Research on the Pore Evolution of Sandstone in Cold Regions under Freeze-Thaw Weathering Cycles Based on NMR

Table 2

Average pore connectivity parameters calculated.

Freeze-thaw cycles	0	20	40	60	80	100	120
Porosity (%)	6.516	5.660	5.482	5.475	5.688	5.695	5.803
IFP (%)	2.681	2.845	2.841	2.706	2.623	2.364	2.313
MFP (%)	3.835	2.815	2.641	2.769	3.065	3.331	3.490
BVI (%)	41.147	50.269	51.827	49.432	46.116	41.503	39.859
FFI (%)	58.853	49.731	48.173	50.568	53.884	58.497	60.141
T2cutoff	4.4	4.2	3.74	3.2	2.77	2.4	2.13