Application of Inverse Q filtering Derived from VSP Data for Improving Surface Seismic Resolution

摘要

In this paper, we have completed a case study of using VSP seismic data to improve surface seismic resolution. The P- and S-wave velocities are computed from the recorded three component (3C) VSP, from which other elastic parameters such as bulk modulus (K), Poisson’s ratio (σ) are calculated. Using the down-going wavefield separated from the borehole VSP records, we obtain the Q model using the spectral ratio method. We then apply inverse Q filtering to a surface seismic dataset across the borehole using a stable inverse Q filtering method to improve the resolution of the surface seismic dataset. Correlating the corridor-stacked VSP seismic traces to surface seismic section before and after inverse Q filtering shows that the resolution of the surface seismic data and the matching of seismic events between the surface data and the VSP corridor stack are both significantly improved after the application of the VSP-derived inverse Q filtering.