OVT Domain Processing Technique and Application in Shale Oil Exploration in the Southern Songliao Basin: A Case Study of the H Well Area

With the continuous advancement of seismic exploration and the increasing demand for imaging accuracy, wide-azimuth seismic exploration has emerged as a trend in seismic exploration technology. The wide-azimuth vector offset (OVT) seismic processing method is a novel azimuth processing technique that primarily encompasses the extraction of OVT gathers, data regularization, pre-stack time migration in the OVT domain, and azimuthal anisotropy correction. This method can preserve the true amplitude and azimuthal information in pre-stack gathers and correct anisotropy errors arising from wide-azimuth acquisition, thereby enhancing illumination effects for complex geological structures. Through an analysis of the application effects in the 3D seismic processing of the H well area, the processing technique based on the OVT domain can fully leverage the advantages of wide-azimuth seismic data. By utilizing pre-stack gathers alongside azimuthal and frequency-division post-stack depth migration results, qualitative fracture prediction can be conducted.