This paper discusses the workflow for high-resolution model building and imaging of a broadband multimeasurement towed streamer survey over the Mariner field in the North Sea. The model-building strategy combines the complementary techniques of full waveform inversion (FWI) and reflection tomography to generate an accurate, high resolution and geologically consistent velocity model, using both refraction and reflection energy. The 3D deghosted and reconstructed wavefield generated by the generalized matching pursuit (GMP) algorithm is densely sampled in all directions, and provides the ideal input for imaging techniques such as Kirchhoff prestack depth migration (KDM) and high-frequency reverse time migration (RTM). The combination of such a high resolution earth model and broadband, densely sampled input data provides the significant benefits for both overburden and reservoir characterization in this setting.