Static dissolution-induced 3D pore network modification and its impact on critical pore attributes of carbonate rocks

ANDRIAMIHAJA Spariharijaona,PADMANABHAN Eswaran,BEN-AWUAH Joel,SOKKALINGAM Rajalingam

Table 2 Pore network model variation induced by dissolution at various temperatures.

Rock type Sample and temperature Experimental condition Measured porosity/% Pore number Pore size/mm Pore throat number Average pore throat radius/mm Average pore throat length/mm Coordination number Absolute permeability/ 10-3 μm2 Type 1 rock M1, 25 °C Before dissolution 1.70 801 0.18 411 0.022 0.27 4.2 13.04 After dissolution 5.20 564 0.24 291 0.030 0.37 5.3 50.00 M2, 50 °C Before dissolution 0.11 25 0.21 9 0.049 0.53 1.0 4.16 After dissolution 0.43 13 0.32 6 0.065 0.65 2.9 17.75 M3, 75 °C Before dissolution 0.23 794 0.24 313 0.035 0.38 1.2 2.50 After dissolution 1.06 274 0.26 88 0.050 0.52 2.2 9.45 Type 2 rock B1, 25 °C Before dissolution 8.07 4 139 0.10 792 0.026 0.23 3.0 751.53 After dissolution 12.70 1 637 0.18 515 0.036 0.33 4.4 950.00 B2, 50 °C Before dissolution 6.80 1 604 0.19 348 0.052 0.51 2.7 843.40 After dissolution 10.80 875 0.30 195 0.055 0.56 4.0 2 358.30 B3, 75 °C Before dissolution 8.01 1 588 0.12 691 0.015 0.18 4.9 1 638.50 After dissolution 22.34 1 035 0.23 321 0.053 0.53 7.9 5 556.50