KARAKTERISASI RESERVOAR BATUPASIR PADA LAPANGAN MENGGUNAKAN INVERSI ACOUSTIC IMPEDANCE (AI) DAN ELASTIC IMPEDANCE (EI)

Acoustic Impedance (AI) and Elastic Impedance (EI) inversion study had been done on field on Talang Akar Formation, Sub-Basin Jambi for reservoir characterization. AI method which involve P-wave velocity and density is insensitive to fluid. Thus, EI method which involve P-wave velocity, density and S-wave velocity implemented to made more sensitive to fluid presence. AI method had been done on seismic post stack data which inverted to AI volume to understand lithology of the field while EI method had been done on pre-stack seismic data gather which starts with super gather, then transform offset domain to angle domain and generate seismic near angle stack and far angle stack herein after inverted to generate EI volume near and far to perceive gas fluid distribution by gas zone selection based on crossplot inversion result of EI near and far. The result on AI section, sand zone is on 20,500 ft/s*g/cc up to 29,000 ft/s*g/cc and result of crossplot inversion EI near and far on sand zone, which potentially contain gas, obtained when EI far smaller than EI near. Reservoir distribution and potentially contain gas is on SouthWest to North of this area.