Assessment of CO2 residual trapping in depleted reservoirs used for geosequestration

摘要: Abstract Carbon capture and sequestration technology is a major approach developed to mitigate the amount of greenhouse gases released into atmosphere. Technically, depleted oil gas reservoirs are one feasible subsurface geologic media for large-scale carbon dioxide (CO2) storages. Trapping mechanisms during after CO2 injection in formations ensure long-term safety security storage task. However, depending on characteristics sites conditions, different trapping may come play sequestration, among which residual by far most efficient short-term scale. Although there have been many experimental numerical studies carried out past years evaluate this potential prior injection, not any field-scale approaches assess at depletion stage reservoirs. The aim paper present method assessment considering related effective constraints such as hydrocarbon saturation, interfacial tension, pore geometry, wettability. An analytical based adjustment factor was proposed could be used determine saturation/residual rock types having wetting characteristics. Two wells total number 20 (mostly depleted) from largest field Malaysia were considered part study show how can executed scale determination ability reservoir. results obtained indicated that average saturation around 26% 27% Well A B, respectively. Thus, maximum volume trapped approximately 0.96 Tscf or 0.97 (excluding 30% Sgr), saturations estimated data B. validated both experimentally numerically where it found three phase core flooding good agreement, indicating strongly water wet system. more samples taken same required further validate before fully implementing site.