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Abstract

Summary

The deep water field covered in this study is located approximately 200 km offshore Nigeria. To enable 4D interpretation over the full reservoir area, TotalEnergies Upstream Companies Nigeria acquired in 2017, prior to first oil production in December 2018, an ocean-bottom node (OBN) baseline (BL) survey. Acquisition of the first monitor (M1) survey took place in 2021. This case study describes how OBN-specific processing algorithms and associated 4D QCs overcame some acquisition challenges and delivered a high-fidelity 4D product to accurately interpret the reservoir changes. The 4D attributes show excellent repeatability with normalized root-mean-square values below 6%, low level of 4D noise and high resolution 4D signal. The 4D seismic data were of sufficient quality to enable elastic inversion and interpret the reservoir changes over the entire survey area.

Continuous monitoring via acquisition of new 4D surveys is planned for the next years. The project established 4D OBN workflows should facilitate standalone processing of the new vintages and therefore reduce the turnaround time between acquisition and interpretation of the results.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.202310313
2023-06-05
2026-01-13

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References

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/content/papers/10.3997/2214-4609.202310313
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Overcoming repeatability challenges: a time-lapse ocean-bottom node study offshore Nigeria
Conference Proceedings 2023, 1 (2023); https://doi.org/10.3997/2214-4609.202310313
/content/papers/10.3997/2214-4609.202310313
/content/papers/10.3997/2214-4609.202310313
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