Indonesia’s national oil and gas company Pertamina is set to embark on an in-depth study next month on the viability of its East Natuna asset, which is home to South-East Asia’s largest unexploited gas resource.

The East Natuna block, formerly Natuna D-Alpha, hosts previously estimated recoverable reserves of 46 trillion cubic feet of gas.

However, its remote location and high — about 70% — carbon dioxide content translates to development costs running to around US$40 billion.

Pertamina’s