Experimental Study on the Oil Recovery Performance of CO₂ Huff-and-Puff Process in Fractured Tight Oil Reservoirs

Table 1

Basic properties of core samples.

Core no.	Type	Length (cm)	Porosity (%)		Permeability (mD)
			Before fracture	After fracture	Before fracture	After fracture
1	Fracture	5.014	11.86	12.35	1.56	1249.34
2	Fracture	5.776	11.40	11.74	1.94	896.21
3	Matrix	4.876	13.46	—	3.10	—
4	Matrix	5.028	13.61	—	3.02	—
5	Matrix	5.992	12.75	—	2.20	—