Seismic Resolution Enhancement for the Characterization of Tight-sand Gas Reservoirs

This is a case study on the application of inverse-Q filtering to improve the resolution of 3D seismic data, for the characterization of tight-sand gas reservoirs. Stabilized inverse-Q filtering is able to simultaneously compensate the amplitude and correct the phase of seismic waveforms. After processing, the frequency bandwidth has been increased and the width of the wavelet has been narrowed, so that we are able to identify reflections of thin sand layers clearly. Because of the high signal-to-noise ratio with the stabilization scheme, low-amplitude zones of interest corresponding to target high-fracture areas can be easily identified, and the detail within the anomalies can also be observed. Finally, spatial variations of tight-sand layers are depicted in the inversion profile with high resolution.