The Bentayan field is located on the northeast flank of the South Sumatra basin. Oil properties of this reservoir currently have oil gravity of 17°API and maximum viscosity recently from 82,2 cp to 113,7 cp. Bentayan field is considered as a heavy oil reservoir, and so far only 14% of Bentayan oil reserve has been produced.
Sungai Lilin oil field is located on the northeast flank of the South Sumatra basin, which suffered a production drop to 25 bopd and stable at 80 bopd with high water cut in 2007. This carbonate reservoir has a string oil wetting behavior. Previously, many IOR methods have been applied withour successful result. However, using SeMAR technology on ten production wells resulted on good responds (50% to 400% increase) in production peak.