Study on the Law of Membrane Efficiency of Unsaturated Shale and Its Application

Table 3

Water-absorbing capacity by chemical osmosis of reservoir shale.

Layer	Grain density kg/m^3	Porosity %	Initial water saturation %	Clay content %	CEC meq/100 g	Initial membrane efficiency	Saturated membrane efficiency	Water-absorbing capacity by chemical osmosis
⑨	2766	3.59	55.20	52.26	11.28	0.4881	0.2414	0.1577
⑧	2762	4.66	52.01	53.10	12.15	0.4314	0.1687	0.1351
⑦	2754	2.97	51.75	39.70	9.02	0.5018	0.2296	0.1689
⑥	2742	3.09	51.14	39.83	9.14	0.4934	0.2170	0.1654
⑤	2717	3.99	42.70	39.56	9.43	0.4679	0.1335	0.1544
④	2712	3.26	41.55	31.82	7.41	0.4661	0.1239	0.1527
③	2645	3.20	36.20	27.29	6.47	0.4647	0.0858	0.1457
②	2618	3.02	30.37	23.40	5.85	0.5139	0.0731	0.1615
①	2631	3.69	27.85	32.20	7.75	0.5766	0.0922	0.1954