Toward Quantitative CO
            <sub>2</sub>
            Monitoring at Sleipner, Norway

Romdhane, Anouar; Dupuy, Bastien; Querendez, Etor; Eliasson, Peder

doi:10.1002/9781119156871.ch22

Cited by 2 publications

(2 citation statements)

References 53 publications

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“…Seismic data are collected at different times and under varying conditions, such as changes in equipment, weather, or environmental factors. Calibration helps ensure that the data from different surveys are consistent and can be directly compared [26]. This enables trusted quantitative analysis since we aim to quantify the injected volume of CO 2 .…”

Section: Seismic Data Conditioningmentioning

confidence: 99%

CO2 Injection Monitoring: Enhancing Time-Lapse Seismic Inversion for Injected Volume Estimation in the Utsira Formation, Sleipner Field, North Sea

Pelemo-Daniels,

Nwafor,

Stewart

2023

JMSE

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This article presents an in-depth study of CO2 injection monitoring in the Sleipner Field, focusing on the Utsira Formation. The research leverages advanced time-lapse inversion techniques and 4D seismic data analysis to enhance the accuracy of volume estimations and provide a comprehensive understanding of the dynamic behavior of the injected CO2 plume. The analysis encompasses cross correlation, time shift, predictability, and other key elements to yield robust insights into the reservoir’s response to CO2 injection. Cross-correlation analysis results of 60% to 100% outside the injection zone and less than 50% within the injection zone reveal a distinct dissimilarity between the injection and non-injection zones, emphasizing phase, time, and frequency content changes due to CO2 injection. Time shifts are meticulously calibrated globally on a trace-by-trace basis, to account for shallow statics and velocity changes, improving the overall alignment of seismic data. Predictability analysis results of 0 to 0.34 within the injection zone and 0.45 to 0.96 at the background further reinforce the findings, highlighting high predictability values in areas untouched by production and markedly lower values within the injection zone. These results provide a measure of the reliability of the seismic data and its ability to reflect the subtle changes occurring in the reservoir. Crucially, the time-lapse inversion process excels in capturing the evolving state of the CO2 plume within the Utsira Formation. The seismic data reveals the migration and expansion of the plume over time and the dynamic nature of the reservoir’s response to CO2 injection. Integrating various data facets reduces non-uniqueness in inversion results, allowing for more precise volume estimations.

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Section: Seismic Data Conditioningmentioning

confidence: 99%

CO2 Injection Monitoring: Enhancing Time-Lapse Seismic Inversion for Injected Volume Estimation in the Utsira Formation, Sleipner Field, North Sea

Pelemo-Daniels,

Nwafor,

Stewart

2023

JMSE

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“…To obtain the changes in terms of rock physics properties, full‐waveform inversion (FWI) is employed to estimate

V_P

and in the next step, the estimated

V_P

is inverted using rock physics inversion. For example, this two‐step procedure has been used to estimate the changes in the saturation of CO 2 at the Sleipner field in the North Sea (Queißer & Singh, 2013; Dupuy et al., 2016; Dupuy et al., 2016; Yan et al., 2019; Dupuy et al., 2021; Romdhane et al., 2022).…”

Section: Introductionmentioning

confidence: 99%

Monitoring fluid saturation in reservoirs using time‐lapse full‐waveform inversion

Mardan

Giroux

Fabien‐Ouellet

et al. 2023

Geophysical Prospecting

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Monitoring the rock-physics properties of the subsurface is of great importance for reservoir management. For either oil and gas applications or CO 2 storage, seismic data are a valuable source of information for tracking changes in elastic properties which can be related to fluids saturation and pressure changes within the reservoir. Changes in elastic properties can be estimated with time-lapse full-waveform inversion. Monitoring rock-physics properties, such as saturation, with time-lapse full-waveform inversion is usually a two-step process: first, elastic properties are estimated with full-waveform inversion, then, the rock-physics properties are estimated with rock-physics inversion. However, multiparameter time-lapse full-waveform inversion is prone to crosstalk between parameter classes across different vintages. This leads to leakage from one parameter class to another, which, in turn, can introduce large errors in the estimated rock-physics parameters. To avoid inaccuracies caused by crosstalk and the two-step inversion strategy, we reformulate time-lapse full-waveform inversion to estimate directly the changes in the rock-physics properties. Using Gassmann's model, we adopt a new parameterization containing porosity, clay content, and water saturation. In the context of reservoir monitoring, changes are assumed to be induced by fluid substitution only. The porosity and clay content can thus be kept constant during time-lapse inversion. We compare this parameterization with the usual density-velocity parameterization for different benchmark models. Results indicate that the proposed parameterization eliminates crosstalk between parameters of different vintages, leading to more accurate estimation of saturation changes. We also show that using the parameterization based on porosity, clay content, and water saturation, the elastic changes can be monitored more accurately.Keywords full-waveform inversion • CO 2 monitoring • time-lapse inversion • reservoir monitoring • rock-physics monitoring

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Toward Quantitative CO ₂ Monitoring at Sleipner, Norway

Cited by 2 publications

References 53 publications

CO2 Injection Monitoring: Enhancing Time-Lapse Seismic Inversion for Injected Volume Estimation in the Utsira Formation, Sleipner Field, North Sea

CO2 Injection Monitoring: Enhancing Time-Lapse Seismic Inversion for Injected Volume Estimation in the Utsira Formation, Sleipner Field, North Sea

Monitoring fluid saturation in reservoirs using time‐lapse full‐waveform inversion

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Toward Quantitative CO 2 Monitoring at Sleipner, Norway

Cited by 2 publications

References 53 publications

CO2 Injection Monitoring: Enhancing Time-Lapse Seismic Inversion for Injected Volume Estimation in the Utsira Formation, Sleipner Field, North Sea

CO2 Injection Monitoring: Enhancing Time-Lapse Seismic Inversion for Injected Volume Estimation in the Utsira Formation, Sleipner Field, North Sea

Monitoring fluid saturation in reservoirs using time‐lapse full‐waveform inversion

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Toward Quantitative CO ₂ Monitoring at Sleipner, Norway