Experimental Study on the Damage and Degradation Characteristics of Red Sandstone after Dry and Wet Cycling by Low Magnetic Field Nuclear Magnetic Resonance (NMR) Technique

Table 2

spectral areas of red sandstone after different wet and dry cycles.

Cycle-index rock-sample	total spectrum area					spectrum small to medium pore area					spectrum macropore area
	0	1	3	6	10	0	1	3	6	10	0	1	3	6	10
1	6.538	5.676	5.927	6.409	5.389	2.185	2.152	2.264	2.203	2.734	4.353	3.524	3.664	4.206	4.514
2	6.704	4.963	5.957	6.306	7.185	2.194	2.141	2.597	2.634	2.177	4.509	2.822	3.358	3.672	3.148
Average	6.621	5.320	5.942	6.358	6.287	2.190	2.147	2.431	2.419	2.456	4.431	3.173	3.511	3.939	3.831
Proportion/%						33.077	40.357	40.912	38.047	39.065	66.923	59.643	59.088	61.953	60.935