Good gas shows have been encountered over a 25m interval at the top of the Mundu formation, which was penetrated at a depth of 1,343m, while gas and oil shows were encountered in an over pressured zone from 1,574 to 1,633m. However, the deeper zone is interpreted to have poor reservoir quality.

Venture partner El Paso has proposed conducting further evaluation of the well on a sole-risk basis, including evaluating the possiblity of an oil zone immediately beneath the top Mundu gas zone and the evaluation of the gas and oil shows seen from 1,574 to 1,633m in poor reservoir quality rock.

Both Cue Energyand Santos have declined to join the sole risk.

Wire line logs have since been run to a depth of 1,575m (near the top of the plug) and indicate the presence of a 12m gas zone in good quality reservoir at the top of the Mundu.

An attempt to obtain pressure information and potential wire line samples was unsuccessful due to sticking of the tool.

Located about 35km west of the Oyong field in 11m of water Mangga-1 is testing the Mundu Formation, which contains oil and gas in the Oyong oil and gas discovery, within a four way dip closure, about 110m updip of gas shows in the Anggur -3 well.

The well is estimated to contain a potential 110 billion cubic feet of recoverable gas (P50 case) up to a high side case of approximately 320 billion cubic feet of recoverable gas.

Participants in the Sampang PSC are Cue Sampang 15%, Santos (Sampang) 45% (operator) and Coastal Indonesia Sampang (El Paso) 40%.