A Method of Inverting Rock Grain Size Based on Nuclear Magnetic Resonance Logging Data and Application

Table 1

Basic data of experimental cores.

No.	Porosity (%)	Permeability (mD)	Lith	No.	Porosity (%)	Permeability (mD)	Lith	No.	Porosity (%)	Permeability (mD)	Lith
1	18.1	37.00	Silty fine sandstone	15	18.7	1.76	Siltstone	29	19.6	16.60	Silty fine sandstone
2	15.8	0.11	Argillaceous siltstone	16	19.9	2.32	Silty fine sandstone	30	20.4	2.07	Siltstone
3	18.1	1.38	Silty fine sandstone	17	20.3	6.39	Silty fine sandstone	31	19.5	2.52	Siltstone
4	11.4	0.03	Argillaceous siltstone	18	19.3	2.32	Fine sandstone	32	20.5	6.14	Fine sandstone
5	17.4	2.72	Siltstone	19	20.4	4.79	Fine sandstone	33	20.7	8.18	Fine sandstone
6	21.2	121.00	Silty fine sandstone	20	17.0	0.13	Siltstone	34	20.1	2.86	Fine sandstone
7	21.8	186.00	Silty fine sandstone	21	16.3	0.16	Siltstone	35	20.1	2.49	Fine sandstone
8	19.3	93.60	Siltstone	22	11.5	0.10	Argillaceous siltstone	36	19.5	29.90	Fine sandstone
9	20.5	122.00	Silty fine sandstone	23	17.3	0.20	Siltstone	37	20.2	11.60	Silty fine sandstone
10	19.9	110.00	Silty fine sandstone	24	14.7	0.12	Argillaceous siltstone	38	20.1	15.50	Silty fine sandstone
11	17.5	11.70	Siltstone	25	19.5	15.20	Silty fine sandstone	39	19.9	10.00	Silty fine sandstone
12	20.2	2.03	Fine sandstone	26	19.7	16.70	Fine sandstone	40	19.7	3.83	Siltstone
13	18.8	1.62	Silty fine sandstone	27	20.1	19.90	Silty fine sandstone	41	19.7	3.96	Siltstone
14	14.5	0.13	Argillaceous siltstone	28	19.3	12.90	Silty fine sandstone