Integration of NMR and NMRC in the Investigation of the Pore Size Distribution of Tight Sandstone Reservoirs: A Case Study in the Upper Paleozoic of Dongpu Depression

Table 2

Petrophysical parameters and results of FESEM image extracted by PCAS.

Sample	Reservoir types	Helium porosity (%)	Gas permeability (mD)	Region percentage (%)	Pore numbers/mm^2	Average form factor	Probability entropy
1	Type I	7.21	0.0997	7.62	2652	0.5812	0.7384
2	Type I	8.85	0.409	8.56	3089	0.6147	0.7926
3	Type I	7.81	0.332	/	/	/	/
4	Type I	7.63	0.188	/	/	/	/
6	Type II	5.93	0.0803	/	/	/	/
7	Type II	4.29	0.0601	5.03	3681	0.5093	0.8813
10	Type II	6.19	0.043	7.49	4174	0.4855	0.8601
8	Type III	3.72	0.0479	2.08	1725	0.5122	0.9904
5	Type III	4.36	0.0426	/	/	/	/
9	Type IV	3.16	0.0438	/	/	/	/
11	Type IV	2.13	0.0309	0.46	472	0.4537	0.9913
12	Type IV	2.63	0.0245	0.82	589	0.4662	0.9885