Characteristics of Hydration Damage and Its Influence on Permeability of Lamellar Shale Oil Reservoirs in Ordos Basin

Table 1

The influence of lithology, structure, sampling angle, fluid environment, and soaking time on permeability.

No.	Lithology	Structure	Sampling angle (°)	Soaking fluid	Permeability after soaking (mD)
					0 h	12 h	24 h	36 h	48 h
1	Shale	Lamellar structure	0	Water	4.27	6.93	7.08	7.15	7.15
2				WBDF	3.67	4.55	5.12	5.20	5.18
3			45	Water	1.98	2.57	2.67	2.83	2.83
4				WBDF	1.56	2.01	2.12	2.22	2.19
5			90	Water	0.51	0.57	0.61	0.67	0.61
6				WBDF	0.33	0.36	0.37	0.39	0.38
7		Bedding structure	0	Water	1.48	1.51	1.64	1.70	1.71
8				WBDF	1.41	1.47	1.56	1.54	1.55
9			45	Water	1.14	1.21	1.25	1.24	1.26
10				WBDF	0.77	0.79	0.87	0.85	0.85
11			90	Water	0.36	0.39	0.39	0.39	0.40
12				WBDF	0.29	0.30	0.31	0.32	0.32
13	Tuff	Lamellar structure	0	Water	3.61	4.99	5.27	5.29	5.31
14				WBDF	3.71	4.49	4.67	4.61	4.65
15			45	Water	1.77	2.33	2.51	2.54	2.57
16				WBDF	2.24	2.91	2.87	2.89	2.97
17			90	Water	0.67	0.73	0.75	0.79	0.76
18				WBDF	0.65	0.69	0.71	0.70	0.71
19		Bedding structure	0	Water	0.89	1.09	1.20	1.23	1.24
20				WBDF	0.91	0.98	0.95	0.97	0.99
21			45	Water	0.51	0.56	0.58	0.59	0.60
22				WBDF	0.69	0.72	0.75	0.76	0.75
23			90	Water	0.45	0.49	0.51	0.52	0.53
24				WBDF	0.55	0.59	0.58	0.59	0.60