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In 2017 a conventional narrow azimuth (NAZ) streamerto-streamer 4D was planned to cover just 2 fields in the Campos Basin of Brazil. It was observed that the 4D shots would also cover a sizable portion of another field which has a Life of Field Seismic (LoFS) ocean bottom cable system. The survey was expanded to take advantage of the fact that the LoFS field could be switched on to record seismic from these shots thereby acquiring a “snapshot.” This streamer-to-streamer 4D resulted in one of Shell’s best ratio of repeatability to date. As well, we saw that using the sparser streamer shots with the LoFS system provided similar quality results as the dedicated LoFS monitors. From this work we have learned that there can be significant savings in the future by reducing the amount of shots. In all, 65% less shots are needed to image clear 4D signal on the LoFS field. Advances in processing techniques also make this work possible, not only the improvements in streamer-tostream 4D, but the techniques required to use shots from a non-dedicated 4D survey.

A conventional 4D and a snapshot 4D comparison in the Campos Basin