Regarding the cost of the CCUS chain, many studies have focused on the specific technical and economic evaluations of CCUS. CCUS demonstration projects launched in China have demonstrated that economic feasibility has become a substitute for technical feasibility and is the main obstacle to the large-scale industrialization of CCUS technology [
21]. Zhang et al. [
24] evaluated the investment in CCS (carbon capture and storage) retrofitting for two typical types of power plants from the perspective of power generation enterprises. Their results indicate that a large gap exists between the carbon price needed for CCS retrofitting of both typical types of power plants and the current prices on the voluntary emission reduction market. Selosse and Ricci [
15] investigated various scenarios with different carbon storage potentials and examined the impact of an increase in carbon transport costs on CCS development. Durmaz [
3] employed a simple energy generation model, scrutinized the economic drivers of CCS based on the analytical results, and discussed the possible obstacles that could prevent the widespread implementation of the technology. Lin and Tan [
13] proposed a deferred option model to quantitatively evaluate the impacts of low oil price shocks and the carbon trading mechanism on CCUS-enhanced oil recovery (EOR) project investments based on real options theory. They found that the current economic environment is not sufficient to trigger immediate investment in CCUS projects, but the introduction of a carbon trading mechanism could significantly improve the investment value of such a project and reduce the probability of investment failure. As a value-adding benefit, CO
2 injected into a mature oil reservoir can enable incremental oil to be recovered. Typically, CO
2 flooding allows the recovery of an additional 10-15% of the original oil in place (OOIP) (2010). CO
2-EOR is currently one technique being considered as an ultimate long-term geological storage solution for CO
2 owing to its economic profitability, i.e., the incremental oil production offsets the cost of the carbon sequestration [
19]. Fleten et al. [
6] used a traditional dynamic programming approach to investigate the profitability of several value chains for large CO
2 producers. Their main conclusion is that CO
2-EOR will result in a situation more profitable than venting the CO
2 or investing and in CCS alone. The oil revenues from EOR are the main driver of CCS + EOR implementation.