Measurement of Frequency-dependent P and S Impedance from 2D Data

Analysis of seismic data suggests that hydrocarbon bearing zones are often associated with high values of attenuation; this attenuation is associated with strong velocity dispersion. Due to dispersion, the impedance will be frequency-dependent. A frequency-dependent inversion has been carried out on synthetic data, and the results show that the impedance varies strongly with frequency in the dispersive medium but not in the elastic ones. We carried out this inversion on 2D PP field data, and the results show two consistent strong P and S impedance anomalies along the selected CMPs that might be interpreted as dispersive/reservoir zones.