The well tested oil from the top of the reservoir section and has subsequently been deepened to 4894m total vertical depth. Interpretation of pressure data obtained to date infers an oil-water contact around 4760m TVD.

The height of the known hydrocarbon column in the Jeruk structure is now considered to be about 145m, compared with the originally interpreted 379m.

This has reduced the most likely contingent resource to less than the 170 million barrel estimate previously provided to the market in January 2005.

This is a complex reservoir and further appraisal will be required to determine whether a common oil water contact exists across the structure.

A test of the bottom hole section of the Jeruk-3 appraisal well is planned for next week. This test is expected to confirm the interpreted location of the oil-water contact, and provide further reservoir and pressure data.

Following the completion of Jeruk-3, the rig will be released to drill other Santos wells, allowing time to integrate well and seismic data to better determine the most likely resource range.

The participants in the Sampang PSC are operator Santos (Sampang), which holds a 40.5% stake, Singapore Petroleum Sampang (36%), Cue Sampang (13.5%) and PT Petrogas Oyong Jatim (10%).