A New Method for Predicting the Permeability of Sandstone in Deep Reservoirs

Table 4

Relative error analysis of the predicted permeability of the five types of models.

Core no.	Swanson model relative error (%)	Improved Swanson model relative error (%)	Capillary parachor model relative error (%)	Improved capillary parachor model relative error (%)	SVR model relative error (%)
1	63.01	45.81	73.19	26.01	-1.06
2	-19.68	-6.74	-14.52	42.34	-6.50
3	64.00	85.77	-84.19	-55.71	-5.59
4	65.51	78.80	34.77	89.08	55.35
5	-3.12	-8.86	43.52	12.14	4.81
6	78.40	64.58	13.04	4.17	8.07
7	-27.12	-6.58	-65.67	-4.95	-2.06
8	-25.76	-6.37	157.41	309.19	41.66
9	-13.54	-21.21	25.64	-10.41	1.85
10	0.31	21.71	-15.95	69.96	14.44
11	-36.46	-35.28	-51.70	-42.54	-23.44
12	-14.43	-15.12	-28.10	-25.44	-18.76
13	128.96	162.02	38.17	148.91	27.52
14	45.28	49.58	-34.71	-9.32	0.16
15	-16.99	-12.05	-25.75	-5.46	4.29
16	-31.96	-28.79	2.27	9.08	-1.00
17	-25.10	-11.02	-90.71	-70.68	-46.15
18	123.83	151.04	-0.94	85.29	35.98
19	281.34	260.89	146.21	143.01	5.10
20	7.28	7.62	-0.69	2.72	1.73
21	-12.80	-12.69	10.82	6.12	5.16
22	15.69	30.27	-81.68	-54.80	-24.25