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How Fluid Miscibility Impacts 4D Seismic Signal in Conventional or CO2 Storage Reservoir?
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 86th EAGE Annual Conference & Exhibition, Jun 2025, Volume 2025, p.1 - 5
Abstract
Summary
During Enhanced Oil Recovery (EOR) or Water Alternating Gas (WAG) operations, the fluid miscibility impacts the 4D seismic signal by altering the acoustic properties of the reservoir rocks. This requires specific modeling to account for miscibility, as the conventional black oil model is too simplistic to render the compositional mass transfer mechanism occurring in the pore where the reservoir fluid mixes with the injected fluid.
This paper also highlights the importance of using a compositional fluid flow simulation for high miscibility conditions, as it provides petroelastic modeling results significantly different from the simplistic computation. The quantitative evaluation between the standard black oil model and the compositional approach is illustrated on a WAG study, showing differences in the 4D seismic attributes. The reliable evaluation of fluid properties is mandatory for relevant feasibility studies and quantitative interpretation of 4D seismic attributes.
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