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Time-Lapse Seismic Inversion for Quantitative Matrix and Fluid Estimation in Sleipner Field
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, The Fourth EAGE Global Energy Transition Conference and Exhibition, Nov 2023, Volume 2023, p.1 - 5
Abstract
Summary
The CCS allows to reduce the CO2 emissions while preserving competitive industries, however, it needs to be well-monitored to mitigate risks and maintain control over the expected CO2 accumulation. The present article has provided valuable comprehension of the CO2 plume evolution in the Sleipner storage site. The proposed workflow allows to quantitatively estimate matrix and fluid properties in the Utsira formation. The work sequence is as follows: sequential inversions of the vintages, modeling of the time-scaling laws to the base vintage, matrix characterization based on pre-injection seismic data, and fluid estimation, based on Gassmann equation using all vintages.
The saturation estimation is monotonically increasing with the relative impedance anomaly but manifests high nonlinearity. As a result, even a small saturation may induce a significantly large anomaly. The seismic quantification of the saturation is a success. Indeed, the calculated CO2 mass, closely aligns with the injected CO2, with a satisfying 10% of underestimation, which can be either due to partial dissolution or to the seismic resolution limitation. Furthermore, the CO2 volume maps indicate that, from 2004 to nowadays, the accumulation is mostly located within the trap inferred by the depth structural map of Utsira formation.
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