Deep Water Sparse OBN Surveys - Processing Flow and QC

In this paper we are describing the processing flow for deep water sparse node OBN processing. The processing steps which are unique to OBN processing are discussed in details. Some of the steps in the processing handles variations which are not repeatable between surveys and taking out the variations are important not only for imaging of single surveys, but also for limiting the 4D noise in OBN results. The different methods for QC-ing OBN processing results are discussed as well as the effect of the datum difference on how to QC the data. The OBN processing delivers two independent datasets and images of the sub-surface, the up-going and down-going which are used together in velocity model building as well as for interpretation.