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

Figure 7

Acoustic impedance log (right) derived from the sonic and density logs (left and middle) of Ktzi202. The sonic and density logs are median filtered and converted from depth to two-way-time. Since the location of the K2 of the 3D surface seismic varies in time, the two-way-time function is shifted to the K2 for each trace. Here, as an example, the adjustment to the stacked zero-offset VSP baseline is shown (Figure 8, top left image).