A case study of TORT Q imaging of OBN data in a highly faulted area

In Ocean Bottom Node (OBN) wide-azimuth seismic data, especially in fracture-developed areas, challenges such as significant azimuthal anisotropy and insufficient accuracy in velocity model building persist. Traditional streamer seismic data, due to limited azimuthal coverage, is difficult to accurately characterize complex velocity models. Taking the WX area as an example, there are some difficulties in delineating low-order faults, uncertainties in fault combinations, velocity variations caused by deep-seated major faults, and imaging requirements for thin reservoirs. This paper is aimed to optimize velocity based on tilted orthorhombic anisotropic (TORT) model building and propose a technique that combines pre-stack depth migration and Q-compensation (TORT Q-PSDM). The focuses are on velocity model building and PSDM for OBN wide-azimuth data in complex fault areas and the application workflow. Results demonstrate that the workflow significantly improves imaging accuracy for complex fault systems, providing a reliable basis for subsequent exploration and development.