A new concept of sequestering CO 2 based on physical property differences was proposed, and its feasibility, mechanism, and effectiveness were demonstrated through experiments and numerical simulation of a low‐permeability depleted oil reservoir. First, the CO 2 flowing rule in strong heterogeneity and confirmed sandstone was revealed that significant petrophysics differences can effectively block the CO 2 seepage from the high‐permeability zone to the low‐permeability zone. Then, a mathematical model and a 3D geological model for CO 2 storage in low‐permeability sandstone depleted oil reservoirs were established, considering the three‐phase fluids of oil, gas, and water in the pores. The seepage laws of different fluids in the rock pore during CO 2 injection were simulated, and the minimum permeability range necessary for safe carbon dioxide storage was determined. Finally, using the Heidimiao Reservoir as an example, the applicability of the method was verified, and the efficiency of CO 2 storage in depleted low‐permeability reservoirs was simulated. The simulation results demonstrated that good results can be achieved by selecting a reservoir dessert area with a notably petrophysical boundary for CO 2 storage. Within the effective storage period, the escape of the trapped CO 2 was not substantial, and the storage area remained relatively stable.
Li et al. (Wed,) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: