Seismic inverse Q filtering for carbonate reservoir characterization

The Ordovician carbonate reservoir in Tahe oilfield, Tarim basin, is buried very deep with a depth being larger than 5000 m. The reservoir is featured by fracture-vuggies, and the formation has extremely strong heterogeneity in both the vertical and horizontal direction. These features lead to low signal-to-noise ratio and low resolution of the seismic reflection data, and in turn to the difficulty in characterization of carbonate reservoirs. Aiming at these problems, here we use a stabilized inverse-Q filter to process the three-dimensional (3D) seismic data in Tahe oilfield, conducting seismic amplitude compensation and waveform phase correction, simultaneously. Comparing the inverse-Q filtered result directly with the raw seismic data in terms of seismic profiling, interior information within the reservoir, characterization of faults and fracturevuggies, we demonstrate the advantages of stabilized inverse-Q filtering in enhancing seismic resolution, strengthening weak signals, and improving lateral continunity of reflections, and reveal that this method can improve the accuracy of fracture-vuggy characterization in the Ordovician carbonate reservoirs.