Regularization of Simultaneous Long Offset Data Acquired Offshore Gabon - A Case Study

The case study investigates the applicability of certain processing steps to a simultaneous long offset acquisition configuration using a data set acquired offshore Gabon. This acquisition configuration is a two vessels operation using relatively short streamers and a simultaneous shooting scheme. One of the main operational advantages is that tangling risks and feathering are reduced compared to towing (12km) long streamers. The simultaneously acquired shots can be deblended with an inversion approach to obtain separate near and far offset data sets. The data are then regularized using an anti-leakage Fourier transform method with an additional anti-aliasing algorithm. Regularization is done in 4-D tackling irregularities in midpoint position and offset. It is demonstrated that processing steps (such as Radon demultiple) that benefit from continuous CMPs can then be applied directly afterwards without any limitations. The combination of simultaneous long offset acquisition and regularization in processing can help to reveal structural and stratigraphic challenging deep targets of complex geology such as the salt morphology offshore Gabon.