| Abstract Submission No. | ABS-1.3-0019 |
| Title of Abstract | Delineating CO2 Plume Boundary and Reservoir Heterogeneity Using Seismic Inversion Derived Acoustic Impedence and Vp/Vs Cubes |
| Authors | ANKIT KUMAR* |
| Organisation | IIT ISM DHANBAD |
| Address | IIT ISM DHANBAD DHANBAD, JHARKHAND, India Pincode: 826004 E-mail: 23mc0010@iitism.ac.in |
| Country | India |
| Presentation | Poster |
| Abstract | The Sleipner CO₂ storage project in the North Sea offers a valuable opportunity to study plume migration and reservoir heterogeneity using time-lapse seismic methods. This research aims to map the CO₂ plume boundary and evaluate reservoir variability through seismic inversion of acoustic impedance and Vp/Vs cubes derived from Sleipner baseline and 4D monitoring seismic surveys, calibrated with logs from injection well 15/9-A-16 and monitor well 15/9-13. Seismic inversion provided high-resolution acoustic impedance and elastic property estimates, which were integrated with rock physics analysis to interpret reservoir changes caused by CO₂ injection. Acoustic impedance anomalies were used to distinguish CO₂-saturated zones from brine-bearing intervals, while Vp/Vs variations revealed lithological controls and fluid substitution effects within the Utsira Formation. Time-lapse analysis highlighted the spatial and temporal evolution of the injected plume, improving constraints on its geometry and migration pathways. Reservoir heterogeneity was further assessed by combining well log data with inversion-derived attributes to capture vertical and lateral variations in lithology and fluid distribution. The findings show that using both acoustic impedance and Vp/Vs cubes provides greater sensitivity to CO₂ saturation and heterogeneity patterns than conventional amplitude-based seismic methods. This integrated approach enhances monitoring accuracy, supports better predictions of plume evolution and reservoir performance, and contributes to ensuring long-term storage security and verification in geological carbon storage projects. |
| Keywords | Keywords: Sleipner Field, CO₂ plume monitoring, seismic inversion, acoustic impedance, Vp/Vs ratio, reservoir heterogeneity, 4D seismic |