Zero-Offset VSP Monitoring of CO₂ Storage: Impedance Inversion and Wedge Modelling at the Ketzin Pilot Site

Figure 6

1D seismic-elastic model based on sonic and density logs of the Ktzi202 observation well [21]. Left: P-wave and S-wave velocity model. Thin black line: P-wave sonic log of Ktzi202. Thick black line: blocky P-wave model layers. Red line: reservoir layer with a velocity reduction of 30%. Thin green line: S-wave sonic log of Ktzi202. Thick green line: blocky S-wave model layers. Right: density model. Thin black line: density log of Ktzi202. Thick black line: blocky density model layers. Red line: reservoir layer with a density reduction from 2.2 g/cm³ to 2.1 g/cm³. The depth is in meter below ground level (m b.gl.).