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During the summer of 2004 an experimental OBS survey was acquired and processed by CGG over the Girassol field operated by Total Angola, offshore West Africa. Five ARMSS nodes (Autonomous Reservoir Monitoring Seismic System) were deployed in this area at a water depth of 1300 meters. The primary objective of this trial was to verify the operational sequence and performance of this new generation of 4C recording equipment. There were also a number of secondary objectives which were to benchmark the recorded data with a view to infilling the streamer acquisition in this difficult environment and to evaluate the added value of recording four components. In this paper, after a short description of the recording system and the acquisition layout, the results of the processing are compared with streamer data acquired previously in the same area. The 4D capabilities of the node technology are assessed. A comparison of the results proves that nodes could be used in infill areas to complement streamer data.

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