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

Table 2

Composition of Changqing oil samples.

Component	W1 oil (mol%)	W2 oil (mol%)	W3 oil (mol%)
N2	0.65	1.52	0.77
CO2	0.38	0.01	0.08
C1-C3	27.39	32.11	43.41
C4-C10	30.99	24.02	29.22
C11-C20	18.99	23.12	14.47
C21-C30	10.22	10.54	6.61
C31+	11.38	8.68	5.44