Study on the Flow Mechanism of Shale Oil with Different Injection Media

Table 4

Contribution of pores with different relaxation times to oil displacement efficiency (%).

Serial number	Lithology	Relaxation time (ms)	Contribution of pores with different relaxation times to oil displacement efficiency (%)
			0.34 MPa	0.68 MPa	1.36 MPa	2.72 MPa
4	Shale	<10	41.72	13.97	10.76	—
		10∼100	21.76	30.22	32.82	—
		>100	37.12	55.81	56.42	—
5	Shale	<10	26.73	10.48	6.40	1.61
		10∼100	15.48	20.87	23.71	27.73
		>100	57.79	68.65	69.89	70.66
6	Tight sandstone	<10	34.67	29.32	22.72	20.46
		10∼10	18.55	26.35	36.86	46.35
		>100	46.78	44.33	40.42	33.19