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Abstract

Summary

The Nordkapp Basin is a large under-explored salt basin of the Barents Sea. Despite several exploration campaigns over the past decades, no successful drilling was achieved. A new hybrid survey combining streamers and nodes was acquired in 2021 to unlock this new play. Sparse nodes recording continuously during a 3 months period, with a nominal spacing of 1200m in both inline and crossline directions, supplemented a natively dense source over streamer data acquired with 7 simultaneous sources and 18 cables. We present here a fully data-driven FWI flow designed to exploit and combine the different types of data recorded by this survey to obtain optimal velocity model. The flow combines the ultra-low frequencies diving waves obtained from node interferometry and the ultra-wide offsets of node active seismic gathers to obtain a background velocity model for accurately imaging salt flanks. For higher frequency FWI, the streamers dataset with its dense spatial sampling including more near offsets traces complemented the sparse OBN data. The final 200Hz FWI product allows to directly distinguish in the velocity model the Carnian sands target and reveals details in shallow as small as 3 to 4m, which opens up new possibilities for hydrocarbon and shallow hazard detections.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.202310805
2023-06-05
2026-01-18

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References

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/content/papers/10.3997/2214-4609.202310805
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The road to 200Hz FWI using hybrid streamer and node acquisition over Nordkapp
Conference Proceedings 2023, 1 (2023); https://doi.org/10.3997/2214-4609.202310805
/content/papers/10.3997/2214-4609.202310805
/content/papers/10.3997/2214-4609.202310805
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