Integrated Seismic Inversion, Fluid Index Analysis And Structural Feature For Outstep Area At Baturaja Formation In Karangkompleks Structure, Jatibarang Field, North West Java Basin

Author: Agung Dwi Alfianto, Bayu Dwijatmiko, Magfirah Rajab, Setyoadi Novantyono*

Setyo.novantyono@pertamina.com

Karangkompleks Structure is one of PT. PERTAMINA EP oil and gas producing in Jatibarang Field, North West Java Basin. One of the hydrocarbon producers of this structure are Carbonate reservoir in Baturaja Formation. The features of carbonate reef build up from PSTM data outside the existing wells area are still quite widely spread. PSTM data combined with Relative Acoustic Impedance attribute are able to map in detail several potential outsteps. To select the best area, Acoustic Impedance Inversion (Absolute) was applied for the distribution of properties and Fluid Index to analyze the presence of Hydrocarbon. AI inversion is carried out using post stack time data using a model based method. The fluid index uses pre stack/gather data with AVO analysis first to get the same response for the existing area with outstep. Finally, the results of the combination of these analyzes has been validated for existing area and identifying new prospect area.