PROCEEDINGS, INDONESIAN PETROLEUM ASSOCIATION Thirtieth Annual Convention & Exhibition, August 2005 SEISMIC RESERVOIR CHARACTERIZATION OF THE ABADI GAS FIELD, MASELA PSC BLOCK, WEST ARAFURA SEA, EASTERN INDONESIA.

This paper presents the results of seismic inversion work of the Abadi gas field in Masela PSC Block, West Arafura Sea, Eastern Indonesia. The field was discovered in 2000 and has undergone a series of reservoir characterization programs, which include seismic inversion, depth conversion and reservoir geology. The basic data sets for this study consist of 2,060km 2 of 3D seismic, and well data of Abadi-1, Abadi-2 and Abadi-3. A discrepancy exists between velocity measurements in wireline logs and those in laboratory core sample measurements. It is essential to reconcile this discrepancy for calibration of seismic-inverted properties. A method of rock physics modeling was applied, first in order to correct the log data and secondly to optimize the seismic inversion. Quantitative relationships were identified between the seismic-inverted and petrophysical properties by the modeling. Intensive ultra-sonic measurements on core samples were conducted to properly calibrate the seismic-inverted properties. Seismic inversion was conducted for the 3D seismic data and the modeled sonic and density logs of the three wells. Three Elastic Impedance (EI) volumes were constructed from three reflection-amplitude-angle stacks. Based on the relationships between seismic-inverted and petrophysical properties, the EI volumes were converted into a total porosity volume and a lithology