陆上宽频采集叠后地震资料的小波域提高分辨率应用研究

Improving the resolution of seismic data while maintaining its SNR and amplitude is a pertinent research topic in seismic data processing and interpretation.This study analyzes the spectral characteristics of broadband post-stack seismic data and introduces the method to expand the frequency spectrum bandwidth adaptively for seismic data in continuous wavelet domain.We indicate the detailed implementation steps, the selection criterion for high/low reference frequencies, and the bandwidth extending strategy.This method was applied to two 3D post-stack broadband seismic datasets from different regions of the Junggar Basin in the Xinjiang oilfield.The cross-well imaging profiles and its corresponding multi-channel normalized average amplitude spectra near the target layer before and after the application of this method are compared and analyzed.The comparison results demonstrate that this method can extend the high frequency information of 3D post-stack migrated broadband seismic data.Thus, the contact relationship of seismic reflections is more obvious, fracture characteristics are improved, and spatial distribution of the sand layer group is easier to discern, which assists in identifying the trap boundaries.The method can also help maintain low frequency effective signals and achieve high SNR.