Counter-current spontaneous imbibition (CCSI) is a key mechanism for tight oil development. Most studies focus on the impact of fluid and rock properties on CCSI, rarely considering the adverse effects of increased resistance to oil flow once water occupies the oil flow space. We used the color gradient model of the lattice Boltzmann method to simulate CCSI in Jimsar tight cores, obtaining the normalized oil channel area at the matrix outlet and the recovery. Additionally, we employed the water-solid conversion method to characterize permeability damage during the imbibition process. The study found that the normalized oil channel area and recovery are highly sensitive to changes in the contact angle, whereas the effect of interfacial tension is relatively minor. The recovery increases as the contact angle decreases, but the normalized permeability of oil first increases and then decreases. There exists an optimal contact angle of 30°, which allows for achieving higher recovery while maintaining the oil phase’s flow resistance at a lower level.