Asphaltene Deposition during CO₂ Flooding in Ultralow Permeability Reservoirs: A Case Study from Changqing Oil Field

Table 1

Four-component analysis of oil samples.

Four components	W1 oil	W2 oil	W3 oil
Asphaltene (wt%)	1.32	0.93	0.43
Resin (wt%)	8.59	7.75	5.57
Aromatic (wt%)	13.52	11.94	12.58
Saturate (wt%)	63.78	52.90	51.37
CII	2.94	2.73	2.85