1887

Abstract

Summary

Time-lapse gravity and seafloor deformation surveys offer a cost-effective alternative to 4D seismic for offshore reservoir monitoring, particularly in carbon capture and storage (CCS) projects. This technique has been widely adopted in Norway’s major gas fields and other global locations. It is especially valuable for monitoring depleted gas reservoirs where CO injection produces weak 4D seismic signals due to minimal changes in elastic properties. In such settings, time-lapse gravimetry and deformation measurements can accurately track CO mass distribution and pressure changes, as demonstrated in feasibility studies for the Morecambe and Viking CCS projects. At Morecambe, gravity signals well above the detection threshold will allow mapping of the CO plume and identification of potential migration. Similarly, modelling for the Viking project showed that gravity anomalies could detect plume shape and reservoir compartmentalization. In 2025, the deployment of this technology was further enhanced with the introduction of unmanned Reach Remote vessels, capable of operating ROVs from shore. This advancement reduces operational costs and health, safety, and environmental risks. Together, these developments position time-lapse gravity and deformation monitoring as a key MMV tool in CCS, supporting conformance, containment, and early warning of migration events.

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/content/papers/10.3997/2214-4609.202521047
2025-10-27
2026-01-17

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References

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/content/papers/10.3997/2214-4609.202521047
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Unmanned Time-Lapse Gravity and Seafloor Deformation Surveys as an Alternative to Costly 4D Seismic for CCS
Conference Proceedings 2025, 1 (2025); https://doi.org/10.3997/2214-4609.202521047
/content/papers/10.3997/2214-4609.202521047
/content/papers/10.3997/2214-4609.202521047
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