基于相控约束的西湖凹陷宽频地震盲反演方法OA

The Xihu Sag Block W in the East China Sea Shelf Basin contains extremely rich oil and gas resources and has good development prospects.However,there are few well locations in this area,with concentrated distribution and shallow drilling depths.Only a few wells penetrate the target formation.Therefore,a phase-controlled,constrained broadband seismic inversion method is considered to achieve reservoir prediction in this region.By processing seismic data to obtain broadband seismic data,extracting seismic blind wavelets using high-order cumulant correlation theory,and establishing an initial model that better conforms to geological characteristics through phase-controlled constraints,the final broadband seismic blind inversion results are obtained to indicate reservoir distribution characteristics.The study concludes:① In the absence of well data,traditional interpolation modeling methods struggle to accurately capture stratigraphic sedimentary changes and seismic facies differences,leading to uncertainties and errors in low-frequency models.In contrast,the low-frequency model construction method based on waveform constraints combines high-resolution logging data with seismic facies information,fully utilizing the spatial information in seismic data to more accurately reflect the sedimentary material changes in well-free areas,thereby improving the geological accuracy of low-frequency models.②When using the waveform-constrained modeling method for inversion,the results provide more accurate reservoir descriptions,clearly showing the top-bottom interfaces and internal change characteristics.Compared with conventional modeling methods,this method has stronger lateral recognition capabilities,especially in complex geological environments,where it can more effectively identify geological features with significant lateral variations and demonstrate greater adaptability.