CO₂ plume map on your core plugs

One end-to-end run: plume size, up-dip migration, brine re-entry and trapped CO₂ (the trapping calculator model), plus pressure rise during injection and fall-off after.

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Core plugPentland 2011 is left out: its paper gives no permeability or porosity.Years after injection stops: 20Reservoir temperature: 122 °FReservoir pressure: 1,305 psi

Trapped CO₂

563,636 t

Still mobile

436,364 t

Brine re-entry

100.0 %

Peak well pressure rise

60 psi

Dashed: plume when injection stops. Shaded: mobile CO₂ now. Hatched: swept by returning brine — CO₂ left there is trapped. The plume has moved past its starting outline; brine has re-entered all of it.

Pressure rise above starting reservoir pressure. Solid: at the well. Dashed: 1 mile out. Blue line: the time you picked.

Plume radius 1,778 ft, moved 122,541 ft up-dip, CO₂ density 292.4 kg/m³. Pressure rise at the well now: 1 psi.

From the plug: porosity, permeability, initial and residual CO₂ saturation (Krevor et al. 2012, WRR 48 W02532, doi:10.1029/2011WR010859 (tables)). Leftover brine = 1 − initial CO₂ saturation; trapping curve fitted to this plug alone (Land 1968).

My starting values, not your data: 1 Mt injected over 10 years, 5,000 acres, 100 ft thick, 2° dip, brine 1,050 kg/m³, brine viscosity 0.5 cp, total compressibility 1e-5 1/psi. Start T/p is the lab test (50 °C, 9 MPa).

Pressure: Theis (1935) line source in brine with shut-in superposition, at the wellbore (0.354 ft) and 1 mile out. Treats the reservoir as infinite and single-phase brine — no boundaries, no CO₂ relative-permeability effect on injectivity.

Map: distances to scale; plume drawn as a circle sliding up-dip (screening geometry, not a simulated shape).