Table 8 General performance for the different ML models for both single and multi-output targets.

	MR	LR	RG	RF	GB	SMR-ML	SMR-NN
Single-output (porosity)
R²	0.52	0.52	0.48	0.99	0.99	0.99	0.99
MAE	0.08	0.08	0.09	0.0003	0.0004	0.0012	0.0015
C. Time (min)	0.1	0.01	0.001	2.1	9.6	55.6	4.8
Single-output (permeability [mD])
R²	0.28	0.28	0.25	0.99	0.99	0.99	0.95
MAE	1.13	1.14	1.20	0.0023	0.0003	0.0002	0.012
C. Time (min)	0.4	0.05	0.001	2.3	95.7	229.4	4.5
Multi-output (porosity and permeability [mD])
R²	0.39	0.39	0.39	0.93	0.92	0.93	0.96
Test_MAE	0.61	0.61	0.61	0.11	0.09	0.11	0.02
C. Time (min)	0.3	0.6	0.001	0.2	8.5	10.0	12.1

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