Porosity Distribution Estimation Based on Seismic Inversion and Multiattribute Seismic

Abstract

Porosity mapping in carbonate reservoir based on seismic inversion and multiattribute seismic analysis has been done. Data used in this research were 3D seismic data, well logs, and geological information. According to geological report known that hidrocarbon traps in research area were limestone lithological layer as stratigraphical trap and faulted anticline as structural trap. Model based inversion was generalized to the seismic data and yielded an acoustic impedance volume as a result. Impedance volume and seismic data were used as input in multi attributes seismic analysis to obtain total porosity volume. Total porosity was derived from density log and neutron porosity log. Interpretation was done by made a horizontal slice of acoustic impedance and porosity volume. Based on impedance and porosiaty maps known that limestone lithological streak between BRF horizon to top TAF consist of variety of limestone from tight to porous carbonate with its acoustic impedance value range 9000 – 11500 m.s-1.g.cc-1 and porosity value between 8 – 19 %. Distribution of carbonate layer in this research field was inclined to North-West direction.