NMR Experimental Study on Dynamic Process of Pore Structure and Damage Mechanism of Sandstones with Different Grain Sizes under Acid Erosion

Table 2

Test parameters of the CPMG sequence.

System parameters	Value
Magnet temperature (°C)	32
SF (MHz)	12
O1 (Hz)	475258.8
RFD (ms)	0.002
P1 (μs)	16
P2 (μs)	33.04
TD	300038
TW (ms)	1500
RG1	10
DR	1
NS	16
NECH	3000