petroleum has flowed dry gas from its Tambak-1 well located in the Duyung PSC in the West Natuna Basin, offshore Indonesia.


The Tambak-1 well was designed to both appraise the Mako gas field and test the underlying Tambak exploration prospect.

Coro Energy, a partner in the Duyung PSC, said on Friday that Tambak-1 flowed dry gas at a maximum flow rate of 11.4 mmscf/d following the drill stem test (DST).

According to the company, operations have concluded, resulting in a successful appraisal of the Mako gas field. The Tambak-1 well encountered 24 meters of intra-Muda reservoir sandstones, which was substantially thicker than predicted, confirmed a common gas-water contact across the field, and resulted in a DST reflecting the potential deliverability of the Mako reservoir.

Coro added that the well was deepened beneath the Mako field to a depth of 1,543 mTVDSS to test the Tambak exploration prospect.



The well encountered multiple sandstone intervals in the Lower Gabus section as predicted, with the corresponding hydrocarbon shows seen while drilling. However, petrophysical interpretation of wireline log data has concluded that these sandstones have low gas saturation and attempts to collect fluid samples and pressure data demonstrate low permeabilities.

The well is currently being plugged and abandoned as planned, prior to the Asian Endeavour 1 rig being demobilized.

The company also stated that the drilling campaign was completed within the expected time frame and within budget.

James Menzies, CEO of Coro Energy, said: “We are very pleased with the flow test results announced today and the appraisal results overall from this drilling campaign, which confirms the Mako field as being a very valuable gas resource.

“The data demonstrates the excellent reservoir characteristics across a huge areal extent, with good porosity, high permeability, and the DST has again demonstrated the deliverability of the Mako reservoir.

“We are delighted with the additional resource that has been proved up in the Mako field as a result of this campaign, which we believe enhances the commercial attractiveness of the project. Coro management estimate that the campaign has demonstrated a gross resource addition of at least 100 Bcf and we look forward to the independent assessment of field resources which will follow.”

Coro also said that the information collected from this campaign would be used to revisit the resource estimates for the field. The Duyung PSC partners will be commissioning an independent assessment of resources, which is expected to be completed in the first quarter of 2020.


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