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

Table 3

Displacement efficiency under different displacement pressures.

Serial number	Lithology	Ф (%)	K (mD)	Oil displacement efficiency (%)
				0.34 MPa	0.68 MPa	1.36 MPa	2.7 MPa
4	Shale	8.9900	0.0075	0.9600	2.7700	7.4800	—
5	Shale	8.9000	0.0612	11.2300	12.2000	14.1900	15.1200
6	Tight sandstone	9.0000	0.0049	3.8700	6.1000	8.2000	13.7100