Reservoir Simulation - CO2 Sequestration
1. Whether Local Capillary Trapping (LCT) associated with small-scale reservoir heterogeneity critically dictate the storage capacity of a given deep saline aquifer?
If so, is it correlated linearly or non-linearly with the velocity and extent of CO2 plume migration?
2. Feasible to employ very fine grid blocks in the ranges of ‘milli-m to deci-m’ scale - in order to capture such small-scale heterogeneity (LCT) under reduced flow rate of CO2 - through a highly heterogeneous deep saline aquifer (so that up-scaling would remain meaningful)?
3. How confidently will we be able to assign the value of critical CO2 saturation to fine/coarse field-scale simulation cells – in order to precisely capture the dynamic storage capacity of CO2?
4. Albeit CO2 rises within the aquifer through buoyancy, how will we ensure that CO2 enters the deep saline aquifer through a planar source at the bottom?
5. If the top of the aquifer has a significant leakage, then, will we be able to reach the so called percolation threshold at all?
How will the assumption of closed boundaries on all sides would really help to solve such problems?
6. How critical would the cell width remain – in dictating the complex non-linear relationship between grain-size distribution (with significant variance) and buoyant flow saturation of CO2?
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