Five dimensional(5D)seismic interpretation plays an important role in fracture prediction and fluid identification.Gather quality is the basis of 5D interpretation.To address the issues of anisotropic moveout,low dominant frequency,and low signal-to-noiseratio,a portfolio of techniques,including gather denoising,resolution enhancement,residual moveout correction,azimuth gather conditioning,and high-precision well-tie calibration,are established for 5D high-resolution gather conditioning to improve the resolution,signal-to-noise ratio,and fidelity of 5D gathers.As per the case study of OVT data processing in Niuzhuang area,the Bohai Bay Basin in eastern China,stacked sections show seismic reflections with improved continuity and resolution and clear stra-tigraphic contacts.Dominant frequency increased from 25 to 43 Hz;effective bandwidth expanded from 8～51 to 6～74 Hz;correla-tion coefficient of well-tie calibration increased from 0.75 to 0.90.Sands of 43.8 km2 were predicted for the deployment of 3 drilling sites and reserves promotion.The workflow and techniques of 5D high-resolution gather conditioning add value to 5D seismic data for subsequent prestack inversion,fracture detection,and reservoir characterization.
维普
万方数据
