Multi-Azimuth Processing of Offshore 3D Seismic Data

Two different conventional 3D offshore seismic surveys have been carried out at different time over the interested poten-tial plays with difficult geological purposes. But it is very difficult for well data to map on seismic data, just under the conditions of complicated geology such as shallow carbonates, some zones of cementation, incised valleys, graben where there are salt diapirs and the low reflectivity reservoir and so on. Therefore, as a nonconventional processing method, multi-Azimuth (MAZ) 3D seismic data processing was introduced. Following performance of data regularization, matching and depth velocity model building of orthorhom-bic anisotropy, the module MAZ stack was used to compute weighted stacks based on cross-correlation with pilot stack. MAZ processing data result in wider frequency range, higher ratio of S/N and better imaging especially for faults. However, it is expected to further enhance the imaging quality in the area with low reflectivity beneath the graben.